Carb Removal or else - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
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post #1 of 18 (permalink) Old 08-16-2006, 10:21 PM Thread Starter
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Carb Removal or else

Ive been having trouble lately.While idling,the rpms will jump from about 1100rpm to about 1250rpms for about 3 seconds,then go back to 1100rpms.It sounds like one of the cylinders is not firing or getting gas.When I lean the bike to the right,while idling,the rpms go up.I can ride for about 13 miles ok,then all of a sudden,while in low gears,it starts wanting to die.I have to rev it up,to get home quick.It sounds like,blub,blub,blub,blub.I drained the carbs.The left side drained about a cup of gas.The right side drained about a 1/4 of a cup of gas.I could hear gas boiling or something on the left side.The gas tank vent was hissing.When I opened the gas cap,it made a noise like psssssssss.Alot of pressure in the tank.Also,I have noticed that the left carb will leak around the shaft that moves the butterfly valve or around the choke plunger.My quess, is that the valve seat on the float is not working.Stuck or whatever,letting gas just flow over.I just want to make sure that this problem is my carbs,#1 and not something else.Any help will be greatly appreciated. Steve
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post #2 of 18 (permalink) Old 08-16-2006, 10:30 PM
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Sounds like you have 2 problems, some carb issue and that your tank vent is blocked. Easy way to check the tank vent is to disconnect the vent hoses (under the seat, 2 small hoses at the base of the tank). Start up the bike, when it starts to sputter and wants to die, disconnect the hoses, if it starts running good again, then you have a blockage in the vent/evap system.

Safety tip: Don't leave these hoses disconnected as raw gas and gas fumes vents out of the tank into them (right above the rear cylinder exhaust manifold).
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post #3 of 18 (permalink) Old 08-16-2006, 10:41 PM
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Some tanks only have 1 hose on the tank. California bikes have 2.

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post #4 of 18 (permalink) Old 08-16-2006, 10:57 PM
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Make sure after you getting everything back together that you check/change your oil. Just in case any of the flooding on that cylinder got past the rings and into the crankcase. But it sounds to me like you're on the right track.

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post #5 of 18 (permalink) Old 08-16-2006, 11:20 PM
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That is almost the same thing that happened to me... right after filling the tank.. blub, blub.. ran bad all the way home. after a trip to the dealer, it turned out to be a plugged vent hose.

All was good after that!! Check the little things first.

If you have an air compressor you can blow through the vent tubes to see if they are plugged.

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post #6 of 18 (permalink) Old 08-16-2006, 11:29 PM Thread Starter
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Me again

Im not sure where the vent hose is.I thought that the tank vented from the cap?
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post #7 of 18 (permalink) Old 08-17-2006, 02:16 AM
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Unless I'm mistaken, it's the hose under the seat at the back of the tank. It's for emissions laws. Goes into an evaporative cannister.

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post #8 of 18 (permalink) Old 08-17-2006, 11:00 AM
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Quote:
Originally Posted by cegodsey
Unless I'm mistaken, it's the hose under the seat at the back of the tank. It's for emissions laws. Goes into an evaporative cannister.
Only goes to a canister on Clifornia bikes. Mine just hangs down in front of the swing arm. If I fill the tank and park in the sun it will drip out gas due to the heat. only 3 or 4 drops but I can see a spot on the ground

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post #9 of 18 (permalink) Old 08-17-2006, 06:14 PM
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Good! that explains the smell of gas I had after I parked it in the garage yesterday.

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post #10 of 18 (permalink) Old 08-17-2006, 07:00 PM Thread Starter
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carb questions

Does this hose connect to the petcock? or are the two lines from petcock just vacume lines to suck gas when engine is running? Does anyone have a picture of this fuel vent line? When I say,that I drained about a cup of gas out of the left carb,does that sound like a stuck float needle?how much gas is usually in the carb? SteveAlso,my bike is an '86 with 21,000 miles.

Last edited by ssmendez; 08-17-2006 at 07:12 PM.
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