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Fuel draining out as soon as filled

Hi I have a 2007 YZ 250 (2 stroke) motorbike, when I fill it up with fuel it drains straight out under the bike, someone said it could be the flow valve im not sure. How can I fix it??? Thanks soooo much for your assistance I really appreciate it...

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  • condo_777 May 13, 2009

    Thank you very much tombones49, I really appreciate all your help now to go and give it try. Thanks again



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ALWAYS have a fire extinguisher at hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

This is a carb float being stuck open.
Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Next, turn the gas back on and sharply tap the float bowl with the plastic handle of a screwdriver as the fuel bowl refills. The goal here is to vibrate the float to free it up. If doing this process a couple of times doesn’t free the float and fix the overflow problem, remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the
carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

Please top rate this solution. Thanks!

Posted on May 08, 2009

  • tombones May 17, 2009

    I went on a Alaskan cruise on 8th thru 16th. Would have responded sooner but had no email access. Is the problem fixed? Change to a top rating if all is well. Thanks, tombones49.

  • tombones May 19, 2009

    So is the problem solved now? A top rating is what I am looking for!



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