Question about 1997 kawasaki VN 1500 Vulcan Classic

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My 97 classic is smoking at idol, and dumping fuel. Carb has been cleaned and the needleand jets have been changed (we even tried smaller ones). It is dumping too much fuel. When we adjust it, it either runs to lean or too much fuel. could it be a fuel pump problem?

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A plugged Idle Jet will give you an erratic idle (up,down,up,down) and also draw in liquid fuel instead of vapor. The 'O' Ring between the float valve seat and carburetor body and the Float Valve are the only two places the fuel may enter the fuel bowl. If the 'O' Ring or Float Vale is leaking the float cannot regulate the fuel level. To test a fuel pump you will need to test for Pressure and Volume.

Posted on Sep 02, 2010

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Posted on Jan 02, 2017

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I know you have cleaned the carb but ya gotta keep at it. The jets are not the problem. The problem is the little pilot circuits for low and early mid range fuel supply. Varnish or trash in the carb can be very hard to get rid of.

Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Remove the carb and then 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
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< < 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. Before putting the slide back into the carb, move the clip on the jet needle down one notch. Put the rest of the
carb back together and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

Please rate this solution. Thanks!

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