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I am having an issue with the Raptor starting and staying running. It will crank, get ready to start, idle for about 1 second and then die. This will only happen on cold starts... strange thing to me is it will start and idle perfectly if I turn the headlights on. But as soon as I turn the lights off.. sputters and dies. So I have just been letting it warm up for about 5-6 minutes with the lights on then turn them off and ride.

This happened after picking it up from a local yamaha shop after they adjusted my flywheel I believe. I have looked this quad over almost daily trying to figure out what it could be. Anyone else have this issue? Or maybe just an idea where to start? Thought I would ask here first before ripping the whole thing apart. Sounds kinda like a ground to me or something electrical... ?

Thanks!
 

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You would actually be surprised how much of a difference just the 2 points in octane rating will make on the cold start issue. or try throttle position sensor replace.
 
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