250-500cc 300 PISTON

WHAT BRAND ARE YOU GUYS USING? LOOK'S LIKE VERTEX IS CAST. IS STOCK HUSKY CAST OR FORGED? I PREFER FORGED.

As far as I know the only piston available is the OEM (Vertex) piston, which is a quality piston. The Wiseco Gas Gas 300 piston fits, but doesn't perform well in a stock motor. At least it didn't for me.


It just so happens I have a brand new OEM 300 top end for sale (selling my 300 and dont need it anymore). I also have a super low use GG 300 piston if anyone wants to hot rod their motor. /sales pitch over/

Its a domed piston. Too much compression for the stock head, I think.

Did you try WOSSNER? I'd call them and see what they can do.

Don't do the GASGAS piston. Nothing but trouble.

PM me if you can't find anything.

WISECO DOESN'T OFFER A PISTON FOR THE 300 WHICH SURPRISES ME AND I'D LIKE TO HAVE A WOSSNER BECAUSE THEY DO ABC SIZES. I HAVE AN EMAIL INTO WOSSNER AWAITING A RESPONSE.

The right way to swap to a domed piston would require reshaping the head's squish area to match the dome. If that's not an available option I'd stick with a flat top.

Oh, definitely! I didn't mean to imply that's the ONLY thing that must be checked when swapping a piston.

Are you running a race head?

Yes, the real issue is around the skirt. PC and others tried the GASGAS piston because it was domed and there isn't enough meat in the stock head to make it work as a full blown race motor with the flat top. But, the GASGAS skirt is designed to run in a case reed motor and the skirt is just wrong for the reed induction cylinder. That's why the race head came about.

STOCK

I'M CONVERTING FROM 250 TO 300, JUST BOUGHT A CYLINDER,HEAD AND EXHAUST COVER IN THE CLASSIFIEDS FROM RANCHER1 FOR 350.00 I ONLY HAVE TO BUY THE POWER VALVES ,SEALS, AND TOP END. CAN YOU SAY SCORE! THE CYLINDER ALONE IS 880 FROM HUSKY.

OK, I see. SCORE!