Unexpected Engine Noise

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  • kjsamm
    • Feb 2026

    #1

    Unexpected Engine Noise

    I was on my way home from work this evening, bike was running great. I pulled over at the gas station for a quick break. (40 mile ride one way) After I had left and was on the highway again i thought I had left something on my seat forgetting to put it back in my pocket. I pulled over, found it in my pocket and proceeded to get back on highway. Speed limit is 65 mph, so since I had done all sorts of maintenance and she was running great and had her power back I decided to give it to her. She took off like a bat out of hell! It was wonderful! Got to town bike sounded normal. Was taking a left turn in right turn lane of a double turn, car next to me decided half way through to continue his turn in my lane. I saw him coming and got out of the way. Leaving the next light is when i noticed the noises. I didn't jolt or jerk the bike at all. Simply braked without any wheel lock up. There is no performance issues, runs the same but I now have a LOT of engine noise that I NEVER had before. Its coming from the top end. Seems like left side of motor. Its a very loud tapping. Like an industrial sewing machine. Also the exhaust seems louder on left side now but not at the muffler, at the header its self. But not a rumble like there is a hole or a pipe came loose, sounds like you can hear more exhaust "air" leaving leaving the motor. What happened?????!!!!!!
  • kjsamm

    #2
    Before its asked...valves are in spec (done last month, one was tight. EX #2), carbs are cleaned and vacuum synced, new intake boots and o-rings and exhaust port gaskets
    Last edited by Guest; 08-09-2014, 02:50 AM.

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    • posplayr
      Forum LongTimer
      GSResource Superstar
      Past Site Supporter
      • Dec 2007
      • 23673
      • Tucson Az

      #3
      Left side is starter clutch, right side clutch basket. Clutch basket is probably a deeper knock .

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      • tom203
        Forum Guru
        Past Site Supporter
        • Aug 2010
        • 8925
        • Norway,Maine

        #4
        ".....like an industrial sewing machine"
        I'd start by removing cam cover- tapping suggests bucket/shim problem.
        your exhaust might have loosened up under hard braking.
        1981 gs650L

        "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

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        • Crankthat

          #5
          Originally posted by tom203
          ".....like an industrial sewing machine"
          I'd start by removing cam cover- tapping suggests bucket/shim problem.
          your exhaust might have loosened up under hard braking.
          It would be a good easy start as to where to look.
          Check entire exhaust though and not just at headers.
          I am pretty sure that is what Tom is implying.
          It could come apart at bottom and effect more noticed at headers.
          Give the whole thing a good tug in various areas.

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          • kjsamm

            #6
            Thanks for the replies, I work 6 days a week so for now she sits until I can find some time to tear back into her. EX #2 was TIGHT +4, could I have finally worked off all that carbon build up on the valve, and the sound I'm hearing is the valve just seating(louder than the others for some reason)?

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