Major step backwards today,damn it! Did a leak down test and brand new crank seal is leaking on transmission side.This seal came with the Hotrods stroker crank,I was never really happy with the "feel" of that seal. I detected some clunking in the trans once the motor was bolted into the chassis and found the mainshaft [main axle Yamaha calls it] to have a less than perfect bearing.Item 10,which did not seem available through Yamaha,but did some homework and it looks like a 6204RS bearing.So I have some rework to do. I think the previous owner ran mud for transmission fluid.
This is some of the evolution of my 1978 Yamaha XS500 over 35 years.This past summer I sold off all the 8 valve twin engine parts and bought a hammered up '92 Blaster just to get the engine out of it.I am in the process of a full engine rebuild with Hotrods stroker crank,Wiseco piston and outer clutch basket, my own porting,Barnett clutch springs,VForce4 reeds,my own intake manifold with a Mikuni TM36.My buddy is doing the bore and squishband head. Next up, motor mounts in the bike chassis.And some engine pictures........
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