Not sure if my problem was the same one you had but here’s what happened. Strange noises coming out of the flywheel cover when starting the bike. This was over the course of a weekend. Sunday morning the motor locked up while trying to start it. I have had it in twice for the flywheel fix. First time it broke the woodruff key the second time it bent it enough to not start. With it having broken twice I took it straight to my dealer. They called me and informed me that the bolt or bolts going through the flywheel into the starter gear had backed out and ground up the coil and chewed up $350.00 worth of parts
. I told them to call Yamaha
As I was very upset, having switched form a KTM520 that I was very happy with but felt that I needed to try something new. The dealer was quick to point out that they had not removed these bolts when they did the flywheel fix. I, myself have not looked that closely at the relationship of these bolts and the flywheel but friends that have tell me you do have to remove these bolts. They said Yamaha
was quick to approve the warranty request. It must be more common than they would like to admit. If my suspensions are correct it could be a mistake made by several dealers when they performed the flywheel update! How many guys have had this happen to them???????