Author Topic: WR250Z 1998 "the old lady" :)  (Read 7134 times)

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Offline Wujocaza

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WR250Z 1998 "the old lady" :)
« on: June 07, 2015, 08:16:27 AM »
Hello guys :D
I'm already introduce myself so it's time to introduce my old lady ;) It's Wr250Z from 1998. I've bought her about one year ago. She was very neglected. Some people were just riding and don't make any maitence. Bash plate was ripped off,the piston cracked and destroy a crankcase,nicasil were destroyed too,the exhaust pipe is from YZ not WR so it's barely fit and probably cousing all my problems with foulded spark plugs :(
She still need a lot of work, but so far what I have to do is :
-rebuild top end (new piston,sleeve,etc) ;
-change all the sealing in engine,and some bearings;
-i've fixed my problem with the exhaust valve;
-i've put new tires,new chain and sprockets;
-new brake pads;
-new handguards
And that's all what i want to write.It's not very much :P
And i'm deeply sorry for my englisch,but i'm trying my best to be better :)

Offline 4V5

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Re: WR250Z 1998 "the old lady" :)
« Reply #1 on: June 07, 2015, 09:48:51 AM »
Welcome to the forum!! awesome bike and great work saving it!

And i'm deeply sorry for my englisch,but i'm trying my best to be better :)

All good!! Reads better than some that only know how to do English  ;)
IT465x4 IT400C IT175F YZ465G YZ250C YZ250WR XJ650G RD350LC RD250LCx5 DT175Nx3 TW200x2 DT200L DT200R RT3 RX100G GT80F YZ80L PW50J KH250B1 KZ250D1 PE175C TS250ER TS185ER AG175B AG100

Offline glen4

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Re: WR250Z 1998 "the old lady" :)
« Reply #2 on: June 07, 2015, 05:25:41 PM »
Mate, that looks pretty tidy, mine was worse than that, but turned out nice with a bit of love


Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #3 on: June 08, 2015, 02:40:36 AM »
Thanks guys for nice welcome :D
All good!! Reads better than some that only know how to do English  ;)
Thank you i'm gonna remember it :)
Yes glen i've seen your work,and she's look very nice ;D I like when bike is tidy ;) I don't earn much moeny so i do what is need to do in bike.I wonna rebuil all suspension,becouse probably previous owners dont do anything with it. I dont investing in plastics becouse this is my first hard enduro,and i get a loooooooooot crashes and i would cry myself if i broke new plasticks ;D

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #4 on: July 02, 2015, 06:07:18 AM »
Guys,you are my last hope.
I have big problem with fouling spark plugs :( On the beginning i don't care much about this,but now it's pine on the ass. I ride like, 50km and spark plug ios dead i need to put new on.
Firs I've changed jetting first on 45 pilot and 170 main,needle is on first groove and the air scre turnt like 2.I trying to retard my ignition,but this gives nothing.Reed valve is good condition,i've change the float valve and still nothing.
Today i put new jetting 48 pilot and 175 main, needle at 1st groove,and air screw turn out 2and1/2 and i put a warmer spark plug (br7es),and i think that exhaust ist too hot.
I dont know what to do :(

Offline fred99999au

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Re: WR250Z 1998 "the old lady" :)
« Reply #5 on: July 02, 2015, 09:46:10 AM »
Post a photo of the plug. lets have a look.

Offline glen4

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Re: WR250Z 1998 "the old lady" :)
« Reply #6 on: July 02, 2015, 05:11:55 PM »
Don't leave the bike idling, the choke is also used as tick over by enrich ending the mixture, screw the choke right in (it does turn) until it will go no more, this will leave you with no idle, but will help for sure.

These bikes were prone to fouling plugs when they were current, this does help

Offline 2fITy.J

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Re: WR250Z 1998 "the old lady" :)
« Reply #7 on: July 02, 2015, 05:40:50 PM »

Firs I've changed jetting first on 45 pilot and 170 main,needle is on first groove and the air scre turnt like 2.I trying to retard my ignition,but this gives nothing.Reed valve is good condition,i've change the float valve and still nothing.


Today i put new jetting 48 pilot and 175 main, needle at 1st groove,and air screw turn out 2and1/2 and i put a warmer spark plug (br7es),and i think that exhaust ist too hot.
I dont know what to do :(



Making all those changes at once will make it harder to track down what the exact problem is. Make one change at a time and soon you will be on top of the problem...making several changes (or even two or three) will have you guessing what made the difference, given that all impact on the other...even your pilot jet is open to full throttle and makes up part of the induction circuitry throughout the range.



Cheers,
Chris.
A bike in the bush is worth two in the shed!

BMW-BSA-Ducati-Honda-Kawasaki-Lambretta-Matchless-Norton-Suzuki-Triumph-Vespa-Yamaha.

