Question about Yamaha YZ 450 F Motorcycles

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I have an 07 YZ450F, it runs great until it warms up then it starts back firing, bogs and doesn't want to stay running. I checked the vavle clearance, timing and both are good. What else could c

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Carburation! If the air/ fuel mixture is not carefully adjusted by the choke system after warmup it will do just what you describe...check it out!

Posted on Jan 12, 2013

  • Ryan Mooney Jan 12, 2013

    Yes, i also adjusted the air/fuel screws to factory specs when i did the valves. Could it be a bad coil?

  • Leigh Perlmutter
    Leigh Perlmutter Jan 12, 2013

    Could be! If it gets hot it may be partially shorted out.

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