Drastic
This is the bearing behind the gearwheel for the camchain, just to make sure ...
It should be press-fitted, so if it has movement, there is a problem. Installation with Locktite not recommended, this will not handle the forces on the bearing.
Three options:
- Yamaha sells this part of the CS complete with bearing and gear - probably very expensive
- A second hand CS, and overhaul it (bearing, big end (conrod)) - the gearwheel CAN be removed and re-installed
- Weld-on the missing metal and get it grinded to the correct dimensions - I think this might be the cheapest / easiest way to go, although picking up a second hand crankshaft cannot be that difficult either, they almost never break ...
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