Dirty Dozen '13 DR650SE - '90 DR650RS - '82 IT465J - '82 IT250J - '80 GT80G - '77 A100B - '76 DT100C - '76 TC125 - '75 TM75 - '73 MX80 -       '73 TC100K - '69 TC120-1

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #8 on: September 18, 2015, 07:09:11 AM »
Hello.
It's been long time since i update this topic.Shame there's lots of changes! :D The lady got a new pipe!It's pro circuit's platinium pipe bought for ~300$ with everything.The price includes a carbon fiber guard :) Shes riding more better than on old one pipe! :D
Another change is larger gas tank witch have 12 liters capacity :) I bought it about ~30 or 40$ i'm not 100% sure becouse i bought in my State currency :) Below are pictures how she's looks right now :)
I've changed brake pads,revive brake calipers,and put new rear tire CST 110/90-18` :)
Hope you enjoyed guys,and says what you think about! :D

Offline itdog

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Re: WR250Z 1998 "the old lady" :)
« Reply #9 on: September 18, 2015, 04:09:02 PM »
looking nice  ;D..........is she still fouling plugs? and how far does the standard tank go?

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #10 on: September 19, 2015, 10:53:34 PM »
So far the problem is gone :) I put DENSO spark plug also.Meybe NGK is not so good :P
On the standard gas tank witch have 9l capacity i road meybe 60-70km.Now i can make about130km and more.If i take extra gas into backpack :D

Offline itdog

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Re: WR250Z 1998 "the old lady" :)
« Reply #11 on: September 19, 2015, 11:46:10 PM »
good to see she is running well, I am ordering a desert tank also, hard to find second hand so will have to go new. I will post some pics of my rebuild soon :)

Offline glen4

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Re: WR250Z 1998 "the old lady" :)
« Reply #12 on: September 20, 2015, 03:09:05 AM »
good to see she is running well, I am ordering a desert tank also, hard to find second hand so will have to go new. I will post some pics of my rebuild soon :)

I have the same tank as wujocaza has fitted, and I still have this swing arm if you are interested? I just think that postage from the UK would kill it for you, but I will find out on Friday as I am off work. Looking for £75 for the tank, and £40 for the swing arm if you're interested? I will sort pics

Offline itdog

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Re: WR250Z 1998 "the old lady" :)
« Reply #13 on: September 20, 2015, 03:20:30 PM »
Hey Glen actually removed the pegs from the swing arm and cleaned up well with a flapper disc and elbowgrease  ;D..........keen on the tank though I am in Western Australia 6330 if you can work out postage, have you got some pics?? cheers Alex

Offline itdog

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Re: WR250Z 1998 "the old lady" :)
« Reply #14 on: September 20, 2015, 09:49:29 PM »
Sorry Glenn, just bought a brand new tank mate, decided I prefer the blue rather than the clear...plus its new :)

Offline glen4

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Re: WR250Z 1998 "the old lady" :)
« Reply #15 on: September 20, 2015, 09:59:17 PM »
Sorry Glenn, just bought a brand new tank mate, decided I prefer the blue rather than the clear...plus its new :)

No worries fella, enjoy 😀

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #16 on: November 03, 2015, 09:00:42 AM »
Hello After little break! :)
In meanwhile i was on my first competition,and it was fantastic! The track was rough (as for begginer).He had about 30km,and we had make about 5 lap's.I and my WR make only 4.I've smacked my pipe that she bends and melted my radiator hose,and she starts overheating.I dont want make her something bad,so i've gived up :D
And now i need both original muffler stay's.I turn to you with the request,becouse the prices of OEM parts is to big for me :( Meybye somone got some spare stay's and want help me? :) I would be gratefoul :D
Below i post some pictures from contest :)

Offline Tony H

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Re: WR250Z 1998 "the old lady" :)
« Reply #17 on: November 03, 2015, 11:16:15 AM »
The 3rd picture looks like an exciting moment. Thanks for sharing.

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #18 on: January 01, 2016, 12:07:28 AM »
Hello guys after a short break!
I've recently doing some small thing in bike to get her ready to the new season :D I've rebuild front forks and change steering bearings,and (of course) i've got few question :D
First : I've got some "problems" with my lights.As we all know the WR got neccesary thing to have a front and rear light,but mine are very weak.When it's dark i cant see anything in front of me.And recently i put rear LED light,and when i turned on front light,the rear light Is almost complytly off.I woundering what's cousing the problem? This voltage regulator or the voltage from coil are too low?
Second : My pipe,are constantly cending.I was showing to you guys my new PC pipe,and after few ridings she bends itself! It's somehow bends/crushing/comes closer tohether,i dont know how to explain that so i draw this in the attachment :) Anyone got this problem too?
Thanks for any ideas! :)

Offline 2fITy.J

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Re: WR250Z 1998 "the old lady" :)
« Reply #19 on: January 01, 2016, 07:56:22 PM »
These things are heat treated during and after the manufacturing process so they retain their shape....yours may have slipped through Quality Control or is a "rip-off"....a copy by a very cheap (read chinese) maker.

