2001 RM 125 complete rebuild

Hello this is my first post! Woohoo fun stuff. Anyways I'm completely rebuilding this bike from top to bottom. I used to ride a RMZ 450 but its a little much so I got something more my skill level. That being said would y'all recommend a 58 mm piston when I rebuild it? How's the powerband with a fat piston like that? Would I need a new expansion chamber with the 144 cc engine? Ill keep yall posted! I got some cool ideas for the color, plastics n whatnot


 Welcome to the forum! I am also rebuilding a Rm 125 :thumbsup:  I can't help you with the over bore as I have no experience with them. Best of luck and keep the pictures coming!

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