Question about 1981 Suzuki GS 750 L

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81 Suzuki gs650 #2 carb floods gas out after start

I have an 81 Suzuki gs650. I can get the bike running then it starts flooding gas out of the #2 carb. I can keep bike running, kind of, by working throttle but it just continues to leak gas out and runs super rich with white smoke out the tailpipes. If I let off throttle more gas comes out and it quickly dies. Please help. I have taken tank off and fuel valve out and cleaned screen and make no diffrence. Thank you.

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The float is stuck open in the leaking carb. Remove the float bowl and clean the carb after removing the pin holding the float in place. While the float is out, shake it to see if gas has gotten inside it. If so, you will need a new float or will need to drain the float then re-solder it to seal it up again. To drain the float chances are you will need to drill a vent hole in it to allow the gas to drain. Just solder the vent closed when done.

Posted on Jul 14, 2010

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Hi,my name is Darrell and I have a 81 gs 750 l.when i got the bike #2 cyl was flooding out big time.found that the #2 carb had a vac line to the peecock and was pulling gas through it so we blocked it...


you will need to fix the fuel tap and try again.
The vac line opperates the vacumn tap, so the fuel shouldnt flow unless there is vacumn. either you are running it on prime or the tap is jammed open and can cause flooding in all the carbs.
You may also need a new air cleaner element

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have you a spark?sounds like ouyr float level is too high and the carbs are flooding,try to decrease the float level,she will not start with too much gas

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1979 suski 750,bike runs on 2 left side cylinders, 2 right side cylinders are not firing, new plugs, plugs seem to be firing, rebuilt carbs adjusted, raw gas com coming from exhaust pipes on right side....


Hi and welcome to FixYa,

With the indulgence of craigjamesbt...

A few additional ideas to consider:
  • it would be an electrical/ignition issue if 1 & 4 or 2 & 3 will not fire but not 3 & 4;
  • almost always, raw fuel on exhaust indicates a flooded engine. A flooded engine would most likely be a carb issue;
  • best way to determine if it is an engine concern is to do a compression test;
  • a way to test the right carb pair is to deliberately starve them of fuel by temporarily plugging/blocking the inlet port/seat with rubber similar in appearance as to those used for glue gun, not installing the needle and float. Assemble the carb and install. Start the bike and use/spray carb cleaner on the right side carb. Note if 3 & 4 will fire even intermittently.
Would appreciate a postback on results/updates on any developments.

Good luck and thank you for using FixYa.

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This is what the shop manual says.
basically what that means turn the float bowl upside down and keep the bottom of the float even with the edge of the bowl.

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Are the cabies flooding or runing out of fuel? pull the choke on dose it help if it does low fuel.

Drain the bowls and see if there is plenty of fuel.....If its flooding turn the fuel off or block it when the engine starts to drop clys if it starts to pick up after 10secs or so the carbies are flooding

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