Bought a china clone piston for a 90 big bore.

[81ATC185S]

http://www.ebay.com/itm/161443920122?_trksid=p2060353.m2749.l2648&ssPageName=STRK%3AMEBIDX%3AIT
I hope this piston works, of course 0 research about if it would work or not was done *lol*.

[YamaBoss]

Wow that's quite a hope. Why wouldn't you just get something you know works.

[HairyJR]

Hope you have access to a lathe, you'll need to machine the piston pin to deck height and dome shape. Maybe even the bottom of the piston skirt. With the 90 stock stroke and the 54mm piston gives you a 104cc motor. It can be done. lol

"HJ" 226949 :beer