I would be not be happy with that and would seek recompense.



Cheers,
Chris.
A bike in the bush is worth two in the shed!

BMW-BSA-Ducati-Honda-Kawasaki-Lambretta-Matchless-Norton-Suzuki-Triumph-Vespa-Yamaha.

Dirty Dozen '13 DR650SE - '90 DR650RS - '82 IT465J - '82 IT250J - '80 GT80G - '77 A100B - '76 DT100C - '76 TC125 - '75 TM75 - '73 MX80 -       '73 TC100K - '69 TC120-1

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #20 on: January 02, 2016, 03:11:10 AM »
Or ,do you think guys,that problem might be too high combustion temperature?

Offline wayne61

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Re: WR250Z 1998 "the old lady" :)
« Reply #21 on: January 02, 2016, 06:13:23 AM »
I would doubt that. I know there a different thicknesses involved, but your exhaust is made of steel and your engine aluminium. If it was hot enough to distort the exhaust, that heat would do more damage to your piston.
Just an opinion of course.
Did the pipe hit anything during the race?
Go soothingly on the grease mud, as there lurks the skid demon.

GRIP AND RIP CRAIG AND CHRISSO!!!

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #22 on: January 02, 2016, 08:06:14 AM »
Yes,it has too becouse after race pipe was smashed on few places and i have to send it to reapir.But day before the race,I spotted this problem so that have to happend before.
On my old pipe this space is also very small and pipe dont fit very well.But i dont really know if that's an pipe from wr.No one knows what happend to this bike before.How i can recognize different beetwen YZ 98` pipe and the WR250Z pipe?

Offline 2fITy.J

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Re: WR250Z 1998 "the old lady" :)
« Reply #23 on: January 02, 2016, 08:24:49 AM »
Oh, my mistake...I thought you had bought a NEW pipe from DC.
A bike in the bush is worth two in the shed!

BMW-BSA-Ducati-Honda-Kawasaki-Lambretta-Matchless-Norton-Suzuki-Triumph-Vespa-Yamaha.

Dirty Dozen '13 DR650SE - '90 DR650RS - '82 IT465J - '82 IT250J - '80 GT80G - '77 A100B - '76 DT100C - '76 TC125 - '75 TM75 - '73 MX80 -       '73 TC100K - '69 TC120-1

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #24 on: January 02, 2016, 10:03:37 AM »
Not your mistake.I've problem with clear writing in english so it could be confusing :D
I've bought used PC pipe from Texas to replace my old pipe witch is bendet and other bad stuff.Previous user must have some problems and he used hammer and some flat screwdriver :(
I've replaced it.PC pipe wa fitting ver well (comparing to the old one).After a while,week before race i've observe this weird bend,and fact that pipe somehow didnt fit very well.After a race and sending pipe to repair i woundering what it causing the problem.

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #25 on: January 18, 2016, 03:15:18 AM »
Hello guys!
I've promised to my boss that will show what he could do for my motorcycle :) It's holder (or something like this) to the exhaust valve.My old part was worn off and i havent money to purchase it from oem :( so we decide to make it DIY :P It's made of brass and it's lot havier then original but i hope so it's gonna be strong ^_^

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #26 on: March 04, 2016, 07:01:10 AM »
No one answer,bit i'm gonna continue this topic 8)
Few thing are changed since last post.I bought the supermoto wheels from my friend,they fit but i've got some problem with the front caliper.I cant fit it to the bigger disc brake :(
Second news is that i've rebuild my rear shock,because after few days of riding he started a leak >:( On the occasion i've changed the all bearings on the rear shock arm :)
And about last picture.Yes the Old WR250Z can keep up to the modern 2 strokes 300ccm! :D

Offline sweede490

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Re: WR250Z 1998 "the old lady" :)
« Reply #27 on: March 04, 2016, 10:21:13 AM »

   Nice work wujocaza , that's some handy machining you've done there  :)

   When going to super moto wheels and bigger discs most use an adapter plate to suit
   The calliper, I doubt your calliper will suit the larger discs


      Muzz

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #28 on: March 12, 2016, 07:44:05 AM »
   Nice work wujocaza , that's some handy machining you've done there  :)

   When going to super moto wheels and bigger discs most use an adapter plate to suit
   The calliper, I doubt your calliper will suit the larger discs


      Muzz

Thank you!
And yes, I know that I need adapter plate but I can't design it,and found company witch could make me this adapter on cnc machine :D
I finally (I think) found out what causing problem of my spark plug fouling! It's this little oring on the jet block!She's flat like my ex-girlfriend :DD Unfortunately It's not available In my country and I must bought this from ebay.I have hope that they gonna send me that fast :'(

Offline Challenger

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Re: WR250Z 1998 "the old lady" :)
« Reply #29 on: March 22, 2016, 08:14:58 AM »
Did You checked at Polish Yamaha dealer for part number? It should be there, considering many WR/IT parts I could buy from them.

