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The power valves knock, when the bushes wear. But the valves also seem to wear aswell. Also the right hand power valve cap isn't a great design, having only one fixing point. Probably why Yamaha changed the design of the power valve on the 4fu cylinders.
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The only potential issue I can see is the clutch side crank bearing is a slip fit to the crank it can be dropped on and pulled off the crank without any force what so ever does anyone remember if that's normal for the clutch side to be a slip fit
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Nether of them should be that easy. See if that bearing slides easy onto the other side of the crank. If it doesn’t then the clutch side bearing journal is worn...
If so you could try using fully hardening bearing lock. Like the Lockheed thread lock stuff... -
@spookdog I tried one of the old bearings that I removed and that was the same, the bearing locker probably won't work it's only meant to stop spinning bearings this has lateral load so I'd imagine it would last a few seconds and then fail I'm gonna grab a used crank I just don't know what one to get some say the stroke used to be shorter but I don't know
