Well my left pistion broke a ring.... so i going to need to rebuilt my topend...what do u guy suggest...i race Mx...i have Toomeys T5 stock engine..never bore...Give me some ideas..i was thinking about weisco let me know thanks

 

I would recommend a pair of pro-x pistons. Cast pistons last alot longer and you could run tighter clearances because they do not expand as much which equals more HP.I also MX race, I hit the track about twice a week, I change my piston out every 30 gallons of gas. If you stick to this program you can get 2 or sometimes 3 pistons to a bore.