The Front brake caliper, maybe You should consider doing the technical drawing in AutoCAD so they could easily make the part on CNC. I'll have same problem on mine DT200R with fitting Ducati Monster 600 Brembo caliper. Yet I still don't have the wheel and brake rotor.

Anyway the bike looks SICK with SM wheels, keep it up!

She's flat like my ex-girlfriend :DD
A to szmata  ;D /
Tell me about it  :D


Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #30 on: April 13, 2016, 08:16:01 AM »
Hello there guys!
I still have a problem with the wr :( After change this gasket in the carb (witch I talking about earlier) It's better but still on the 1/2 throttle It's bogging :( I made a short video to show what the problem is)sorrz for bad quality). I out of ideas :(
Any suggestions?

[youtube]http://youtu.be/jSBqGLIMMLE[/youtube]

Offline itdog

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Re: WR250Z 1998 "the old lady" :)
« Reply #31 on: April 13, 2016, 08:22:18 AM »
link not working?

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #32 on: April 14, 2016, 04:17:46 AM »
Sorry  ;D

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #33 on: May 08, 2016, 01:02:36 AM »
The problem is finnaly solved.I've bought The carb reapair kit form the yz 250 00-01 year,and i changed the jet needle.Made some regulations and she's running great! :D



Since I've fix that I burn about 40+ liters of fuel and I didn't change the spark plug even once! :D

Offline 2fITy.J

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Re: WR250Z 1998 "the old lady" :)
« Reply #34 on: May 08, 2016, 07:59:38 AM »
Good result!   8) 8)





Cheers,
Chris.
A bike in the bush is worth two in the shed!

BMW-BSA-Ducati-Honda-Kawasaki-Lambretta-Matchless-Norton-Suzuki-Triumph-Vespa-Yamaha.

Dirty Dozen '13 DR650SE - '90 DR650RS - '82 IT465J - '82 IT250J - '80 GT80G - '77 A100B - '76 DT100C - '76 TC125 - '75 TM75 - '73 MX80 -       '73 TC100K - '69 TC120-1

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #35 on: July 05, 2016, 07:05:56 AM »
Yeah,I fix one thing and another one is bother me :(
My power valve Is constantly unscrew (I don't know it's the correct word :D) and splits on two half inside the cylinder.
I don't have any idea how solve this.I've used all bolts glue and none helped  :(

Offline fred99999au

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Re: WR250Z 1998 "the old lady" :)
« Reply #36 on: July 06, 2016, 09:22:53 PM »
When you say glue, what do you mean? There are some very tough bolt retaining compounds out there, but I guess heat is the major issue.
 
Maybe something like this?http://www.loctite.com.au/3320_AUE_HTML.htm?nodeid=8802627584001

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #37 on: July 07, 2016, 07:35:16 AM »
I'm using some red Forch threadlocker,and now I tried Loctite 243.Still I have not tried to ride/test so i don't know if that helped. ??? I should bought a new power valve,but the OEM price I's killing me :( My salary is 1,500PLN and the valve costs 1,200 PLN ;D Can't find any used one in my country.

Offline fred99999au

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Re: WR250Z 1998 "the old lady" :)
« Reply #38 on: July 07, 2016, 07:52:32 AM »
The loctite 243 is rated to 360F which is 182C which sounds quite low for an exhaust valve. It is also designed as removable.

Maybe try a product with a higher heat capacity?

Offline 2fITy.J

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Re: WR250Z 1998 "the old lady" :)
« Reply #39 on: July 07, 2016, 07:56:14 AM »
Maybe replace the screws/bolts that loosen with stainless steel ones.
A bike in the bush is worth two in the shed!

BMW-BSA-Ducati-Honda-Kawasaki-Lambretta-Matchless-Norton-Suzuki-Triumph-Vespa-Yamaha.

Dirty Dozen '13 DR650SE - '90 DR650RS - '82 IT465J - '82 IT250J - '80 GT80G - '77 A100B - '76 DT100C - '76 TC125 - '75 TM75 - '73 MX80 -       '73 TC100K - '69 TC120-1

Offline glen4

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Re: WR250Z 1998 "the old lady" :)
« Reply #40 on: July 08, 2016, 03:20:27 AM »
I believe the new valves from Yamaha are a one piece item

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #41 on: July 08, 2016, 07:05:40 AM »
I believe the new valves from Yamaha are a one piece item
So I have to make some savings,and buy it :D

So I've tried one more thing. I make a new mounting bolt for the valve from m5 to m6,and also make 2 new bigger dowel pins to fit a little tighter.Today I'm put together WR and it's time for test.
But I'm afraid one thing now.I'm afraid that when the valve Is loosen again,the Dowel pins fel out,and destroy my cylinder  :-\ I make them little bit shorter then original,Maybe Half or 3/4 of the lenght of old ones.  :(

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #42 on: July 12, 2016, 08:04:00 AM »
Unfortunately, the plan failed. After few hours of riding I've dissasembly bike again,and valve Is still untorquing :(
I have no more ideas,except one. maybe some wise and skilled guy can make me one? some kind of skilled turner (?)
What do you think guys about this idea?  ???

