SOHC.co.uk Forums > CB350/400

Slight hanging idle when hot.

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Dolomite_:
I went for the 2nd break in run yesterday and it was mostly fine, just a clutch adjustment at first but after it was hot when stopped at traffic lights in 1st, and with the clutch in the idle seemed to hang at 2k - 2.5k rpm but when closed that the throttle that extra bit from its natural resting position it then started to fall back to what it should be idling at.

Is there anything I need to check/adjust? Does the throttle linkage at the carbs need to be adjusted so it closes more? It appears to be fully closed because the extra bit I close the throttle just fully slackens the throttle cable.

K2-K6:
Firstly, try putting more slack into throttle pull cable if there's adjustment available.

The throttle slides should never be "hanging" on that cable, clear slack should be there.  The slides should only sit on their mechanical operating mechanism and be completely independent of the cable when you release the grip.

There's diagram in manual for setting that twistgrip movement to reference.  Also try turning steering from lock to lock while idling, it should not affect rpm at all.

McCabe-Thiele (Ted):
As K2-K6 (Nigel ?) has said when the throttle is closed it should go back fully to the idle stop screw on the main bracket.
It is important that both cables are correctly adjusted as per the manual.

It also helps if the angles on the outer cables are a nice curve into the front frame area- these are adjustable at the handle bars.

The original route of the throttle cables is on inside of the headlamp bracket - as I have fitted a non-standard headlamp my cables run on the outside of the forks.

cable routes by Macabe Thiele, on Flickr
.

Alexrayz:
Speaking of that, do you have a picture of the horn area? I have removed the wire bracket thingy and cant remember how to put it back i. place


Sent from my iPhone using Tapatalk

Martin6:
If it hangs after you've adjusted the throttle, check for a leak in the carb to head rubber manifolds.

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