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.
Check above the carb for a gas leak from the gas hoses and check the gas tank. They may be running down onto the carb and just appears like the carbs leaking

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Sounds like the floats are stuck or not holding air.
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Could also have dirt in the valve.
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Carb. engines on bikes are usually gravity fed. Just follow the fuel line from the tank to see where it ids distributed to your carbs.
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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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2004 2005 Yamaha YZF R1 Service Manual R1 Moto Data Project
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Most likely, one or more of your carb floats has gotten stuck. The carbs have connected, so one sticky float will impact all the carbs equally. With the bike on the center stand, you can turn on the fuel petcock and see which bowl starts overflowing first, but that's not a perfect test.

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1 Answer

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