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #43 on: September 07, 2016, 04:58:52 AM »
Sooo,they said that people learn on their mistakes.My predictions becomes reality.The piece of power valve felt off,and hit the piston :(
Pics -> http://www.dropbox.com/sc/69yrbhuns3u6k4k/AAB3qTAf-q1lrYnjHXGFJl2ea
So I have rebuild whole engine":
-New Piston
-new connection rod
-new power valve (OEM)
-new cranckshaft bearings
-new clutch,and pushing rod
He now look's like this -> http://www.dropbox.com/sc/gf2c1fmmqn86iri/AAAhEHOJ0BxA8t0ZACtOdLMoa
It's all for now.stay tuned!

Offline 2fITy.J

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Re: WR250Z 1998 "the old lady" :)
« Reply #44 on: September 07, 2016, 07:22:38 AM »
Ooh...nasty!

That's one definite way to keep the world's economy to keep ticking over. Glad it's now getting sorted.





Cheers,
Chris.
A bike in the bush is worth two in the shed!

BMW-BSA-Ducati-Honda-Kawasaki-Lambretta-Matchless-Norton-Suzuki-Triumph-Vespa-Yamaha.

Dirty Dozen '13 DR650SE - '90 DR650RS - '82 IT465J - '82 IT250J - '80 GT80G - '77 A100B - '76 DT100C - '76 TC125 - '75 TM75 - '73 MX80 -       '73 TC100K - '69 TC120-1

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #45 on: September 15, 2016, 04:15:36 AM »
And I also change the clutch basket :D The old one is no longer usable  ;D
Real question folks. How many fuel your bikes have consumed? On the last bike my WR burnt ~20l/100km  :o :o :o :o :o

Offline itdog

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Re: WR250Z 1998 "the old lady" :)
« Reply #46 on: September 15, 2016, 12:52:55 PM »
Mine is also very thirsty, but not that bad....if it was 100kms of mud it would be close though. Ran out of fuel last ride😀
I think the carby is responsible for the bad econom with the  choke circuit for idle adjustment. ..perhaps another yz carby will help ...then the jetting would be close to where you need it

Offline 2fITy.J

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Re: WR250Z 1998 "the old lady" :)
« Reply #47 on: September 15, 2016, 12:56:39 PM »
My IT250 has returns of 28 and 165 klms from a 13 litre tank. Depends on swag of things but mostly the amount of hills/mud/sand/corners/creeks/trees/rocks/ruts/falling off.
A bike in the bush is worth two in the shed!

BMW-BSA-Ducati-Honda-Kawasaki-Lambretta-Matchless-Norton-Suzuki-Triumph-Vespa-Yamaha.

Dirty Dozen '13 DR650SE - '90 DR650RS - '82 IT465J - '82 IT250J - '80 GT80G - '77 A100B - '76 DT100C - '76 TC125 - '75 TM75 - '73 MX80 -       '73 TC100K - '69 TC120-1

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #48 on: September 17, 2016, 05:55:14 AM »
So,there's nothing what I could do.Only option is to change jetting or buy a brand new WR250Z 2016` or YZ250X  ;D ;D ;D

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #49 on: September 29, 2016, 04:36:35 AM »
Soo,I'm gonna have to move out from my house and I need money. The lady is for sale :(
Last pics: http://www.dropbox.com/sc/wtspgzd3dku7m4c/AADJh2ICEO0Uaj40SO7h13hva

Offline sweede490

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Re: WR250Z 1998 "the old lady" :)
« Reply #50 on: September 29, 2016, 06:05:17 AM »


Such a cool bike , a shame you have to sell

    Once your all sorted will you pick up another ?



     Muzz

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #51 on: October 04, 2016, 07:21:17 AM »
Great news for me.My friend Is lawyer and he find hole in the law,and I can stay at home and nobody can kick me out!! So WR stays with me <3

So I decided to solve the problem with fuel economy and spark plug foulding.
My first thought Is that carb might be worn out,and he's does not sprayed fuel very well.After changing gasket under jet block,needle,jets,air screw,gaskets and valve left me only one Option. Choke! I've take out all this,black thing ;D and take a closer look. First what I've think was that idea putting the idle speed and choke in one thing is stupid :D After that I take closer look at choke valve and I have strange feeling that something's missing.Somone can confirm that? (pic below)
Another thing Is that when i look at the choke window (from the reed valve site) on idling window is half opened,and i woundering if it's right.
Thanks for all sugestion folks! I'm gonna update you constantly. Im gonna solve this problem!!!

