Author Topic: '82 Yz 100 Project  (Read 7617 times)

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Offline Helmet_Hair

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'82 Yz 100 Project
« on: March 05, 2011, 03:50:45 PM »
I'm pretty sure I'm going to do this now.  I've got a nice IT 125 motor and now a line on an '82 YZ 100 chassis (actually, a complete bike).  With a lot of work, I think I can make this into a nice bike.  The biggest issue is whether I can convert the right hand drive over to left hand for the IT motor.  I still have IT 125 rear wheel and spacers.  I think I may just have to figure out engine mounting points and a way to secure the right side of the rear brake plate to the swinger.  Sounds straight forward, but concepts are always easier than reality.  Anyone ever try something like this?

Here's a link to the bike in question:

http://seattle.craigslist.org/tac/mcy/2243651660.html

I offered $150 and he said "OK"....so pretty much a no-brainer for a complete parts bike/rolling donor chassis, eh? ;D
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline 4V5

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Re: '82 Yz 100 Project
« Reply #1 on: March 05, 2011, 03:55:45 PM »
Nice find!!

Might be an easier swap to put an IT175J/K engine into it..

Cheers!
Leslie
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 Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #2 on: March 05, 2011, 04:18:10 PM »
Yes, that'd swap straight over, but I've got the 125 here that's begging for a good home.  I may have to figure this one out.  Any words of wisdom?
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline 4V5

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Re: '82 Yz 100 Project
« Reply #3 on: March 05, 2011, 05:30:57 PM »
No worries!!

If it has to be done, start getting the 125 rear wheel in the swingarm then making a rear engine mount to suit the rear arm and getting the chain alignment done in one go.. although first check if the 125 engine will actually fit in the frame and you don't come across any issues like I had with my YZ80/175

http://www.yamahait.com.au/forum/index.php/topic,216.0.html

the main area is whether the kick arm will clear everything.. but on your swap it will be custom chain guides and a lot of work around the swingarm...

it's a big job... my YZ80 is version number 3.,. as in I've had 3 attempts at that bike and it's still not right...


have a good think about every modification before getting the grinder out I suppose is the best advice  ;D

Cheers!
Leslie
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 Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #4 on: March 06, 2011, 04:09:00 AM »
Thanks, Les...that's the kind of info I needed.  Definitely measure 7 times, cut once! ;D  I'll need to have a firm, know-it-works plan in place before any cutting and fabbing begins.  What I don't really know, is whether the Yz 80 shared a frame with the yz 100.  I thought (maybe wrongly) the 100 shared with the 125, but it may be its own beast altogether.  What I DO know is that the YZ 100 J/K shared the same crankcases with the IT200.  My 125 shares cases with the early IT 175.  I don't know how all this is going to come together...I guess that's the fun of it.  I'd have $300 into it all told...that's with two nearly complete parts-bikes: IT125 and YZ100.  I really want the linkage frame and better suspension chassis of the YZ with the tractable motor of the 125.  It would be what Yamaha should have made the IT125 to be all along. 8)
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline Martin I Henry

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Re: '82 Yz 100 Project
« Reply #5 on: March 06, 2011, 04:28:28 AM »

  I have a photo somewhere of an IT175F bottom end sitting in an IT175J frame, looking rather lost with all the space around it !

  Not sure what would line up and what would need cutting to suit, but I know it will keep you busy for a while !!

  My plan is to have an IT100J !

  Dave R
 

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #6 on: March 06, 2011, 06:01:04 AM »
Yes, I'd sure like for this to work...if not, I suppose I could source an IT 200 motor...but the intent is a good "home" for the IT125 motor.  Good for chasing the kid around on the PW 80, then when he's tall enough, he can move up to that bike without too much drama. ;)
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline Martin I Henry

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Re: '82 Yz 100 Project
« Reply #7 on: March 06, 2011, 07:32:08 AM »
Quote
I have a photo somewhere of an IT175F bottom end sitting in an IT175J frame, looking rather lost with all the space around it !


Here it is :



Dave R

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #8 on: March 06, 2011, 07:43:30 AM »
Yes, that frame looks alot like the YZ J frame.  Appears the F motor sits a little too low and to the rear.  Front motor mount looks like it works well.  What do you remember from this fit as far as what you'd do to make it work?

