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Old Jan 12th, 2020, 12:17   #7
Clifford Pope
Not an expert but ...
 

Last Online: Today 09:16
Join Date: Dec 2001
Location: Boncath
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Quote:
Originally Posted by CosmicBike View Post
Unless the throttle position sensor has an input (it's not clicking off idle, I need to remove it and test outputs are closing)
It's meant to click off when the throttle is closed, and make a click the instant you move the throttle. You set this just by loosening the screw and turning it.

If it's not set correctly, the most likely explanation is that someone has adjusted the throttle stop screw to increase the idling speed. That's wrong - the throttle stop is pre-set, and if that results in too low an idling speed then something else is incorrect.
I can't recall - have you cleaned the throttle body and butterfly with a bottle-brush and carb cleaner? Also as suggested check the convoluted hose for splitting along a corrugation or rubbing on the inner wing.
It's hard to spot a crack - it flexes as the engine rocks. Remove it and hold it up to the light while flexing, or shine a torch down it in the dark.
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