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puch metrakit pistons! yeah! stock size is 43.5mm if you just need to replace a worn one, or if you have some serious gore and ya need to bore go up a size...or two..or three..and watch your cc delicately increase from 65cc to 66cc, wow! keep in mind with any other than the 43.5mm stock size you will have to have your cylinder professionally rebored or if you are a bad dude you can try to do it yourself, bearing in mind if you mess it up you wasted a lotta cash. you should be able to find someone to rebore for like $20 to $50 or so, just make sure they have experience with this type of thing and take careful measurements of both your piston and your cylinder so all is cool. these pistons come with piston, rings, wrist pin, and clips. 4 sizes in all, some in stock, some not!
50mm - long
26mm - top of piston to center of wrist pin
26.5mm - bottom of piston to center of wrist pin
if there's no sizes in the drop down menu. that means we're out for week or so.
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Piston Power 
