Question about 1987 Honda CBX 250

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Fuel Leak from the Carburetor

I have bought an old CBX250 and when the engine is stopped, fuel starts to drip from one of the drain pipes that comes from the carburetor till the fuel valve is turned off. Looks like the carb gets overflow and the inside float is not working. Any comments.

There is a little screw near the drain pipe what is the function of this adjustment

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  • rehman_habib Apr 24, 2009

    Thanks a lot, your suggestion encouraged me to open the carb and clean it.



    It was too much rust inside the water trap and inside the lower part of carb. The float was ok but the gas leakage was due to loose screw for drainage. Any how it looks ok now. Thanks once again.

  • Dragon May 11, 2013

    WAS THE LOOSE SCREW THE ONE USED TO HOLD THE DRAIN TUBE OR IS THE ONE NEAR THE TUBE? IM HAVING THE SAME PROBLEM WITH MY 1974 HONDA 550FOUR! LET ME KNOW PLEAS AND THANKS IN ADVANCE

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Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

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. Turn the gas back on and wait a minute for the carb to fill with gas. If the bike doesn't start and run properly then shut off the gas and 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. Check the float as they can go bad and fill with gas such that they no longer float. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw 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. The idle speed will probably different so adjust the idle screw to get back to where it was. This process should get you back on the road.

Please rate this solution. Thanks!

Posted on Apr 23, 2009

  • tombones Apr 24, 2009

    Considering you found a lot of rust, I suggest you get and install an in-line fuel filter to prevent the rust from getting into the carb. Also, if the tank is rusting that bad I urge you to get a liquid tank liner. I will include a site below. The liquid liner will seal the rusted tank surface so the rust will not continue.



    Google kreem fuel tank liner “ or go to wwwhttp://www.4secondsflat.com/Fuel_Tank_Se...

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If the engine stops after a few seconds it may not be getting enough fuel. The engine needs air, fuel and spark to maintain operation. The carburetor has two inputs, fuel from the gas tank and air through the air filter. The carburetor is designed to mix the air and fuel in a consistent ratio so that the engine can run continuously. If the carburetor is not getting enough air or fuel, or if the fuel is blocked inside the carburetor the engine stops after a few seconds. Rebuild the carburetor with this carburetor kit.





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