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Discussion Starter #1
I have a 03 400. It runs and drives fine. I have read all the cold start valve issues. This issue seems different. It doesn’t want to cold start ever unless I tilt it on two wheels on its side and then back onto its four wheels. Fires right up then. Ideas?
 

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Sounds like a fuel delivery problem. Cleaned carb? Replaced petcok? Float adjusted correctly?
 

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I haven’t done anything other then run a can of sea foam through it. The previous owner did tell me it needed a new petcok but said only because it won’t shut the fuel off. Think the petcok could be the culprit.
 

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Replace it with one from a raptor660. Get the actual Yamaha part, not the Chinese Ebay knockoffs. Then you’ll have an off setting. Just need to plug the vacuum line that goes to the stock carb.

I would still take the carb bowl off and clean out the Jets.
 
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