Here's another option I found on a separate website:

***************************************************************************************

I have a 1982 YZ100, childhood dream bike, and I love it. I have heard of guys putty a IT175 cylinder /top-end on them for better performance. Is this true and has anyone done it and could give helpful advise and what to get for a sucessful conversion. Thanks
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GABowles


   
PostPosted: Thu Oct 14, 2010 12:22 pm    Post subject: 82/83 YZ100 IT175 conversion    Reply with quote
The 1982/83 YZ100 motor is the same basic motor as the 1980 and 1981 YZ125. It is also basically the same as the motor in the 1980 through 1982 IT175. However, the only IT175 cylinder that is possible to use would be the 1982 year model. The 1980 YZ125 and 1980/81 IT175 cylinders will physically bolt on, but they have an exhaust port that exits to the side. You need an air-cooled cylinder that has a center-exit exhaust port. Only the 1982 IT175 fits that criteria.

I have done this conversion on a 1980 YZ125 with a 1980 IT175 cylinder. You will need to use the IT175 connecting rod as it is a different length. The other issue is the flange on the end of pipe where it attaches to the cylinder. I just cut the flange off of the IT175 pipe and welded it to YZ125 pipe and it has worked well.

The other thing you might consider is a change to a 1981 YZ125 rolling chassis. The 1982 and 1983 YZ100 had that intermediate link type of rear suspension. Not too many people are fond of that rear suspension. Only the 1981 (not 1980) chassis will work because of the center exhaust port configuration. Out west the 100 class seems to have picked up some steam and the 1982/83 YZ100 motor in a 1981 YZ125 chassis (with the water cooling stuff removed) seems to be the perceived hot ticket.

I would suggest using the YZ100 ignition on the IT175 motor. The IT175 motor has an external rotor ignition that seems to make the motor a little less lively.

Hope this helps,

Greg
_________________
Greg Bowles
Thousand Oaks, CA
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline Martin I Henry

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Re: '82 Yz 100 Project
« Reply #9 on: March 06, 2011, 08:00:39 AM »
Sorry Ron, I should have made it clear in my post. That engine is only resting in that frame, no attempt was made to bolt it up in any way.

I think I took that photo for Denzle for some reason.

Dave R

Offline sweede490

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Re: '82 Yz 100 Project
« Reply #10 on: March 06, 2011, 09:42:13 AM »
These were not common here , but I found this one it,s a bit expensive but it has a lot of photo,s I thought might be handy to you
 for a refferance

 http://www.trademe.co.nz/Trade-Me-Motors/Motorbikes/Motorbikes/Dirt-bikes/auction-358930868.htm


  Muzz

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #11 on: March 06, 2011, 12:15:52 PM »
Thanks, Muzz....the motors appear nearly identical and the rear mounting point is the same on both.  The front mount appears still to be lower on the Yz 100, but not as low as on the IT-J in Dave's picture, so that's good.  The big questions are going to be how or what to do about the  chain/sprockets moving to the left of the bike.  Conceptually, one would just weld a lug on the swinger on the left side for the brake plate, hang a chain guide on the left of the swinger, mount a roller guide up on the frame and move the chain slider to the left of the swingarm, and Robert's your mum's younger sibling.  'Course reality being what it is.....I'm in for an adventure!
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline Martin I Henry

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Re: '82 Yz 100 Project
« Reply #12 on: March 06, 2011, 07:09:04 PM »

I have never ridden a YZ100, but I think they have a reputation for having decent power across the rev range, not just up the top end.

I know it is a completely different bike but.... My YZ125E, when fitted with the far heavier IT175E flywheel and ignition had a surprising amount of usable power down low. I was expecting it to struggle with my sloth like riding style, but the engine ran however low I let the revs get.

What I am saying is... How about getting an IT175G onwards flywheel and ingition and see if it will fit the YZ100. You may be surprised at the end result.

