Question about 2003 Yamaha V Star Classic

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I have a 2003 vstar 650 and when i give it a lot of gas it dies. I have had a mechanic clean the carbs very exstensivly but it is still doing it we cant figure out the problem.

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Check your float levels. At one time Yamaha Grizzleys had a problem with the float needle plating coming off causing the floats to stick. We had to put K&L aftermarket float needles in for two years until Yamaha decided to address the problem. They still may not acknowledge it. Also check the choke mechanism carefully just in case it malfunctioning during high vacuum/acceleration conditions. If the carb uses choke plungers make sure the rubber is in good condition and the mounting nuts on the carbs are not cracked.

Posted on Aug 23, 2010

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  • jrjarnag Aug 25, 2010

    The float levels were fine. the bike is running fine except at high throttle. I replaced the carb rubber mounting flanges and o rings for them as well as the plugs and fuel filter. it seems like the gas flow just cant keep up with the high revs causing it to die when it is revved up. the bike is drivable below 1/2 throttle. i was thinking i need to replace the fuel pump does this seem reasonable?

  • David Belcher
    David Belcher Aug 25, 2010

    Try filling your tank with gas and hooking the fuel line directly from the tank to the carburetors. This will bypass the fuel pump and hopefully confirm what you may already have figured out. It sounds like a reasonable fix if it woks the only thing unreasonable is the price of the pump. If this is what you need you may be able to get a discount at

  • jrjarnag Aug 26, 2010

    So i fired the bike up today and it started running fine without doing anything to the fuel pump took it or a ride it ran great but thanks for all of your advice


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Its the float level or the needle valve is dirty or could be bad or sticking my 04 650 classic was doing the same thing it was the combo of the two ethenol gas will cause the rubber end on the valve to deteriate over time get ethenol treatment for your bike to keep this from happening again once you fix it the carb gaskets are high if you reuse them soak them in oil to swell them up to keep the carb from leaking

Posted on Jan 14, 2013


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