Question about 1999 kawasaki EN 500 Vulcan Classic

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Leaking fuel from somewhere other than Carb.

We have small backfire when downshifting and stalling at stops. Now fuel is leaking from somewhere near the aircleaner. I checked a couple of the fuel emission hoses and that's not it.

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One of your carb floats could be sticking and fuel is going into your airbox, with engine running try tapping each carb, with something like a plastic handled scewdriver. but take it easy

Posted on Jun 21, 2009

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Why is there fuel leaking from a small nipple on the side of our 110cc chinese quad


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Sears troubleshooting


Check for leaking intake gaskets or leaking head gasket

Those issues will draw in extra air, that will lean out the fuel mixture
or prevent the proper vacuum from drawing fuel into the cylinders,
thus the lean backfire

Need to get yourself the spark plug tester with the clip attached
& says for small engines,to test for a strong spark

There is one also that says HEI on the plug
That one is for vehicles with electronic ignition
& plug gaps of .043 thru .060,not for small equipment

If you have a carb with a float,take the carb apart & clean it
with carb cleaner,then green brakleen & install a new spark plug

For the gaskets,you pretty much have to take things apart to check them

A tune-up on small equipment also includes changing the head gasket, as odd as that seems

If you hear your neighbors mower popping as they cut the grass,
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When you clean the carbon off a piston & cylinder head you
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Bike wants to stall out and backfires alot


Hi Anonymous, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals especially the negative cable at "BOTH" ends, ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor or intake seals.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust valve.
For a prime suspect please visit website below.
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I have installed a used carb.,new cap,rotor,plugs,fuel control relay,used dist.The same problem still exists.Under 1000 rpm the vehicle sometimes stalls.It fires back up,sometimes with a backfire and seems...


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My briggs vanguard v-twin 16hp after initial start up this fall started leaking fuel from the carb into the cyl. and into muffler. The jet is seated and not dirty. It leaks somewhere else in the bowl. ...


The solenoid on the bottom is a fuel shut off solenoid to prevent backfiring if shutting down engine with the throttle still open. If you're leaking fuel into the engine, the float is not closing the needle valve in the carb. remove fuel bowl and replace float, and needle valve with seat.Be sure to blow out all fuel passages

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With a good air filter, and a good fuel filter you shouldn't really have any problems since the fuel pump is good. You could have a vacuum leak, this can be identified by using a can of carb. cleaner with the tube attached so that you can spray near & around your vacuum hoses & connections. If you spray near a leaking hose, or a cap, or connection that is leaking, the engine will slow or stall. Only spray a second or two & allow the engine compartment to air out between spraying as it is a flamable product.

Short of that, you could be looking at ta idle speed control motor/throttle position sensor.

Testing the vehicle with a vacuum gauge could assist in identifying any other issues such as exhaust or valves. Gauges usually come with instructions & just need to be hooked to an available intake port.

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the float may b sticking...depending on what type of carb ur running...the spit and sputter problem sounds like you are running a keean carb and if thats the case...there is a extra setting on those that is leaded in from the factory that your average joe doesnt know about...have someone familiar with this adjust it for you and that will help some ...however if itis a keean either live with it or change carbs...that spit you described is just how they operate

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Sounds like somewhere you have a air leak. Most likely it's somewhere near the carburetor intake or maybe the carb itself. Could be a line from the primer if it has one and i do believe it should that could be leaking or loose. Good luck.

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