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Judge my CB550F2 1977 idling

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alexdecker:
Hey all

This is my CB550F2 from 1977 idling. Does this sound okay to you?

https://www.youtube.com/shorts/xxPyy_B_-Uw

- Alex

Johnwebley:
Sounds ok,

Possible one cylinder out of sync

Have you checked tappets

Used a carb vacuum gauge system to do the balance

But it seems smooth and reliable



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McCabe-Thiele (Ted):
As you have asked the question I suspect the engine clatter is louder than it was at idle?

I'm no expert btw, It sounds to me as though there is a miss match at lower revs between the pairs of cylinders.
I would be checking the timings for 1/4 & 2/3 if you still  have points, plus the valve clearances, then carb balance.

There are members here whose views will be backed up by decades of experience that should help.

Skoti:
As John has already suggested the carbs are most probably out of synch.

Once corrected you will have smooth and nice idle.


I use Morgan Carbtune.

https://www.carbtune.com/

K2-K6:
As already noted, needs some adjustment to better optimise running.

I agree with Ted's impression, that it sounds like a pair of twin cylinders slightly out of harmony, and his advice to make sure the ignition is accurately set for both points.

Notice it sounds a little a horse cantering with that four beat rising and falling.

Carburettor synchronisation a suspect, but if ignition is out there's no point in trying to synchronize the carburettors first.

Verify the ignition setup is accurate, then look at carbs.

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