Carburetor Fuel Flooding...What's the problem? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 05-31-2008, 04:06 AM Thread Starter
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Exclamation Carburetor Fuel Flooding...What's the problem?

The Problem : front cylinder sound like no power and when I open throttle come white smog, I close the throtlle but the RPM's are still high. I take out air duct (front carburator) and a lot fuel is coming out front the 3 holes and needle (needle is not moving up/dow) look picture
I like my bike but I don't have idea how fix or what I need replace to resolve this problem...please help me.
I already used sea foam, I replaced AIR CUT VALVE DIAPHRAGM in both cabs.
Rear cylinder sound nice and the carb is not flooting.
watch the video here....http://www.youtube.com/watch?v=oWQeHYdSGmQ
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1989 Vulcan 750
Bobber style.
33000 miles,

Last edited by aminjuez; 05-31-2008 at 04:20 AM.
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post #2 of 9 (permalink) Old 05-31-2008, 04:15 AM
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Since you tried Seafoam, it sounds like you're going to have to open it up and clean it. Lots of us have had the same flooding issue's, (including myself), opened the carbs and found some piece of debris hanging right on or around the float needle/seats.
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post #3 of 9 (permalink) Old 05-31-2008, 04:23 AM
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BTW, here's some more info/tips from the Verses on the subject. Click this link- https://www.vn750.com/forum/showthread.php?t=1080
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post #4 of 9 (permalink) Old 05-31-2008, 01:25 PM Thread Starter
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Ok 750Doug, but always is the front carburetor..... if its some piece of debris hanging right on or around the float needle why that never affects rear cylinder?

1989 Vulcan 750
Bobber style.
33000 miles,
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post #5 of 9 (permalink) Old 05-31-2008, 01:57 PM
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You have 2 seperate carbs. One for the front cylinder and one for the rear. If something obstructs one it wont obstruct the 2nd.

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post #6 of 9 (permalink) Old 06-03-2008, 03:51 AM Thread Starter
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Ok. guys I did Gumout trick, no more Fuel Flooding but I have a doubt...the Vacuum piston has to be moving up and down in idle? because both in the front and rear carbs are not moving, only when the throttle is open.
Is normal?

1989 Vulcan 750
Bobber style.
33000 miles,
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post #7 of 9 (permalink) Old 06-03-2008, 02:57 PM
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Is normal. These are not typical carbs, they are Constant Velocity carbs which means they try and keep the air flow into the intake at a constant velocity. The carb pistons as you call them will constantly adjust to keep that airflow the same. It's more difficult at idle since the vacuum pulses from the cylinders are further apart time wise than when the bike is at higher RPM.

Jim W
93 VN 750 "Ursula"
Moved R/R 08Sep06
R/R rewire 17Feb07
New R/R, Installed 14Jun08
New Stator installed 10 Jun08
Maintenance Free Battery 12Jan08
21480 Miles
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post #8 of 9 (permalink) Old 06-03-2008, 10:51 PM Thread Starter
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I think that I have found the problem. Today I sprayed carb cleaner arround carb boots to check vacuum leak and the rpm's go high.
Any idea about that?

1989 Vulcan 750
Bobber style.
33000 miles,
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post #9 of 9 (permalink) Old 06-04-2008, 05:41 AM
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That means there's a leak in that spot where you sprayed.
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