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Help my bike is not running as it used to.

  • Thread starter Thread starter doug g
  • Start date Start date
D

doug g

Guest
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
 
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.


.
 
during a run on the track.

I switched the petcock to prime and the same issue was still present.
 
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
 
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!!!
 
doug g said:
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!!!
Click to expand...
WooHoo!!!!!!!!!!
 
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