kjh Posted August 29, 2011 Report Posted August 29, 2011 I bought a new bike and am doing a frame down build, thought I would rebuild top end while motor is out (first time) plus it had a leaky gasket. I was told this is a 7mm crank, I confirmed it has Twister crank, not sure if that is good or not? The cylinders look good so I was just going to hone them(motor ran good when disassembled) I can't figure out the size of pistons the number on the bottom says "W664" the number on the top was tough to read but I think it is "S50 520F 5 6850" there is a number above this one that reads "20503" Anyone know what size they are? The cylinders look to be sleeved, are these sleeves borable it looks thin? Quote
BANSHEE HP Posted August 29, 2011 Report Posted August 29, 2011 sounds like a wsm piston 68.50mm Quote
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