Author Topic: Importers special: road legal YZ125L from Finland  (Read 386 times)

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Offline McPaavola

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Importers special: road legal YZ125L from Finland
« on: July 22, 2018, 08:53:43 PM »
As you may know, we Finns are somewhat crazy people. If we can't get what we want, we propably go and make it. Story about road legal YZ enduros follow this phrase.

Back in mid 80's, Finnish Yamaha importer Arwidsons employee and race rider Harto Helin was somewhat frustated. IT250 and 490 had left the market and modified IT200's suffered all kinds of problems and lack of power in Finnish enduro events. At the same time Husqvarna and KTM 125's dominated same events. Yamaha didn't have these kind of road legal missiles, back in the day enduro bikes really had to be fully road registered to enter enduro events with on road sections. So he came up with the idea of converting YZ125's to enduro bikes. In those days, laws were looser about registering rules and with backup of Arwidson, Harto and some other guys converted about 100 125's in Hartos garage. Bikes were competitive and were used regularly to early 90's. After career, most bikes unfortunately got into wrong, mostly young hands and literally fell apart. You can easily found 2000's YZ with 84-85 papers and frame number for sale. Few have survived in original shape and I managed to find one.



This is how it looked when I bought it. It had sat in the garage from early 90's after it had lost spark. It still had ice spikes mounted on the wheels remaining last rides. You can notice heavy dust cover all over the bike!


Typical K-L engine. Nothing fancy here. Only lots of dust.


Two holes and darkened area in the swingarm reamains about sidestand. There was U-shape plate bolted where Husqvarna stand unit were welded. I have picture of it so I can make replica in the near future.



Details of the rear end. Rear subframe has extra curve and some reinforcements to carry enduro type rear mudguard. I think guard is from Husky/KTM. Silencer is changed too, I've heard it's made by Micron.


Light switch is from DT125LC. Front light is typical Acerbis Elba unit.


And here is the weak point. Motoplat Mini6 ignition. Back then this and the SEM units from KTM/Husky were only choises to get ignition with lighting. What I know and have heard is these Motoplats were worst of all. Later bikes with SEM ignition were far more reliable.


Bike after wash. Much better in overall.

After wash, I removed old ignition. At the end of June, I bought 1985 N-model for spares to my 1983 crosser and it came with brand new HPI ignition kit with lighting coil. Surprise was huge when I tried HPI flywheel on the crankshaft. I didn't fit at all! KTM/Husky flywheels have bigger cone than YZ's. First bikes had sheet of metal bend to a stuffer cone beetween flywheel and crank. It was soon find to be poor system as flywheels slipped quite easily. After that some bikes got right half of crank from DT125LC slightly modified and some halves were filling welded and then machined to fit with new flywheel. This one had welded halve because DT flywheel didn't fit too. Luckily I know machinist who measured cone from old Motoplat flywheel and replicated it to the new HPI one. Problem solved.

After fitting new ignition, cleaning carb and adding some fresh gas, heavy kicking and some pushing the bike woke up from over 25 years of sleeping!

This is how it looks today:



Things I've done so far:
- Front end changed from 1985 model with disc brake. Old dual leading brake goes to my 1983 YZ.
- Rear fender is hanged to Acerbis Baja. It gives little bit lighter look for the bike.
- New crankshaft oil seals and gearbox oils. Cooling liquid changed too.
- New grips
- Spikes changed to some used knobbies. I have set of new Pirelli Scorpion MX's waiting for installing.
- Side panels cleaned from several coats of paint and number plates painted by black rubber paint. Right panel crack glued

Aaand some other little things.

Bike feels nice. As we know 1984-85 motors are quite asthmatic but it works pretty well in the woods riding. It's amazingly strong and power delivery is smooth. I think modern ignition helps too. Bike is easy to handle and suspension works nicely in the enduro riding. I think Yamaha made accidentally enduro bike when they wanted motocrosser. ;D

I have some missing decals on their way, seat cover needs to be changed and suspension needs some service. I have plans to use this bike in cross country events and maybe I test it in some VMX events too. But we'll see.

Thanks,
Antti
"There are two kinds of motorcycles. Yamahas and almost Yamahas"
DT200WR '94 | YZ125K '83 | YZ125L '84 enduro | TZR250 '90 | RD125LC '86

Offline 4V5

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Re: Importers special: road legal YZ125L from Finland
« Reply #1 on: July 22, 2018, 09:15:03 PM »
what a cool bike! Great score and great to see it being fixed to be used  8)
IT465x4 IT400C IT175F IT175G YZ465G YZ250C YZ250WR RD350LC RD250LCx5 DT175Nx2 TW200x2 DT200L DT200R RT3 GT80F YZ80L PW50J KH250B1 PE175C TS250ER TS185ER AG175B AG100

Offline Martin I Henry

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Re: Importers special: road legal YZ125L from Finland
« Reply #2 on: July 23, 2018, 06:49:07 AM »

Excellent find Antti,

Fantastic bike, great topic.

Cheers,

Dave.

Offline Cooky375

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Re: Importers special: road legal YZ125L from Finland
« Reply #3 on: July 23, 2018, 11:21:27 AM »
Antti, I bet that is a lot of fun to ride. Good find and save.

Offline McPaavola

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Re: Importers special: road legal YZ125L from Finland
« Reply #4 on: December 31, 2018, 10:46:14 PM »
New year's update.

I've been riding with this thing a lot. Works like a clock.

I slightly polished gas tank and added '85 decals.


Found undrilled airbox cover from eBay:


After some polish and paint:


Self made sidestand:


Took it to our local track too after rear shock and front fork rebuild. It was... Slow. ;D


I found aftermarket pipe from eBay. Not really sure which brand it is. It really gave new life to motor. Revs and pulls nicely now.


And bike as it is nowdays with spike tires. I have changed that 44 tooth rear sprocket to 50 tooth one.


Thanks,
Antti


"There are two kinds of motorcycles. Yamahas and almost Yamahas"
DT200WR '94 | YZ125K '83 | YZ125L '84 enduro | TZR250 '90 | RD125LC '86

Offline Martin I Henry

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Re: Importers special: road legal YZ125L from Finland
« Reply #5 on: December 31, 2018, 11:39:55 PM »

Nice work Antti.

Have a great 2019!

Cheers,

Dave R.

Offline 4V5

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Re: Importers special: road legal YZ125L from Finland
« Reply #6 on: December 31, 2018, 11:48:22 PM »
Thanks for sharing the progress! what a sweet bike  8)
IT465x4 IT400C IT175F IT175G YZ465G YZ250C YZ250WR RD350LC RD250LCx5 DT175Nx2 TW200x2 DT200L DT200R RT3 GT80F YZ80L PW50J KH250B1 PE175C TS250ER TS185ER AG175B AG100

Offline storie585

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Re: Importers special: road legal YZ125L from Finland
« Reply #7 on: January 01, 2019, 12:43:49 AM »
Love it. Very cool!
Dave

Offline keny

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Re: Importers special: road legal YZ125L from Finland
« Reply #8 on: January 01, 2019, 12:44:18 AM »
I do wounder why not Yamaha IT 175/200 ignitin was used back then? Why Motoplat? Both 6 volt systems.

But good it works now!
In Garage, Yamaha?s: -83 IT175, -86 IT200, -81 IT465, -89 + -90 XT600Z,
Honda?s: -86 VFR750F, -97 CR125R,