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Old 07-20-2009, 06:18 PM   #1
Suzuki GS750L
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Default Need help troubleshooting my suzuki gs750l, fuel/carb problem


I own a 1978 Suzuki GS750L. This is a bike I bought used with 4200 miles on it. I'm having a couple of problems with it. The bike ran great when I brought her home, but after a few days of riding she began acting up.

Problems: I cannot go over 25 MPH no matter what gear I am in. The bike sputters and acts like it's not getting enough fuel. In reality, it is getting too much fuel-the fuel tank will drop by 1.5 to 2 gallons after less than 10 miles of riding. I find this excess fuel in the oil when I change it.

I have had a couple of different recommendations to fix these problems. I've tried using Ringfree in the engine to free the rings if they were frozen, which would cause the continuous flow of fuel. This has not worked so far. I also tried to shock the engine using SeaFoam. I have new spark plugs and a new fuel line which I am going to try next.

I know the carbs were rebuilt two years ago and have heard they might be the problem. Does anyone know of an easy way to check for this? I own a basic tool kit and hope to get it into a shop soon, but it is hard to transport it without it running right.

I would appreciate any advice that I could try as a beginning mechanic and first time bike owner. I'm trying to avoid taking the bike to a repair shop.

Thank you and kind regards.
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Old 07-20-2009, 07:23 PM   #2
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Most likely the floats in the carbs are sticking. take the carbs off and have someone rebuild them correctly and I bet the bike runs like it was brand new.
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Old 07-20-2009, 10:28 PM   #3
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If the engine is filling with fuel then you have at least one stuck float. The carbs need to come off and get cleaned out. This is not a super difficult job. Just get a manual and follow the procedure.
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Old 07-21-2009, 10:45 AM   #4
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While the engine is filled with fuel take the big fat wire marked - off the battery and connect it to the side of the battery that's marked + than walk away briskly....
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