Question about Yamaha WR 450 F Motorcycles

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I have a 2003 Model Yamaha WR 450. The bike has been sitting for some time now and trying to get it going again. The problem I am having is that when I start it the bike is getting very hot very quickly (To the point the exhaust starts to glow red) and then it back fires badly. Can you please let me know what the possible causes could be and where to start. Thanks

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  • torben481 Jul 30, 2009

    I am not sure re the exhaust. I can remove it and see how it runs without the exhaust.


    The timings has not been touched since it came from factory and bike has done virtually no mileage.


    Is there any chance it could be running too lean? Maybe problem with jet or fuel setting?


    Rgds

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Is the exhaust blocked?? Has any timing adjustments been made to the bike while it was laid up?? It really does sound like the exhaust is blocked causing the fumes to build up leaving unburnt fuel in the pipe and then the fuel burning the pipes. Ian

Posted on Jul 30, 2009

  • Ian Percy Jul 30, 2009

    But if it`s not been touched since you laid it up, I wouldn`t touch the fuel system, they`re a nightmare to reset, believe me. Ian

  • Ian Percy Jul 30, 2009

    Have you tried new fuel, the old fuel will have gone off now. Ian

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