Got my WR450F a week ago. Broke it in and then went on a 50 mile ride. At the 44 mile mark, went to start it and it was dead.Starter would not engage, and it would not start with a tow!! Turns out I sheared the flywheel woodruff key and the nut backed off. Waiting for parts from Yamaha. Has anybody else had this happen? Worst part was my buddy had to tow me 6 mi. with his 525sx KTM!! Everything else is bitchin.