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Spark doing my head in..only sparks when flywheel spun in opposite direction?

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Please stop my nightmares, yamaha DT200R 1993, no spark on kick or roll start. But when the plug is out and the flywheel is spun in the opposite direction to normal, it fires the plug each and every revolution? I'm stumped....any help or even any suggestions no matter how strange would be greatly appreciated.Even wild guesses will do...cheers

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Sheared Woodruff key, allowing the flywheel to spin on the crank?

 

Didnt think of that but I'll check, I have had the cover off and seems tight as buggery but I'll rip the nut out n have a look...cheers :)

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