SOHC.co.uk Forums > CB350/400

IDLE PROBLEMS CB400/4

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Nurse Julie:
Hi Chaps
Having problems with Hettie, the 400/4.
When first started from cold she idles fine at about 1100 rpm but when hot the idle increases intermittently to about 2000 rpm and then gradually settles back to 1100 rpm.  Have had the carbs off today as I thought it may be  dirty idle jets. Dismantled the carbs, blew everything out with airline, no blockages. Floats are where I set them last year, 21mm, re bench synced. Mixture screws at 2 turns. Couldn't find evidence of any air leaks on any rubber bits, refitted carbs.... still the same problem. Checked the timing / points all seem ok.
Where should I look next?
Ta in advance
Julie x

hairygit:
I'm sure Trig will give the rubber parts a thorough inspection for you! Has the bike been laid up long? I more than a couple of months, always worth checking the advance weight pivot points on the timing unit, often overlooked and neglected of any sort of lubrication. The springs are not very strong when it comes to returning to static timing (idle speed), and sticky or rusty/dry pivot points can cause those symptoms.

Nurse Julie:
I have been riding her recently Hairy but to be honest she did do it sometimes last year as well. I will look at the bits you suggest and report back.

Norniron:
My 400 does the same Julie!
Im always fumbling at the idle wheel on the carbs at the lights

Nurse Julie:
Haha, what, and burning your hand like I do when I have a fumble  :o You have electronic ignition though Dave and pods fitted, so yours should run perfectly.

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