SOHC.co.uk Forums > CB350/400
Carbs off bike - Total disassembly or not?
Mikep328:
What is the general feeling about the level of disassembly that is typically needed for one of these carb sets? Should they be separated for cleaning? TBH, I'm not really seeing a need to do so since most parts are accessible for removal/cleaning/adjusting but I have no experience with working on these 4-carb sets. All four function properly - all airscrews affect the idle as they should and there are no leaks or any issues though I can already see that they need synchronization and the choke butterflies need to be better aligned.
Of course it is easier not to separate the carbs but I don't want to miss some obvious/well-known issue that separating the carbs takes care of.
Bryanj:
Only need to split them if fuel tees leak or im you need to ultrasonic the bodies
Moorey:
If you have them off it's worth splitting them just to change the seals to Viton.
K2-K6:
"All four function properly - all airscrews affect the idle as they should and there are no leaks or any issues though I can already see that they need synchronization"
It's this part that is so important on these to smooth stable idle and leading mixture up onto main jet needle taper. All the small holes have to scrupulously clean, and then some ! to get the fine atomiisation that gives even, cylinder by cylinder burn characteristic to keep parity in them and make them sound smooth.
Synchronisation of the main slides ultimately is for upper mixture air parity, with side effects of smooth running at lowered rpm. But real fine tuning AFTER that's done is the fine idle mixture adjustment with idle airscrews to micro trim that part of carb metering. That is the icing on the smoothness cake, if all the other influences have been set according to correct routine.
Mikep328:
Thanks! I haven't started any work yet - waiting on carb cleaner to arrive - but one thing I see that I don't like is silicone sqeeze-out at the bowl/body joint. So I expect the bowls will be a bit of a pain to remove since they will essentially be glued to the body. Oh well, at least all screw heads are in very good shape so that's a decent sign that whoever worked on them wasn't too heavy-handed!
In examining the carbs I'm seeing what appears to be a piece of very thin black tubing between each pair of carbs. It doesn't seem to match the pics in the service manual which look like brass fittings with O-rings... ??? If it's tubing, what size?
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