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Old 03-28-2010, 02:43 PM   #1
pyner101
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Default gs 550 carb problem

Hi, I have a 1981 gs550 which I have been rebuilding. I was given the carbs in bits so stripped them down, cleaned and put them back together. Now at the stage of starting it but having trouble. I have to put my hand over the carbs flooding them to get them to start. It takes a long time to get it going and there is a lot of smoke. These are the old type carbs, they have a screw underneath the carbs by the float bowl it is like the air mix screw. I can't find any reference about this screw and what adjustment it may need and if this is causing the problem. Can any one help me please?
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Old 03-28-2010, 03:39 PM   #2
A Star Ride
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I'm no pro at carbs by any means, but that screw sounds like the drain.
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Old 03-28-2010, 03:56 PM   #3
mscuddy
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It's the pump-jockey sockets, you have to use an oakum-packings on the float-spindles, but that's the easy part.

I don't know where you live, but there must be a motorcycle salvage yard close somewhere, right? Go there, quickly, and purchase a used rack of carbz for your poor Suzuki. Either that, or drive youself nuts trying to get those "carbs made from bits" to work worth a damn.

GO NOW! BEFORE IT'S TOO LATE!
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Old 03-28-2010, 09:34 PM   #4
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Default carbs

i just sold my 81 gs 750 and it had the same carbs. the screws on the bottom are drain screws. there are so many thing that could be wrong if you dont know that much about carbs well good luck.
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Old 03-29-2010, 01:29 AM   #5
pyner101
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hi its not the drain screw, this screw tapers out to a sharp point and goes verticaly up into the card housing, these are slide carbs
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Old 03-29-2010, 05:59 AM   #6
seruzawa
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Tapered screws usually means pilot screws. Try starting at 2 turns out from lightly seated.
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Old 03-29-2010, 06:42 AM   #7
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Seru is right, the fuel mixture screw's gererally start out at 2-21/2 turn out. Do you have the airbox hooked up to the bike that could cause a hard start. What about the bike, how longs it been sitting if at all, mileage, compression?
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Old 03-29-2010, 12:50 PM   #8
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Indeed. Without the airbox, you will be chasing jetting problems forever.
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Old 03-29-2010, 02:45 PM   #9
pyner101
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hi thanks for all your suggestions, i have some k&n filters for the carbs. there are pilot/mixture screws on the side of the carbs which can be adjusted when carbs are on, these pilot/mixture screws are underneath so you have to take the carbs off to adjust. i have never seen this on carbs before so am a bit confused with what they do (been working on bikes for 30 years) i will let you all know if i get it going.
thanks all for your help
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Old 03-29-2010, 02:50 PM   #10
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Isn't the screw in the bottom with the float bowl the main jet? Maybe that's just for moped carbs.
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