Flywheel sheared key - how to fix flywheel fitment
I've got a '99 Yamaha grizzly 600 that I bought not running, found the PO had a valve job done and didn't set the cam timing right so it didn't run- then I got it running and ran it for a minute or so. Was happy it ran, buttoned up the rest of the top end, airbox, etc. and then started, ran for a minute or so, it spit (almost a backfire) and stopped running and wouldn't restart.
Found the crank key sheared off and the flywheel has a little galling from where it spun. The flywheel bolt came off awful easy so I'm wondering if it wasn't tightend down enough when it was put back together also. Also the flywheel has what looks like a step in it on the inside - could it be from the spinning?? OR are they made that way (Do I need to replace it?)
Anyhow - how do I fix the galling? I've heard lapping compound and cleaning it up good, I've heard do nothing, and I've heard put some (name a sealant/glue here) - epoxy, loctite gel, RTV, gasgacinch (?)...
Anyone ever repair something like this??