pics http://www.dropbox.com/sc/2f8196ntdp78ngs/AAA9NAW-Eh3Amxt3AwinmiXVa

Offline itdog

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Re: WR250Z 1998 "the old lady" :)
« Reply #52 on: October 04, 2016, 12:51:54 PM »
Doskonały!!......Cant see your pic? But pretty sure the stock carb is the cause of the poor economy and its directly related to the choke circuit, could always try blocking it off and see how you go on a tank...of course she wont idle though. Let me know how it goes..I am always the first to run out of fuel on rides

Offline glen4

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Re: WR250Z 1998 "the old lady" :)
« Reply #53 on: October 04, 2016, 07:33:07 PM »
Great news for me.My friend Is lawyer and he find hole in the law,and I can stay at home and nobody can kick me out!! So WR stays with me <3

So I decided to solve the problem with fuel economy and spark plug foulding.
My first thought Is that carb might be worn out,and he's does not sprayed fuel very well.After changing gasket under jet block,needle,jets,air screw,gaskets and valve left me only one Option. Choke! I've take out all this,black thing ;D and take a closer look. First what I've think was that idea putting the idle speed and choke in one thing is stupid :D After that I take closer look at choke valve and I have strange feeling that something's missing.Somone can confirm that? (pic below)
Another thing Is that when i look at the choke window (from the reed valve site) on idling window is half opened,and i woundering if it's right.

I am away at the moment, but I will help when I get home. I do know that if you let the bike idle it will foul plugs all the time, wind the choke knob fully closed, no idle at all
Thanks for all sugestion folks! I'm gonna update you constantly. Im gonna solve this problem!!!

pics http://www.dropbox.com/sc/2f8196ntdp78ngs/AAA9NAW-Eh3Amxt3AwinmiXVa

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #54 on: October 07, 2016, 07:10:07 AM »
Little update.
I wrote email to FrankMXparts about choke.I got a response and NO there's no seal under te choke button witch is weird and looks little bit funny :D
I've wash my carb in the ultrasonic washer,and asseble it again.Fired up and wr still run's bad and make bogging noise on middle range throttle.Smokes badly,my mother said that I can go to military and make smokescreens with that bike :D
So back to the topic.I borrow carb from my friend witch is KEIHIN PWK 38 airstrike model with all the good (or bad) things like fuel strike (fuel pump) and Throttle Position Sensor (TPS) from Kawasaki KX 250 2007year. I cleand it,check witch jets are in,and mount it to the bike. Little disclaimer.If you put this carb with TPS,you have to pull it out.Otherwise he's gonna base on the frame other things fits perfect :D
First Kick and BAM!!! WR fired up and sound great on the start. Little bit of adjustment with the airscrew (from 3full turns to 1/2 half!!!) and WR sounds like never before.No smoke,no bogging on the middle range,revs like crazy.
So in conclusion if you got problem with your PWM change it to PWK 38 airstrike (shorty).
Soon more info and videos with diffrences :)

Offline itdog

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Re: WR250Z 1998 "the old lady" :)
« Reply #55 on: October 07, 2016, 12:46:02 PM »
Awesome ...let me know what the fuel economy is like ☺

Offline itdog

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Re: WR250Z 1998 "the old lady" :)
« Reply #56 on: October 08, 2016, 06:42:15 PM »
What size jets is the PWK running...especially the main jet....I see there is a  supplier on ebay selling these new for $213 (chinese ) with jetting that looks very close to suiting out the box for the wr250 ;D also does not have the throttle sensor fitting

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #57 on: October 09, 2016, 03:35:06 AM »
Alright.I picked up my new carb today :D Of course notr without the troubles.The delivery company send my package to the city 60km away from me by mistake  >:(
But back to the topic. I've mounted the carb without any cleaning and any jets change,carb came with 165 main,35 smaller and needle on 3rd groove.Fired up and she's runnig wild! She's really never ride like this.Respond when I pull the throttle Is amazing.Little bit snappy but hey! It's a 2stroke  ;D ;D after couple runs and revs I decided to put #45 pilot jet,and ohh boy.I can wheelie on 5th gear! :D
I've just back from little ride and I can already feel the difference. She's somekind a lot quieter on low rpms,respond on throttle is immidietly,somehow It feels a lot easier to controle and ride.And shes burned only ~1,5l/15km :D
Tommorow I go on the bigger trip so stay tuned for more :D
What size jets is the PWK running...especially the main jet....I see there is a  supplier on ebay selling these new for $213 (chinese ) with jetting that looks very close to suiting out the box for the wr250 ;D also does not have the throttle sensor fitting

It's hard to say for me witch jetting would be on this carb.But in my carb, witch it's PWK from KTM 250 EXC 2008y, was very similar jetting.Also all jets for keihin are the same (threads and jet build) so it's no problem :D

Also two videos,from the comprahasion PWM and PWK from KX 250 07 :)
PWM -

PWK KX 250

I hope that anybody can read what I'm writing becouse even with the translator It's hard to translate my thoughts from Polish,so IM SORRY! :D

Offline itdog

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Re: WR250Z 1998 "the old lady" :)
« Reply #58 on: October 09, 2016, 12:14:05 PM »
look forward to full report ;D

