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    #1

    carburetor back fire

    I've got a GS450. The number two cylinder occasionally back fires back through the carburetor. I also noticed upon first starting the bike the exhuast heats up faster on the right side. Is this just a matter of synching the carbs? Checking the output of the coils? Checking the valves? All of the above?

    Thanks
    Mike
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    #2
    Carb sync is a good bet. Also, I can't remember how it works but the valves on these tighten up with wear, so they open earlier as the bike ages. You will see what I mean the first time you adjust the valves. Sounds like your thinking is right, that lit up air/fuel shouldn't be getting back through the carb.

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      #3
      Thanks Midnightrider. I just needed someone to back me up on my thinking. I would rather do a carb synch than tearing into the engine or carburetors.

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        #4
        One particular thing with the # 2 carb. The vacuum for the petcock comes from there. Also I would check the fuel level in the float bowls by replacing the drain with a fitting, and putting a transparent tube on it. Wrong float level can really mess up a cylinder.

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          #5
          yeah make sure your carbs are clean and synced. my bike did it for a while then i raised the needle a half step because the bike was running a tad rich in the mid, now it very rarely back fires through the carbs.

          -ryan
          78 GS1000 Yosh replica racer project
          82 Kat 1000 Project
          05 CRF450x
          10 990 ADV-R The big dirt bike

          P.S I don't check PM to often, email me if you need me.

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            #6
            sounds like you should check and set your float bowl levals and sync the carbs to each other also you should check your valve clearances and ur coil/timing

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              #7
              Before a carb synch, you should always be sure the valve clearances and ignition timing are correct.
              And on the seventh day,after resting from all that he had done,God went for a ride on his GS!
              Upon seeing that it was good, he went out again on his ZX14! But just a little bit faster!

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                #8
                Re: carburetor back fire

                Originally posted by Termic
                I've got a GS450. The number two cylinder occasionally back fires back through the carburetor. I also noticed upon first starting the bike the exhuast heats up faster on the right side. Is this just a matter of synching the carbs? Checking the output of the coils? Checking the valves? All of the above?

                Thanks
                Mike
                Sounds like a lean condition or you got erratic timing.
                1166cc 1/8 ET 6.09@111.88
                1166cc on NOS, 1/8 ET 5.70@122.85
                1395cc 1/8 ET 6.0051@114.39
                1395cc on NOS, 1/8 ET 5.71@113.98 "With a broken wrist pin too"
                01 Sporty 1/8 ET 7.70@92.28, 1/4 ET 12.03@111.82

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