I am in the process of rebuilding the top end on a 1992 Polaris 350 Liquid cooled 2-stroke. I do not know the complete history of the machine. The piston reads 35B, would that be the stock size or an overbore?
Normally on the other brands of ATV's I rebuild if it has been bored the piston will have a number such as .25 or .50 for the amount it has been bored over. I am new to dealing with the polaris brand. Thanks for your help.

 

That is the std. bore size, i would guess. the b must be a letter designation the japanese use to mismatch machining tolerances to get the best clearance. That is what they do on the two-stroke dirt bikes anyway. stock bore size is 80mm