hi, U can a chart or diagram for this specific motorbike at yamaha authorised workshop or dealer or manufacture located in your area or just log on to yamaha offical website that might help out much.
I recently rebuilt a 1960's model 350 Jawa 2 stroke twin engine using a later model crankshaft...
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I recently rebuilt a 1960's model 350 Jawa 2 stroke twin engine using a later model crankshaft assembly,with needle roller small end bearings.But the pistons still use the three cast iron rings.My question is,is there an even later model piston I could use with the same piston dimensions ( 58- 59 mm bore)but having two rings,perhaps narrower chrome rings or similar? Ken.