SOHC.co.uk Forums > CB500/550

550f running rich?

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DomP:
That's brilliant John! I've got all of the above too.

taysidedragon:
Ignition advancer sticking?

DomP:
The springs have been trimmed byba preious owner, if anything one is too taught.  The advancer itself has benn taken apart and greased so should be no free movement problems.

taysidedragon:

--- Quote from: DomP on October 10, 2025, 11:46:12 PM ---The springs have been trimmed byba preious owner, if anything one is too taught.  The advancer itself has benn taken apart and greased so should be no free movement problems.

--- End quote ---

If you can't find any other cause of the problem it would be worth trying the advance unit with standard springs.

mickwinf:
Where are your mixture screws se? I had similar symptoms on my 500 and the screws have ended up at 2 full turns out.now runs well, May be the modern fuel.

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