SOHC.co.uk Forums > CB500/550

Black smoke and hanging idle after a full rebuild

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fogrider:
Re the main jet O rings, I also installed new main jets that came fitted with new O rings. I was'nt  totally satisfied they were sealing fully , when removed and measured, they were 1x4 ( nominal) and , since O rings are sometimes subject to shrinkage in  manufacture, they were actually 0.9mm x4, which is a tenuous fit.
I figured 80p for 4 'O' rings was worth the effort.

McCabe-Thiele (Ted):
Interesting comment about strong engine braking. Not sure if you have had a rebore or how many miles you have covered since the build but I personally would not be altering too much until the engine has at least partially run in.

K2-K6:

--- Quote from: Macabethiele (Ted) on June 15, 2021, 06:42:40 PM ---Interesting comment about strong engine braking. Not sure if you have had a rebore or how many miles you have covered since the build but I personally would not be altering too much until the engine has at least partially run in.

--- End quote ---

Shutting the throttle with it running that rich will give alot of engine braking as it's probably close to stalling like that.

thomaspigeon:
@bryanj here are the electronic ignition that I’m running (not a Dyna S) https://www.davidsilverspares.co.uk/CB550K3/part_192275/
I still have the points somewhere so I might give it a go.

I probably have some O rings kicking around so I can change those

I can’t try anything until this week end but yes definitely a hanging idle and black smoke is a mixed message. Now I’ve read somewhere that you can solve this by dropping the needles so can be worth the try.

Also I know it’s a complication but I can’t put the air box back as the previous owner discarded the air box

thomaspigeon:
I mean he removed the brackets on the frame

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