try KBR maybe
thats why makes the nmotion piston i have... i guess i can just order new rings for it. ive just heard mixed feelings on them in 4 stroke applications.try wiseco, i know the big bore kit they sell for the crf uses a cp industries cylinder(n-motion) and it's a 101[/b]
Sparks racing carrys cp pistons in that size if you need one more option!!sweet, thanks[/b]