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MODERATOR X
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You messed with the timimg somehow and have to get it back right. See if the marks on the alternator stator line up with the marks on the case, and cylinder no.1 exhaust valve should be shut (that's the way it was on my '80 Vision), it's in your manual somewhere.
 

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MODERATOR X
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5,449 Posts
Ah, the Yamaha 490, what a faithfull steed. Just jet it fat, keep the air filer clean and it'll run forever. Don't listen to those nattering nabobs of negativity that say the 490 was a turkey, nay, a wonderful experiment paid for by the public! Here, take a looksee

The Yamaha YZ490 - Motorcycle.Com
 
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