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #59 on: October 11, 2016, 06:40:32 AM »
So! yesterday i went for a longer ride.We've make about 70-80km and the old lady burnt around... 9-10 liters of fuel!!! It's amazing change! On the PWM carb on the exactly same amount of km burned 15-16 l of fuel!
On top of that.I didn't have time to check after this ride,but day before ride (when I got the carb) I check the sparkplug discoloration after short ride around the house.Plug had a perfect color chockolate milk. The dreams come true guys! :D
So in conclusion. I'm happy like never before.Bike feel's great,rides like brand new,fuel consumption like in 2000-2014 ktm's,ride like a squirell after cup of coffe made of red bull  :D :D

Offline glen4

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Re: WR250Z 1998 "the old lady" :)
« Reply #60 on: December 05, 2016, 10:19:40 PM »
How has the bike fared with the new carb? I am getting the same issues with my WR and have got the same KTM carb as you to try. What jetting have you now?

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #61 on: December 16, 2016, 08:56:27 AM »
After when I bought new carb I dont ride too much.Maybe couple rides,and I get little bit sick and the weather it's too cold to ride for me.
But back to the topic. My jetiing is 160 main jet and 40 pilot jet. Depending on temperature outside i change only needle clip position 2-3 from the top. She's running wild like never before,the fuel consumption is better to. Fuel consumption dropped from 17-19/100 to 9-10/100. Now I just puy my desert tank and I'm not worrying about run out of fuel too soon :)

Offline glen4

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Re: WR250Z 1998 "the old lady" :)
« Reply #62 on: December 17, 2016, 08:18:24 PM »
Cheers bud, gonna chuck it on there and try it  :)

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #63 on: December 19, 2016, 03:10:43 AM »
SOrry for mistake.Yesterday I dissasembly the carb,and clean it in ultrasonic and I have 165 main not 160 and 85 starter jet (i believe it's idle jet).Sorry for mistake  :-[
Also I make little progress with the bike.I changed bearings and seals In rear wheel,and take out bearings on swingarms. I belive they are In this bike since the factory  ;D ;D

http://www.dropbox.com/sc/tcpzwy6keqy8hjh/AABpsx65yWG8xORiwpTtoqF7a

Offline glen4

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Re: WR250Z 1998 "the old lady" :)
« Reply #64 on: December 19, 2016, 03:15:20 AM »
Cool, thank you, have got a 168 main in stock so will start there, believe pilot fitted is a 35, so gonna go 40 and try it.....
Those bearings look in need of a bit of love, have you done the linkage bearings too? The bearings were fine on mine, I think the previous owner must've had a free supply of grease!!!

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #65 on: December 19, 2016, 06:32:14 AM »
Yes, I have replaced linkage bearing along with rear shock when was serviced. But after one season,i've checked bearing again ANd they were all rusted and dirty.Now I'm  gonna clean and regrease them after every 15mth :D I can rescue the Bearings on swingarm,but the sleeve's are too worn out and also thrus bearings are completly destroyed. When I'm gonna sell old carb,I buy the all balls kit for swingarm :D
On the start I've got too 35 pilot jet,but bike was idling "too hot" :D

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #66 on: February 04, 2017, 05:08:29 AM »
Hi all after little break! :)
Finally I can afford on new swingarm bearings kit :D Lady finally stands on her own,and she's waiting for warmer temperature outside,becouse rider Is very sensitive for catch colds :D
But I got question to you guys.How frequently do you clean and regrease bearings on swingarm and relay arm? 20mth should be good or less?

Offline glen4

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Re: WR250Z 1998 "the old lady" :)
« Reply #67 on: February 04, 2017, 07:11:44 PM »
Very much depends on what conditions you ride in. If using during winter months in lots of sloppy, wet going I would suggest at least twice a season, once mid winter and once when coming into spring, use a good quality waterproof grease

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #68 on: February 06, 2017, 02:53:44 AM »
Very much depends on what conditions you ride in. If using during winter months in lots of sloppy, wet going I would suggest at least twice a season, once mid winter and once when coming into spring, use a good quality waterproof grease

Can you recommend some grease? I'm using the red valvoline but he's not so good :x

Offline glen4

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Re: WR250Z 1998 "the old lady" :)
« Reply #69 on: February 07, 2017, 07:48:14 AM »
Can you recommend some grease? I'm using the red valvoline but he's not so good :x

I use bel ray waterproof grease, but any decent grease will do, trick is to keep it fresh

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #70 on: March 06, 2017, 04:17:11 AM »
I got another problem with the lady :( The problem is very Stiff feeling of the clutch. I got new basket,New clutch plates and OEM clutch springs,OEM push rod.New clutch cable,and also I have Accel CL-01T with 3 different arms placement for cable.
And after all this improvements clutch still feels very stiff and hard to pull.I've compared my clutch feeling to the YZ450f 2004 (i believe) and the YZF clutch feel was soo much smoother than mine  :o
Any sugestions?  ??? ???

