Question about 1996 kawasaki VN 1500 Vulcan Classic

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Fuel leaking out of carburettor thru air intake valve

I turn on fuel, try starting bike but floods, fuel runs fast thru carb and out of air filter . took apart carb , needle seating ok and float seems to be functioning ok too. also if fuel is turned on without trying to start , same happens ..

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If this happens immediately after the fuel is turned on and your float and needle are known good (Check float by dropping float in fuel, check needle by holding closed and putting air or carb cleaner in fuel inlet.) then, your float height is incorrect. If there is a drain at the bottom of your carb add a clear hose and put fuel to fuel inlet on carb. Open the drain and check your fuel height (bring the hose above the carb making a J shape). On my keihin carb it is about at the bowl split line.

Posted on Apr 15, 2014

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  • 245 Answers

Try screwing the bolt of the fuuel holderr in the carborator, whhichh is generally used for overflow, screw it tight ,

Posted on Apr 15, 2014

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Posted on Jan 02, 2017

  • 53 Answers

SOURCE: Just went to start after winter blowing gas out the air cleaner.

sounds like the needle and seat is not sealing.It is a common problem when bics are stored over winter.Either remove carb and clean nedle and seat or replace to be sure.

Posted on Mar 24, 2009

goofduck
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SOURCE: 1998/99 kx 125 fuel leaking from carb outlet at bottom

sounds like the needle and seat may be the problem

Posted on Apr 15, 2009

DoubleClutch
  • 376 Answers

SOURCE: Air box and crank case fuel flooding problem

Well there only one way the fuel can get into the crankcase and that's from the fuel tank. The petcock must be draining and the float needles are not stopping the fuel flow. Do you have a prime position on the petcock? If so do not run the bike in the position. Try topping the tank off with gas and letting it sit for a while and see is the gas has gone down and then check the crankcase and see if there's fuel in it again. i still say its got to be your petcock.

Posted on Sep 29, 2009

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SOURCE: I had a fuel leak from carb. Took off Throttle

For Float setting try about 26 mm using std main and idle jets

Posted on Mar 24, 2010

nedkelly900
  • 345 Answers

SOURCE: Replaced diaphram fuel valve and carbs ..cannot

I would say the problem is in your carbys, with the float levels, or a sticky needle and seat. If you open the fuel valve, fuel will flow into the carbys, ans shut off once the correct level is reached. I think the problem is in your carbys, not the fuel valve. I would remove the carbys, take the bowel off the bottom, and check the needle and seat, and float levels. It is not recomended to change the float levels from standard.

Posted on Apr 27, 2010

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I was riding my bike and came to a stop it shut down and started to leak gas out the air intake now it will not start. What do I need to check to fix this issue


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The carburetor choke valve might be stuck open or not closing when the engine is cold. The engine needs a richer mixture to start. Too rich a mixture (flooding) can also cause trouble. Turn the fuel valve off to be sure the carb isn't leaking when not in use. If it smokes black on startup, it's flooding. Also check the condition of the spark plugs.

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I'm curious what you mean by a "plastic" cam?
Do you mean the breather valve in the cam chest cavity?

You said you, "replaced all the gaskets around the intake ventricle"

How are the seals where the intake manifold meet the cylinder heads?
These are notorious for leaking/sucking air.
Even if you twist the intake manifold (like trying to wrestle the carb off the manifold) can tear these seals, causing them to leak.

While the engine is at idle (or as close as you can get and still maintain it running) spray some of your carb cleaner around these areas, and see if the engine speed changes, indicating a leak.

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I had to read this TWICE.. your Needle / Seat are not seating properly and although you believe since it has been replaced it could not be the reason, it probably is.

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Had a flat battery, tried to push start for a while but did not start.replaced battery, now fuel seems to leak from air filter body when try to start, still no go. is this flooded and how to unflood?


definately flooded
not sure of your model but if it has a vacumn fuel tap there is no OFF position
you need to drain the carb bowls with the small drain screws at the bottom, and make certain the air filter element is not full of fuel, and check the oil is not overfull due to fuel contamination.then try and start with full throttle. Do not run the bike with fuel tap in PRI position or it may flood again

If it has an off position on fuel tap
check air filter
check oil
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Apr 07, 2011 | kawasaki ZZR 250 Motorcycles

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Sounds like a vacuum leak is leaning out the mixture....check the intake between carb and engine for leaks...another source may be tjhe crankcase seals are leaking.

Mar 31, 2011 | 2000 Yamaha DT 125 R

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When turn on petrol and kick bike, petrol is running out of overflow pipe on carb and bike wont start, and bike sounds flooded.


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Mar 23, 2011 | 2003 Suzuki RM 125

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Fuel leaking from air box after shutting down


Hi
Thats the float valve seals not shutting off, did you clean them & set the float heights?
The overflows from the carb bottoms must also be blocked for the fuel to fill up the carbs which then leaks into the air filter
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May 20, 2010 | 1985 kawasaki ZL 900 A1 Eliminator

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Kawasaki gpz 1000 rx 1987 model


Running well at high revs would indicate that all the fuel and air it needs are getting to the engine and you also have a good spark. Probably no problem with air and fuel filter ( if fitted) or sparkplugs.

Running hot, and bad idling are signs of a lean air fuel mixture. The engine is probably not getting enough fuel at low revs.

This could be caused by an air leak between the carburettors and the engine. Check that the vacuum line to the fuel tap is properly secured at both ends. It is behind the fuel line at the tap.

Get a a short length of hollow plastic tube and use it like a stethascope - put one end to your ear and move the other end around your carburettor mounts with your engine revs as low as you can get, and listen for any sucking noises that would indicate a leak. Look for cracks in the rubber inlets.

The other possibility is that there is an internal blockage in the idling jets or idling fuel circuit. This is where dirt tends to lodge because the jet dimensions and passageways are very fine - The high speed jets are much bigger and dirt often just passes straight through.

Try a little bit of choke while the engine is warm to see if you get a stronger low speed response. If so that would point to an internal blockage.

Jan 24, 2009 | 1987 kawasaki GPz 1000 RX

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