Question about 2004 Yamaha YZ 450 F

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05 yz 450f will not stay running

Throttle must be held wide open to start. and will only start with choke on, will not idle....if I let off the gas it dies even while riding. feels like i have to ride it like a 2stroke.

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  • gconjamie Sep 26, 2009

    that seems to be ok.. took bike to mechanic at a lower elevation. would that matter. I am at 4000ft above in the High Desert, Ca?

  • gconjamie Sep 26, 2009

    that seems to be ok.. took bike to mechanic at a lower elevation. would that matter. I am at 4000ft above in the High Desert, Ca?

  • gconjamie Sep 26, 2009

    that seems to be ok.. took bike to mechanic at a lower elevation. would that matter. I am at 4000ft above in the High Desert, Ca?

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CHeck if there is any problem with the conetion beteween the carburator and the head

Posted on Sep 26, 2009

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Hi, Anonymous and the usual suspects are:
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Wide open as in wide open throttle?? You mean the engine is racing? Something is wrong with the throttle controls, or the throttle valve in the carburetor may be sticking open. Look down the carb throat. At its base will be the throttle valves-"butterfly" valves just like the choke valve on top of carb. The throttle valve should be closed at rest, or at idle, or when gas pedal is not moved. Rotate the throttle lever on the carburetor by hand (when gas pedal is pressed down, the throttle is rotated). The throttle valve at the bottom of the carb should open and close with the throttle lever.
If the valve is sticking, spray some carburetor cleaner down it, and spray the outside clean, too. Work the throttle back and forth to make sure it is free to move.
For a high idle, have the carburetor adjusted. Timing should be checked, too-that can cause a high idle, but wouldn't cause it to go wide open.
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Kescorpio56:
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