'82-'83 175 pistons...long story.

fredHVA79 · Oct 26, 2016

and the bike

Michel Dufayard · Oct 26, 2016

Your piston doesn't look like a Mahle one.It is very new. What is the factory which did it ?

Kartwheel68 · Oct 26, 2016

So HVA have 83 175 pistons? Looks like a Wiseco piston to me, which is fine.

fredHVA79 · Oct 26, 2016

i don't know who is it from.
i will ask the seller.
@+fred

justintendo · Oct 26, 2016

fred, this bike and your other older smallbore both look awesome. nice look with a nice patina that shows use. that looks like a wiseco for sure

Joe Chod · Oct 31, 2016

Fred
Have a couple 83 175's.

What do you need to know about the head?

Please be specific so I can provide the info.

Joe

fredHVA79 · Oct 31, 2016

hello joe
could you compare the 175 head with the 125 and tell me, what are the differences.
many thanks
sincerely
@+fred

Kartwheel68 · Oct 31, 2016

82 kit cylinder or 83 production cylinder? They are not the same.

fredHVA79 · Oct 31, 2016

hello kartwheel
i don't know what i have
have you seen the pictures?
what do you think it was?
sincerely
@+fred

Bigbill · Jan 24, 2018

I purchased most of the parts for a 83/175 but missed bidding on the engine. Such a big frame for a little engine.

overload · Dec 7, 2018

Hi Kartwheel68, may be only you can help...

I have a 175 1983 cylinder that I want to put on a 125 engine (1982).
The cylinder has to be rebored because of rust. I don't have old piston. The problems are:
1) I have only the 125cc Head, and I ask you, if possible, which are the differences with the 175 1983 head.
2) I don't have the piston, and I am looking for some alternatives (you suggested yamaha Banshee, RD350, and I've found also Piaggio Hexagon 180 or Yamaha IT 175 could be one), and I am asking you if you can mesure the compression height of the 1983 piston to find one similar. About the problem of the 15 mm piston pin (these alternatives are all 16 mm pin), I think that there could be a solution: Yamaha on his YZ125 around 2000 passed from 15 to 16 piston pin, but with the same rod; the only difference is a particular top end bearing that is 16 inside and 20 outside ( https://www.scafutopistoni.it/gabbie-a-rulli/2894-gabbia-a-rulli-spinotto-pistone-16x20x20-mm.html ) and could work.
Please let me know.
Thanks
Stefano

Kartwheel68 said: ↑

This is a synopsis of my almost 2 year search for parts and information on the '82 Husky Products 175 kit pistons and the '83 production pistons.
In Dec '10 I bought an '82 XC125 that had the entire Husky Products 175 kit. As many know, the 175 kit included a pipe, cylinder, head, exhaust manifold, and a cylinder base spacer plate. The large oval intake holes on the '82-'83 (and probably up to '86 which was the last true Husky 125) piston makes them easy to identify, no other piston looks like it. I have bought 10+ '82 175 pistons on eBay that were either not labeled as for a specific year, or mislabeled as for the '76. The piston sizes are confusing though. The stock bore for the '82 175 is 64.75mm but all of the pistons I have stamped "cs" on the top indicating stock size are far too small, like .5mm or more too small. I have an unused NOS '83 175 cylinder so I know for certain the bore is stock, but these pistons can NOT be for another bike, they are too small for the '82, but are definitely not for the '76 175 which had a standard bore of 62mm and the '76 wrist pin is bigger than the '82. I have some pistons marked 64.88mm which are marked as 4th over, that is closer to 1st over but a 1st over should be 64.96mm not 64.88mm., yet they are identical in every other dimension to the piston that was in the '82 kit cylinder when I got it. I now have 5 of those 64.88mm pistons, and my '82 kit cylinder needs to be bored so I am thinking of sending it to Lancort or somewhere else and have it nikasil coated to that size. 4 OEM Mahle pistons should last me a lifetime of Vintage use as long as I keep the air filter clean.
Last month I bought an '83 WR175, the production bike. There are some interesting differences in the kit parts and the production parts. When I first looked at the bike I was a little bit concerned that it did not have the base spacer plate, I was worried I had bought a 125 that was claimed to be a 175. I popped the head off and measured the bore and it was indeed a 175 at stock size. Obviously the '83 piston had to be different than the '82 kit piston if it did not require the spacer plate, the wrist pin compression height had to be different, or the rod had to be shorter. Since Husky treated the 125/175s like step-children I suspected a different piston over a different crank/rod. I was in a hurry to get other bikes ready for Unadilla so I didnt take the cylinder off. When I got back from Unadilla I popped the cylinder off and the '83 piston is indeed much shorter with a pin height closer to the crown. The '83 cylinder does not use the larger exhaust manifold like the '82 kit either, it uses the same size manifold as the 125. Another interesting difference in the kit top end and the '83 production top end is the iron "lip" at the top has a larger outside diameter on the '83 than it does on the '82 so that the '82 kit head will not fit the '83 cylinder without either the liner or the head being machined. Since I have both a kit head and an '83 production head I wont have to do that, but its interesting.
At Unadilla I talked to Husky Guru Craig Hayes and he said the original Husky Products 175 piston was an off the shelf piston from some other brand and model of bike, Husky did not make it. The piston they used for the STD size of the kit was actually the unknown bikes 1mm oversize, which explains why the pistons I have with .040 (1mm) in the top fit the NOS '83 cylinder I have.
I am glad I discovered that the '83 piston was different and allows the use of the 175 cylinder without a spacer plate. I will still have some 175 pistons made, but I will send the '83 as an example instead of the '82 so that anyone wanting to build a 175 will not have to find, or have made, a spacer plate.
Brian

visiteur1948 · Dec 7, 2018

visiteur1948 · Dec 7, 2018

overload · Dec 7, 2018

Thanks Claude, datas really usefull!
Now I hope someone can measure the compression height of the 1983 175 standard piston (the distance from the piston pin to the top of the piston).
Let me say good luck to Stefan Everts in adifficult moment!
https://mxvice.com/98668/hospitalised-stefan-everts

fredHVA79 · Dec 7, 2018

hello overload
see the post
@+fred
http://www.cafehusky.com/threads/1983-125xc-big-bore.85498/
http://www.cafehusky.com/threads/125-wr-1980-to-82.78773/page-2

Kartwheel68 · Dec 9, 2018

The Yamaha YZ125 has always used a 15mm wrist pin, so I am not sure what that wrist pin is for. Fred has said that Jeff Bens has pistons, is there a contact info for him?

Krudd · Dec 9, 2018

jefbens@skynet.be

Picklito · Jul 28, 2021

I'm ready to send my '82 HP-kit cylinder and piston out. I don't seem to be able to find stock piston clearance. Anyone?

Picklito · Jul 29, 2021

I emailed jemcoexhaust@gmaii.com and they are still able to make the pipes and silencer.

Michel Dufayard · Aug 23, 2021

You mean that HP pipe ?

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