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#9020
Jay
Participant

I had a Yamaha YZ that behaved this way… it turned out be that the flywheel woodruff key had sheared and the flywheel was slipping on the crankshaft. About once in 25 tries the motor would fire but as soon as I tried to rev it the flywheel would slip again causing the timing to change. The engine would stall and refuse to start for another 25 or so attempt until the flywheel happened to slip into a close-to-correct position.