125 WR 1980 to 82

thanks a lot Fred!

and another question, Fred. I can buy this Mikuni carb, is a 34 and is made to work inclined, that could be good on the 125 (I think). What you think?
Some other has any experience?

i don't know about the mikuni
have put a keihin pwk and it was great
@+fred

race in auroux august 2017
@+fred

so clean fred, how do you do it?? i only have to start the bike and im covered in gunk

new dress for the bike and upgrade to a 175 XC
@+fred

nice Fred, looks great

Fred,
They are beautiful in all their colors! I just purchased an 82 175. So, knowing the 175 parts are rare, and that the 82 and 83 parts are not identical, can you please post details of how you went to a 175? Gotta start somewhere, so here is the sickly patient...

hello picklito
the pipe is from a suzuki RM 78 modified to fit the hva frame (very close from the 1983hva pipe)
i have also the 83 with 83 hva pipe, a little bit different ;well tuned with the cylinder
the cylinder is a 125 82-83,(cylinder 175 is the same with a 175 liner;same porting....)
adjusting a new liner 175 to the 125
adjusting the porting
jeff bens have requested to wiseco the manufacture of the good pistons (64,75-65-65,25)
put an hpi ignition with variable advance
a great offroad bike maybe the best!

amazing!!!
someone have the info for the pipe?
@+fred

yes me !

I did some checking for pistons and found this: KTM 200 64 mm STANDARD SIZE. If the piston meets the specs with trimming or cutting windows, the cylinder can be Nikasil coated and sized to clearance over the piston. Also found the piston for the kawasaki KDX 175/200 is 66mm. I personally have found the 86 KX250 I replaced a piston in meets size for size against a Husqvarna 250 piston. Some expense required but either could make the 175 option work. I found a test on the 1983 175XC & WR but it is not in the collection just posted in the vintage section. Anyone who needs it is welcome to pm me and send me your email so I can send it. It is over 2meg so I can not upload here.

The test also has a sidebar about what Mitch Payton did to fatten the powerband but no specs on the porting changes.

UPDATE: The test is now in the collection mentioned above. I emailed it to the owner. I will be sending him Husky Club Newsletters and all the parts catalogs and shop manuals I collected over the years.

race in france octobre 2018

nice pic, barely seen a puddle ...yet

And ???

jemco usa
@+fred

The KDX175/KTM200/IT200/YFS200/YFZ350 pistons all use 16mm wrist pins, where the Husky 125 (like everyone else's 125) uses a 15mm wrist pin.

If you can save money getting someone else's piston reliably, what's the cost of a conrod to take a 16mm wristpin with needle bearing? The price you pay for an obsolete piddler. If I were to build a 175, I would want a bigger wristpin than a 125.

I don't know exactly what is the size (inside) of the HSQ 125 connecting rod; it should be 19 or 20; if it is 20 is possible to use a 16mm Pin piston just with a needle bearing (piston bearing) of 16 mm inside and 20 outside ( https://www.scafutopistoni.it/gabbi...ulli-spinotto-pistone-16x20x225-speciale.html );
if it the outsde is 19, with a needle bearing (piston bearing) 16mm inside and 19 outside ( https://www.jawaparts.com/Connecting-rod-bushing-16x19x20-Jawa-350-d2921.htm )