SOHC.co.uk Forums > CB750

Uncontrollable carbs

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the-chauffeur:

Cheers guys.

Bryan - thanks for the pointer on the idle speed.  From what you've said, I think I may have been aiming a little too low.  I'll wait for the new rubbers to arrive and then have another go at setting it up.

 ;D

K2-K6:
As the other posts, the engine to carb rubbers seem to get veeerrrry hard over time and particularly the end that fits to the carbs ends up being very hard to deform with the clip to enable you to get a good seal there.

I've always felt that below about 950 (indicated) revs it's gets very uncertain for real stability and you can chase it forever and never be happy. As Bryan says, 1100 is a good compromise without chasing your tail.

I guess when you get the carbs down to flowing that slow then component tolerance may exceed what you are trying to balance.

Also the points switching at slow speeds gets more "fuzzy" to give you more variance there. Maybe worth trying new condensers if they are sparking (run it in the dark at low rpm to check for sparking at the contacts) as the timing will shuffle about a small amount as a result, unless you've got electronic.

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