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Yfz450 want start

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I have a 2006 yfz450 it wont start it just cranks it will try to  start sometimes when you roll it off but it is really hard to get it too it has low compression but the piston is fine sometimes when you try to start it off the electric start it will back fire really loud and it puffs smoke out the exhaust when you crank it with electric start aswell but cant get it to start back does anyone know what it could be

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Also never rule out cylinder wash down from excessive cold starts, just dribble a little oil down in the cylinder, let it soak in the rings, fire it up, let it warm up ALL THE WAY and then ride it a little, don't just start revving it. 

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