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Posted by Albrecht via MotorcycleKB.com on July 10, 2007, 9:38 pm
paul c wrote:
>I would say that at 2 1/4 turns on the pilot screw, it "hangs up" but
>does not "surge". It is interesting to me that manual advises to turn
>out (ie., if I understand the manual correctly) when adjusting, whereas
>what you are saying seems to gibe with what I am guessing).
The method of adjusting idle mixture on CV carbs has always been the same as
adjusting mixture on a car carburetor. Turning the idle mixture screw
clockwise leans the mixture and the engine's response to a leaner mixture
occurs quicket than its response to richening the mixture.
But many old time motorcycle mechanics and dirt bike enthusiasts are still
hung up on the notion that the idle mixture screw is an AIR adjusting screw
like on the old slide valve carbs.
They think that they have to start with the idle mixture screw set out 1 to 1.
25 turns out and that is generally plenty rich for a slide valve carb. Then
they would turn the idle mixture screw counterclockwise and lean up the
mixture until the idle becomes unstable on a SLIDE VALVE carb.
If you get a technical writer that doesn't know the difference between
carburetor types, gawd only knows what the manual will tell you to do.
--
Message posted via MotorcycleKB.com
http://www.motorcyclekb.com/Uwe/Forums.aspx/tech/200707/1
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