Bikes runs well for 15 or 20 minutes and then the motor dies. No spark. After it cools I can start it again and ride it for 15 minutes or so, and then the motor dies again.
Dealer had the bike and couldn't diagnose or fix. Any ideas? I thought perhaps it was related to the cooling system since the engine dies about the time the fan would come on, but I'm not sure how to check that.