Offline fred99999au

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Re: WR250Z 1998 "the old lady" :)
« Reply #71 on: March 06, 2017, 11:39:09 AM »
Have you lubed the cable?

Offline Jock

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Re: WR250Z 1998 "the old lady" :)
« Reply #72 on: March 06, 2017, 11:50:52 AM »


Is the cable routed correctly?

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #73 on: March 07, 2017, 07:07:36 AM »
Yes,cable is lubed and also is routed properly (i've checked in service manual).

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #74 on: March 12, 2017, 09:23:04 AM »
Im a big dummy :( I take the cable out and found that it's not moving.Little bit lubing and she's start moving just a little bit lighter.She have to be snapped somwhere inside,so I decide to order a new one from PROX.I lubed it on start and leave this funny little bushings on the tips of the cable.The results are amazing.Clutch on one finger just like hydrualic.
On my defence I wanna say that I have changed the clutch cable few weeks ago,and lubed it before ride so I eliminate that possibility on the start  :-X :-X

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #75 on: April 15, 2017, 11:48:10 PM »
Last time when i went on a ride I've last my brake pads...Not onlyt brake pads but also all those weird metal things called "supporters". So I went to my local to my dealer to order this and guess what. THEY ARE NOT AVAILABLE.They even dont exitst on the diagrams of parts :/ I'm comeback to home,take a beer and turn on computer.After few fail videos on youtube I've started to searching this "Supporters". And voila! I found it,and bought it from HONDA! Specifically from 2002 cr 85 for rear caliper and 99 for front caliper,and they fit perfectly!
I leave number of these parts here if someone gonna have search this little bad boys :D

45112-KS6-701 upper hold supporter (front caliper)

43112-GT-006 rear brake caliper supporter (on the holder of caliper)

43108-MY6-671 rear brake pads support

Offline Martin I Henry

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Re: WR250Z 1998 "the old lady" :)
« Reply #76 on: April 16, 2017, 12:42:07 AM »

Nice work Wujocaza .

Thanks for sharing that information.

Cheers,

Dave R.

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #77 on: September 19, 2017, 12:37:55 AM »
Hello guys after longer brake! :D
I've made a lot changes.I've changed job and move out from my family home. WR Is standing and waiting for better days :(
I have a lot free time now and I m sitting in office and thinking "what i could change in WR so she's could be more badass?" And it's hit me... Flywheel weight! Great idea!I immediately started looking for information how much did it cost etc. It's cost too much for me so i Decided that i do It by myself.So i'm back at home and start measuring everything but then!!! I measure weight of my flywheel and it's 1050 grams!! Holy sh*t It's already heavy! I forund some movie on youtube where some guys measure weight of his flywheel form some yz 250 98> and its had 650gram!
Now I'm sitting and woundering it's worth to make this flywheel weight or better do something else.
What do you think about this guys?
Thanks for answers,cheers :)

Offline itdog

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Re: WR250Z 1998 "the old lady" :)
« Reply #78 on: September 20, 2017, 07:26:59 PM »
flywheel is fine its weighted great for the bike...upgrade the suspension or work the head by machining the squish

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #79 on: September 25, 2017, 10:48:12 PM »
flywheel is fine its weighted great for the bike...upgrade the suspension or work the head by machining the squish

Thanks for answer! :D
i thought about tuning my head.I've founde TPC (twostrokeperfomrance) where They are machining head's but it's too much for me :/ They want 250$ from the start plus shipping from Poland to Australia.
Sooo I must stay with my head :( Otherwise I'm gonna put tubliss system into rear tire and put some new michelin starcross 5 medium size 120/90. But this is the plan for next season :D

Offline itdog

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Re: WR250Z 1998 "the old lady" :)
« Reply #80 on: September 27, 2017, 08:44:07 AM »
there are plenty other machine shops that can adjust the squish for you...must be someone in Poland search Eric Gorr PDF file on the net has specifically what needs to be done for performance on the early YZ heads from 96 to 98

Offline Wujocaza

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Re: WR250Z 1998 "the old lady" :)
« Reply #81 on: October 13, 2017, 07:55:29 AM »
there are plenty other machine shops that can adjust the squish for you...must be someone in Poland search Eric Gorr PDF file on the net has specifically what needs to be done for performance on the early YZ heads from 96 to 98

THank's for tip!This can be very handy! :)

Ok,I do some reading about exhaust valve governor.There is an option to make WR less agressive. People say that you can put in governor spring from the new YZ250X.It's quite longer and stiffer. People say that YZ250 (99year +) becomes less agressive,powerband hit a little bit later and get more traction.
They also talk about washers but on older YZ engines,the thickness of governor washers Is the same as YZ250X :)

Soon I'm gonna buy a spring,and make little test :)

For those who are intrested theres topic -> http://thumpertalk.com/forums/topic/1155999-yz250x-governor-spring/
And there is part number -> 90501–290A2–00