Dave R

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #13 on: March 07, 2011, 02:08:52 AM »
All options are on the table until I can see the motor and frame, etc.  Sounds like the motor is complete toast, but that doesn't rule out a new crank and piston, bearings etc if the rest of it is good. Actually, might be nice to have a bike I could swap out several different motors into depending on the "mood" or the desired job on a particular weekend...wanna moto?  Swap in a YZ125 motor.  Trail ride?  IT 125.  Grunt around with the old farts?  IT 200.  Ring-ding in a classic race?  Swap back to the stock motor.  Keep the back wheel and all the chain guide stuff at the ready on the right side, and this could be pretty sweet!
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #14 on: March 07, 2011, 04:54:04 PM »
Well, I got it home.  She's pretty complete minus piston and crank.  The crank was frozen solid and luckily was removed from the crankcase.  I think the IT crank would go in.  I'd be missing the IT cogs, though.  Not sure if the top end is going to fit.  The case has 2 locating dowels for the barrel which the IT barrel doesn't have.  With regard to mounting the lower end to the frame, there's a third mount on the bottom which the IT also doesn't have.  Don't know if that's going to be a deal-breaker yet or not.  When I have a few moments, I'll see how it all might go together and then weigh my options.  Pretty sure I'll go ahead and build both motors anyway.

Pics will be forth-coming of course.  Lots of noodling to do on this one.
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #15 on: March 08, 2011, 03:05:08 PM »
I know I need to get some pics up of this thing, but I don't run around with a camera taped to my wrist.

I was excited to get home this eve and see what I could find out about the IT125 lump going into the YZ 100 frame.  I mocked it up and was surprised that it fit nicely!  Even the pipe fit like it was made for it.  The bad news is, there's not a SINGLE mounting point I can use on the frame for this motor! :-[  The bottom ends are just too different.  The kicker on the IT motor is way at the bottom of the  case (comparitively speaking) while the YZ's is mounted almost on the top of the case.  This fouls the foot peg in the worst possible way.  If I move the motor further back, I lose the beautiful angle of the pipe, further up and she fouls the tank.

I looked at whether I could just put the IT jug on the YZ bottom end, and sure enough, everything was sized just right, but of course the bolt pattern was off a few mm on each side. >:(  Can't win for losing...right out of the gate!

Short term, it looks like I'm stuck rebuilding the YZ motor.  Needs a crank piston and little bits and bobs...otherwise, this motor is complete.

I'll try and get some pics up this weekend with another mock-up of the IT motor in the YZ frame with all the  accompanying parts.  You smarter fellas may have some wisdom for me on this.

First order of business will be a manual for this little beastie so I can hopefully get her to go together correctly.
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline sweede490

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Re: '82 Yz 100 Project
« Reply #16 on: March 08, 2011, 06:12:54 PM »
I have a pdf parts manual if its any help  .. I cant post it here  pm your email and I,ll send it to you



          Muzz


Offline NETRA3

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Re: '82 Yz 100 Project
« Reply #17 on: March 10, 2011, 11:13:08 PM »
I owned a yz100j back in the 80's. the bike was one of my favorites, I actually bought another one and sold it to finance other bike projects, what a mistake that was! Anyway... the vintage 100 class has been re introduced over here on the east coast AHRMA motocross curcuit. The rm's and yz 100's are becoming more sought after than ever. I've seen complete roaches going for $500 bucks. If you have one hang on to it.....I also like the idea of putting a 175j/k engine in one of these bikes...cool stuff...Dave.
82 Yamaha It 175j, 2005 Ktm 250 exc,  77 Honda xr75,

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #18 on: March 11, 2011, 01:35:25 AM »
Good ideas, and good to hear about the resurgence in popularity of this little tiddler.  I'm pretty happy with the overall condition of the bike.  Other than the frozen crank, everything else is completely usable.  I have all stock plastic (yes, even fenders) the seat is original and in fairly good shape.  I have no plans on chopping up the frame to make the IT125 motor fit.  I'd rather see what I can do with creative motor mounts and somehow use the existing lugs on the frame.  If it turns out to be an exercise in futility, I've got the 100 motor to put back in, and there seems to be all sorts of things to do to this motor to get nearly any kind of power one would like out of it (within reason).  Also keeping my eye peeled for a '82 IT 175 cylinder, which sounds nearly "plug-n-play".  The tranny is a 6 speeder and everything else seems pretty standard Yamaha. ;D
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #19 on: May 22, 2011, 09:05:01 AM »
I've not been idle with regards to this project, it's just taken a long time to assemble most of the parts (small, little bits mostly) and get ready to put together.  Crank bearings are in, cases put back together and crank seals in.  Here's some progress pics.







Now, my question is, I need some type of "o-ring" for the main gear coming off the crankshaft.  What I'm noticing, though is that when I tighten the nut down for the main gear, it hangs up the crank.  The crank barely moves and just seems all wrong.  Looks like there should be some sort of journal or something to protect the gear from the o-ring.  What have you guys found with assembling this piece?

