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Black exhaust tip and gas smell

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    #1

    Black exhaust tip and gas smell

    Hi guys

    looking for some ideas here.

    I've been working on my bike and it finally runs nice. The only problem I have is that the back of the exhaust gets pretty black rather quickly. Also I can smell gas when deaccelerating to a full stop. There's no smell in the garage in the morning.

    Fuel consumption is about 35-40 mpg.

    I cleaned the carbs and replaced all orings and did a bench sync (no proper sync yet). I also adjusted the valves to within spec.

    Any ideas as to where I begin looking for the cause of the black exhaust and fuel smell?
    Tags: None
    #2
    Sounds like it's running rich. First check to make sure air box is not restricted and that the air filter is properly oiled (not overly oiled). If everything looks good, then I would suggest pulling carbs and check to make sure float height is within spec. How many turns out did you set the mixture screws after your carb rebuild? 2.5 turns is a good start, then tune to highest idle. Good luck.

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      #3
      The filter is brand new and came preoiled, so that should be alright. I'll check it though.

      The mixture was set to 2.5 out and i did try to adjust to highest idle from that, but I wasn't really able to tell much difference when turning them. I think I suspected a bigger change in the idle.

      I'll pull the carbs and check the float-height (again).

      What about the main jet? Maybe the previous owner changed it to a bigger one? Would that cause the symptoms I'm describing?

      Originally posted by JTsGS650 View Post
      Sounds like it's running rich. First check to make sure air box is not restricted and that the air filter is properly oiled (not overly oiled). If everything looks good, then I would suggest pulling carbs and check to make sure float height is within spec. How many turns out did you set the mixture screws after your carb rebuild? 2.5 turns is a good start, then tune to highest idle. Good luck.

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        #4
        Won't be the mains unless you're running around with the right grip twisted wide open, all the time. I would still suspect the air filter being over oiled and or a PO may ay installed larger pilots and or shimmed the needles?

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          #5
          No fuel leaks anywhere?

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            #6
            Here is a link to the service manual hosted on Basscliffs site.

            Page Not Found
            http://www.mtsac.edu/~cliff/storage/gs/GS650GManual.pdf


            When you pull the carbs you can check the jets with what is supposed to be stock. I would suspect float height.

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