SOHC.co.uk Forums > CB500/550

Black smoke and hanging idle after a full rebuild

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thomaspigeon:
Thanks for your reply guys.

I doubt any problem is coming from the engine as I rebuilt it and done all the test to make sure everything was working ok.

Now changing for #35 as a pilot could be a good idea. But I’m running pods which si seems very small, though those jets are #38 and might have worn out. That can be considered.

Also lambda sensors are definitely something I might start to consider too

Thanks
Tom

fogrider:
My bike lent itself to fitting a Lambda sender as it is the 4into1 style exhaust with an aftermarket silencer - that fixes to the end of the 4into1 with an adaptor sleeve. I simply brazed  the sender boss into that sleeve.
I already had the Lambda system too, which helps, so I did'nt have to pay for a couple of dyno runs.
It's not a cheap or easy route to take, but if all else fails, it's a valuable extra tool to use, especially if you have other vehicles and can make more use of it in the future. I've used it on 4 different vehicles now, with good effect.
I'm not sure I'd have bought it just to sort the CB550.
Personal choice .

thomaspigeon:
I've ordered a repair kit for the CB350F carburettors. I rode it today and their is still a bit of smoke when hot so I guess I have to reduce some jet size somewhere!

It will arrive next week. Hopefully that will do the job. I'll keep you updated

Trigger:
Black smoke is nearly always the piston to bore clearance, worn oil rings, valve guilds or seals  ;)

fogrider:
So when a float punctures, or an air filter is clogged, the choke sticks on, dirt on a float needle , a main jet falls out etc etc, that gives blue smoke ?
Or maybe I'm colour blind !

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