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New accelerator cable, jerky throttle

Posted: Mon Aug 03, 2026 5:49 pm
by Grumpy21
Replaced the accelerator cable today with a new one from ESM. Easy enough. Now the pedal is very jerky and I can’t figure out why

Cable and carb both free and smooth, pedal free and smooth. Problem seems to be at the bulkhead grommet/ferrule/guide. Tried a tiny about of grease with slight improvement.

I’m wondering if the old cable wore some of it away and the new cable is chaffing on the sides. Considering running a very slightly wider drill through and see if that helps.

Re: New accelerator cable, jerky throttle

Posted: Mon Aug 03, 2026 6:03 pm
by Bill_qaz
viewtopic.php?t=79841&hilit=Throttle

Previous post may be of help :tu1:

Re: New accelerator cable, jerky throttle

Posted: Mon Aug 03, 2026 6:34 pm
by Grumpy21
Interesting thanks. I’ll have a measure and fiddle later.

Re: New accelerator cable, jerky throttle

Posted: Mon Aug 03, 2026 10:43 pm
by Grumpy21
Burr on the end of the outer tube, sorted now I think….

Re: New accelerator cable, jerky throttle

Posted: Tue Aug 04, 2026 8:58 am
by svenedin
Although it wasn't the issue in this case, the other thing that can cause a problem is the trunnion attached to the cable guide plate at the carburettor end of the cable. Sometimes there is a Heath Robinson affair if a non-standard carburettor has been fitted or the trunnion can wear so that the cable is held at an awkward angle and it will not run smoothly.


Stephen

Re: New accelerator cable, jerky throttle

Posted: Tue Aug 04, 2026 3:05 pm
by Bill_qaz
Grumpy21 wrote: Mon Aug 03, 2026 10:43 pm Burr on the end of the outer tube, sorted now I think….
Glad it was an easy fix :tu1: