Question about 1981 Suzuki GS 750 L

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Carbs I am having the problem with my carbs not shutting off the fuel when not in use.  Meaning when not running the carbs leak gas everywhere.  Plus my #1 cylinder is not working right because of that.  Second is the fuel is getting to my oil now.  Any help?

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Your float needle is not sealing, either because they are bad or because your flat height is set wrong. If the carbs were fine before and just started leaking then I would replace the float needles considering the age of the bike. You can try to clean them up, but the amount of time and energy spent doesn't on that wouldn't be cost effective ( in the time area ) Yes the fuel is getting in your oil if it's overflowing. Anpther thing you have to worry about is hydrolocking the motor. when gas fills up the cylinders and you try to start it you can bend a rod because fuel ( or water type substances ) doesn't compress. If you try to start it but it stops cranking suddenly. stop trying to start it and pull the plugs. BE VERY CAREFUL... when yo spin the motor over with no plugs it will spit fuel ( Only if Hyrolocked ) you want to cover the holes with some rags but make sure the spark plug wires are out of the way. You don't want to catch yourself, the bike or anything surrounding you on fire. Hope this helps

Posted on Jun 27, 2009


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New carbs aren't known for leaking unless you had it open and altered some thing. A float can get stuck if you let it sit without using it. Should put stable in your tank and run it so thestable gets into the carbs.
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Sounds like the floats are stuck or not holding air.
The float works much like a toilet float. It has air inside and floats on top of the gas, shutting off the valve when the gas level is high enough.
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Have you checked your fuel filter?
Have you checked to see if fuel is getting into the carbs?

Also is your machine parked outside and is it below freezing? It happens to me often when my machine sits for a while. Water in the fuel freezes at the carbs or in the filter and won't allow fuel to get through. I put a little ceramic heater under the cowling and cover it with a couple old blankets. It usually does the trick in a couple hours. Then I run some fuel cleaner though it. g'luck

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Hi, Anonymous and the usual suspects are:
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For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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The right way to correct this is to dismount the carbs and clean out the bowls and floats to ensure that everything is working properly. This would also fix the issue of having some dirt in the needle valve, preventing it from fully shutting off.

The sloppier fix that might or might not work for you is to leave the carbs in place and drop the bowls for the outer two carbs. When a bike is routinely parked on its side stand, I've found that the right hand carb, which has the lowest gas level and hence is a bit more likely to gum up. A dose of industrial strength carb cleaner (I like the stuff labeled "gum cutter") may free everything up--though you have to be careful that you don't damage or dissolve plastic/styrofoam floats.

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Hello and thanks for the question.
It sounds like the carbs are not getting fuel to the engine. This is common with the fuel that we get now. the fuel is not stable and can gum up quickly. I have seen carbs become clogged in as little as 60 days.

The first thing to do is drain the old fuel out of the tank and the carbs. There is a drain screw at the bottom of the carbs and you can drain the fuel out by loosening the screw. Make sure that you are carefull when draining the fuel out so that you dont have excess fuel leaking everywhere. I usually put a small container uinder the drains.

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1 Answer

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