Posted July 14, 200916 yr well my cylinder is 70mm bore but the piston is stamped 0.50mm and the #1 or 4 followed by 52p2 is stamped at the top. I have sent for a new 70mm piston, but wanted to know were this other piston is from. any ideas???????
July 15, 200916 yr Those numbers dont sound familiar to me but if it has a .50 on top it should be 1/2 mm over bore,or 70.5mm. A 70mm piston will be to small now.
July 15, 200916 yr Author my mic says its 70mm,and the mic doesn't lie. The thing is the piston in it now appears to have about 10thousanth slap on the skirt end, and on the top. So i cant help but think this was never the right piston in the first place. Also when i got this bike i tore the top end off only to find the piston in backwards .
July 15, 200916 yr Author ok so i got the 70.5 mm from wiseco, this way i can hone it out and make sure it gets a nice cross hatch. wow these are spendy
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