SOHC.co.uk Forums > CB350/400
High revving idle
billdn:
Finally got timing sorted on rebuilt engine and couldn't resist little shakedown ride, you know how it is ! Gearbox smooth, clutch needs adjustment but easy to do.
However despite setting idle screw at 1200rpm , albeit bit lumpy, went well. Until I had to stop at junction revs hit 3000rpm with throttle closed and undone idle screw so wasn't touching , confusing 😐!
Otherwise rode lovely but obviously needs sorting, even rolling off throttle didn't lower revs then slowly eased off.
I'm guessing balance carbs? They have been stripped , cleaned new o rings, courtesy of Nurse Julie, and replaced brass rod for carb floats. Float heights reset to 21mm too. Am I right about balancing please don't tell me got to take damn things off again 😒
Oddjob:
You may not have enough slack in the pull cable Bill. Have you tried loosening that off as well.
K2-K6:
You probably need to reset the carbs with Bryan's method to get a parity of components before refitting. :-\
In situ, lower all the slides an equal amount and then it should start to sit with the main idle speed adjustment more realistically located to give competent adjustment. Rough and ready but should move you in the right direction.
The cause is usually that the sllides have been set during assembly too high, such that with the lifter mech bottomed out the slides still don't close off the venturi.
Don't worry, it's very often done and reasonably easy to work your way out of it.
Nurse Julie:
Well done for getting her back on the road Bill. It does sound like a bench sync is needed.
TrickyMicky:
I agree with Oddjob, before diving in deep with all the strip down malarky, look at the simp-le stuff first. The push pull cables do take a couple of minutes to set up, plus check that they are routed correctly especially round the headstock and right fork, and check engine reaction when turning the bars from lock to lock.
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