Help my bike is not running as it used to.

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  • doug g
    • Feb 2026
    #1

    Help my bike is not running as it used to.

    Well my 750E which has been running great suddenly decided to start stumbling at all rpms. I took it to a track day this weekend and really ran it good. Everything was fine and then all of a suddent she started to stumble. It felt loke it was running fat. I got it home and pulled the plugs and all looked good. A little fat on the bottom end but it has always been that way. I put new plugs in it and it was the same. Next I raised the idle to about 3000rpm and pulled one at a time each spark plug lead to see if I could pin point the problem down to one cylinder. Each time I pulled a lead the bike ran worse which leads me to believe it is not an ignition problem. The only things I can think is carburation or timing. I am going to pull the carbs and see what is up but like I said the plugs look fine. I have no air leaks and the filter is brand new. is there a chance it might have jumped a tooth on the cam chain? The motor fires right up and sounds healthy. No funny noises other that the stumble. I need to get it fixed by this weekend as I have a ride planned with some buddies. any advice would be welcome
    Tags: None
    • Guest
      #2
      Petcock.............

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        • Steve
          GS Whisperer
          • Jun 2005
          • 35925
          • southwest oHIo
          #3
          Did it sart running fat during a run or on the way home?
          Kinda sounds like the rubber plugs covering the jets in the float bowl might have slipped out of place.


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            • doug g
              #4
              during a run on the track.

              I switched the petcock to prime and the same issue was still present.

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                • oldschoolorange
                  #5
                  I would be all over the carbs, something has probably plugged one of the passages, that or your Ignitor is not firing the coils properly

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                    • doug g
                      #6
                      well I solved the problem. I believe the carb vent line was clogged and this was causing the problem. I pulled the carbs and all was well with them. I reinstalled everything and all is fine now. Thank god!!!

                        Comment

                        • Guest
                          #7
                          Originally posted by doug g
                          well I solved the problem. I believe the carb vent line was clogged and this was causing the problem. I pulled the carbs and all was well with them. I reinstalled everything and all is fine now. Thank god!!!
                          WooHoo!!!!!!!!!!

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