SOHC.co.uk Forums > CB350/400
Won't return to idle/slight oil seep...
K2-K6:
To add detail, the idle circui, both air and fuel, have to be ABSOLUTELY on the money for clean unimpeded flow on these carbs, else you'll chase your tail forever :)
They meter really fine amounts, are very accurate and work impeccably when all clean and set well.
TrickyMicky:
I've owned my 400 for over 30 years, and I've found that because there is virtually no flywheel effect, it does not like 'ticking over' until really warm. I made the mistake of increasing the idle speed using the large thumbwheel under the right side of the tank. This was fine until the engine was hot, and then, like yourself it was "idling" at 2500 revs! If your choke lever is set up right, there is a fast idle position as you start to lift it. You say that it's possible the carbs may have been removed, might be worth checking the operation of the two throttle cables, when I replaced mine it took a couple of days to get them settled in correctly. Hopefully this might help before you have to go tearing everything apart. Good luck. Mike.
PS. I heartily second the comment re. the gearbox oil seal!!
Mikep328:
Good info, thanks! Today I'm going to check the fact idle/choke linkage and throttle cable adjustment. Regarding adjusting the carb airscrews...is there any reason to re-install the four black plastic airscrew limiters that were on the carbs? I don't really see any need for them now.
Nurse Julie:
"Regarding adjusting the carb airscrews...is there any reason to re-install the four black plastic airscrew limiters that were on the carbs? I don't really see any need for them now"
No, they are not needed. Don't throw them away though, keep them safe.
K2-K6:
Black airscrew limiters, I'd view them as obviously limiting movement, but think they look to do tbat specifically in relation to situations that we probably don't encounter in these lowlands :)
For screws set at sea level, then riding up to high altitude, they seem to give a set adjustment to compensate without having to do the "turns counted out" thing. In other words you could easily set them at one end or t'other in that scenario. And maybe an early nod to restriction on adjustment for emissions legislation in some market.
Outside that, they dont seem to do much, but some may want them for originality purposes.
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