SOHC.co.uk Forums > CB500/550

engine revs

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DomP:
This can be very frustrating, I've still not solved my hanging idle but as Ted says go through all of the simple things before you do anything drastic.

Sesman:
Hi, Morala.

For clarity, does this situation persist after the bike has warmed up? In other words, do the high revs persist when the engine is warm and you blip the throttle? I ask as your original explanation seems to suggest that the high engine revs are a temporary situation that self resolves after a short while?

The guys discussing a ‘hanging idle’ are describing a situation where the engine fails to return to a normal idle speed after blipping the throttle. If this is the condition you are experiencing and nothing else has been changed (eg new throttle cables) and the throttle slides snap closed, I suspect that the idle jets are obstructed.

Laverda Dave:
As the bike is reving very high at initial start up my first suspect would be the fast idle adjustment on the carb rail. It sounds as though it has been set very high negating the need for the choke to be used. If this does prove to be the case there will be a reason why the fast idle has been set so high, this could be blocked pilot jet circuits in the carbs (stale fuel gone off in the drillings etc) or poorly adjusted cables.
start with easy to see and adjust items first before tearing the carbs apart although it does sound as though the carbs wil need a good clean and inspection once you have found the initial problem. If you do strip them try and use the original brasswear where you can. Nurse Julie on here sells the fuel resistant viton O-Ring kits you will need.

Bryanj:
500 and early 750 dont have a fast idle, only the K3

Laverda Dave:
That's interesting Bryan. Is this the model where one carb slide is set and the others are adjusted to match? How is fast idle set on these models?

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