'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline 5X8rider

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Re: '82 Yz 100 Project
« Reply #20 on: May 22, 2011, 11:21:59 AM »
There is a oring that goes on the crank before the gear goes on. It has a very small cross section. It just helps to seal the crankcase from the gear box. You could probably get away using sealer in there.
 If the crank is binding when the nut goes down be sure the crank bearings are seated, smack it with a dead blow hammer on each side and see if that loosens it up. From the picture you posted it looks like the seal isnt in all the way??

Pete
82 YZ490
82 IT175
82 CR80R
87 XR600
85 CR500

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #21 on: May 22, 2011, 03:44:35 PM »
You're right, the seal is about a mm from fully seated.  I'm taking it a little easy, as I'd seated the last seal too far in and had to replace it.  Nightmare I'd just as soon not re-live. :P  So, on your '82 IT, is it a metal o-ring or something that rides on the journal of the main gear?
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline Martin I Henry

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Re: '82 Yz 100 Project
« Reply #22 on: May 22, 2011, 05:40:53 PM »

Quote
If the crank is binding when the nut goes down be sure the crank bearings are seated, smack it with a dead blow hammer on each side and see if that loosens it up.

Pretty sure this is the problem Ron. You could also warm up the cases a bit to help the bearings seat correctly.

The rubber o-ring is nothing to do with the crank being tight.



Quote
1 3R3-16111-00-00 GEAR, PRI DRIVE (18T)   1   
2 90204-12007-00 WASHER, SPRING   1   
3 90179-12335-00 NUT, SPECL SHAPE   1   
4 93210-20027-00 O-RING   1   
5 3R3-16300-00-00 CLUTCH ASSEMBLY   1   
6 3R3-16150-00-00 PRI DRVN GEAR (62T)   1   
7 1G8-16371-00-00 BOSS, CLUTCH   1   
8 3R3-16325-00-00 PLATE, CLUTCH 2   4   
9 537-16321-00-00 PLATE, FRICTION   5   
10 1W1-16351-00-00 PLATE, PRESSURE 1   1   
11 90501-20361-00 SPRING, COMPRESSION   5   
12 90159-05011-00 SCREW, WITH WASHER   5   
13 90201-174E1-00 WASHER, PLATE   1   
14 90560-17190-00 SPACER   1   
15 90201-174E1-00 WASHER, PLATE   1   
16 90215-14204-00 WASHER, LOCK   1   
17 90170-14171-00 NUT   1   
18 2X3-16357-00-00 ROD, PUSH 2   1   
19 93503-16010-00 BALL 3   1   
20 30X-16358-00-00 PLATE, PUSH   1   
21 92990-06200-00 WASHER, PLAIN   1   
22 95380-06600-00 NUT, HEXAGON   1   
23 1W1-16356-02-00 ROD, PUSH 1   1   
24 3R3-16380-02-00 PUSH LEVER ASSEMBLY   1   
25 90508-14426-00 SPRING, TORSION   1   
26 90201-14217-00 WASHER, PLATE   1   
27 93104-14059-00 OIL SEAL   1   
28 93315-21429-00 BEARING   1   
29 93604-16092-00 PIN, DOWEL   

Dave R

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #23 on: May 23, 2011, 12:08:12 AM »
I ran into this problem when I put the case halves back together (right side/flywheel side) binding.  I did use my Tusk crank-install tool to pull the bearing further into the case which makes it now nice and free...of course that's the opposite side we're speaking of. 

So, that o-ring is just a standard rubber one and not a special metal washer of some sort?  It doesn't look like it does much...what this seems to need is something like a sleeve to protect the crank seal from the gear....but as I'm thinking about this, if the left (main drive) crank bearing isn't pulled fully into the case then the journal on the main gear isn't contacting the inner part of the crank bearing, thus causing the the gear to bind to the outer part of the case...hmm, I think I get it. :P

I still don't see the point of the rubber o-ring in there. ???
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #24 on: May 24, 2011, 01:34:52 PM »
OK, I drove the seal in a little further and I think I brought the crank bearing in a half mm or so as well.  The main shaft gear now seats against the crank bearing on the inside (pretty sure that's what we want), but the seal still drags on the journal of the main gear.  Is this supposed to do that?  I don't see any other way around that, but seems like it would cause the seal to wear too early.  Maybe I'm just paranoid. ::)
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #25 on: August 10, 2011, 02:23:33 PM »
Motor is finally all buttoned up with a fresh 1mm over bore, new Wiseco piston, etc, etc.  The motor looks the goods, that's for sure.

By henram36 at 2011-08-09

Painted up the swinger, and frame just a bit.

By henram36 at 2011-08-09


By henram36 at 2011-08-09

Buttoned it up and called it an evening.  The rest should go pretty quick, as I've been also doing some cleaning and minor painting of the plastic bits.  Also waiting on some fresh fork boots and tank graphics.


By henram36 at 2011-08-09

'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #26 on: September 06, 2011, 11:40:10 AM »
All done.  Still needs some tank stickers, and a little clean up of the front wheel.  Runs and sounds super with the IT 125 silencer/spark arrestor.  Also, a little research reveals she's an '83.  Last of the YZ 100's...the 100-K. 8)

Sorry for the crappy pics...I'm not good at location.


By henram36 at 2011-09-05


By henram36 at 2011-09-05


By henram36 at 2011-09-05


By henram36 at 2011-09-05


By henram36 at 2011-09-05
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline enduras_wr200

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Re: '82 Yz 100 Project
« Reply #27 on: September 06, 2011, 03:49:47 PM »
Now, she's a beauty! I totally like it. And no sign of modification is obvious! Only thing that doesn't do her justice is the forks that need a bit of taking care (paint or polishing, or both). Have a good time riding, and happy hunting the son on the PW.
Cheers, Fanis

Offline NETRA3

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Re: '82 Yz 100 Project
« Reply #28 on: October 03, 2011, 12:42:00 AM »
That thing is sooooo sweet!....Nice job.....Some guy's will pay a pretty penny for one of those over here on the east coast.....I had the same bike and let it go....still kicking myself for that one!
82 Yamaha It 175j, 2005 Ktm 250 exc,  77 Honda xr75,

Offline erniek

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Re: '82 Yz 100 Project
« Reply #29 on: February 09, 2012, 09:03:21 AM »
This thread got me off my butt to fix up my '82 yz100.  Anyway, for those wondering what to do with em, I say fix em up.  There is a huge market for them with some going for up to $2000.  Anyway, just finished today and couldn't be happier.



Runs like a top.  Ready for vintage racing this weekend in the 100cc class!

Offline enduras_wr200

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Re: '82 Yz 100 Project
« Reply #30 on: February 09, 2012, 08:13:41 PM »
   Welcome to the forum erniek, great little bike you've got there! Happy riding/racing!

   Cheers, Fanis

Offline sweede490

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Re: '82 Yz 100 Project
« Reply #31 on: February 09, 2012, 08:17:16 PM »
HI Erniek , welcome to the forum , you,ve done a top job on your 100 ..

  go over to introductions and say hi and tell us more about your resto






        Muzz

Offline NETRA3

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Re: '82 Yz 100 Project
« Reply #32 on: February 28, 2012, 11:57:27 AM »
Wow, I'm jealous, that thing looks so sweet! Great job!
82 Yamaha It 175j, 2005 Ktm 250 exc,  77 Honda xr75,

Offline WIXEE

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Re: '82 Yz 100 Project
« Reply #33 on: February 28, 2012, 12:09:28 PM »
Nice little ride the YZ100.. ;)

My mate had one back in 93'-94.

It was great to ride on the MX track.. but loved to eat the gears for some reason????
Seen that bike move from generation to generation and to the shop to get fixed and back again.. ;D ;D ;D

Anyway nice ride bud.

Cheers,

Wixee.
WR500ZD 92'     


"I'll let you sniff my fumes but don't whinge when you get a rock in the head"

"Those dear to god want nothing"

Offline Helmet_Hair

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Re: '82 Yz 100 Project
« Reply #34 on: February 29, 2012, 04:02:59 PM »
Nice job, erniek!  I hope you do well in the 100cc class.  The YZ does quite well there. 8)
'79 IT 250 F x 2
'83 PW 80
'93 DR 350 S
'90 600 Katana

Offline Jock

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Re: '82 Yz 100 Project
« Reply #35 on: April 30, 2013, 01:11:45 PM »
Helmet,

How's the YZ100 going?
Still got the bike?

Cheers

Jock