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Good CV Carb explanation (Read 51 times)
Dave
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Good CV Carb explanation
08/14/12 at 09:58:23
Here is a good explanation on the operation and jetting of the CV carb. It was written for scooters - but does apply to our bikes. Our carb has the "idle fuel jet" - so turning the screw out makes the mixture richer. (The idle air jet description does not apply to our bikes).
http://www.battlescooter.com/1.html
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Charon
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Re: Good CV Carb explanation
Reply #1 -
08/14/12 at 11:26:39
I think there is an error in the fourth paragraph. CV slide position is NOT controlled by engine vacuum. If it were, the slide would be fully open when the butterfly is closed and engine vacuum is highest. CV stands for Constant Velocity, and the slide position is controlled by vacuum created by the velocity of the air passing through the venturi.
One very good point was that the position of the throttle slide is not directly related to the position of the throttle butterfly. It can, and does, change even though the driver holds the throttle control in a constant spot.
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Dave
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Re: Good CV Carb explanation
Reply #2 -
08/14/12 at 11:38:59
Charon wrote
on 08/14/12 at 11:26:39:
I think there is an error in the fourth paragraph. CV slide position is NOT controlled by engine vacuum. If it were, the slide would be fully open when the butterfly is closed and engine vacuum is highest. CV stands for Constant Velocity, and the slide position is controlled by vacuum created by the velocity of the air passing through the venturi.
One very good point was that the position of the throttle slide is not directly related to the position of the throttle butterfly. It can, and does, change even though the driver holds the throttle control in a constant spot.
I agree......the slide positon is controlled by the engine vacuum in the venturi area.......not the vacuum on the engine side of the throttle plate. The vacuum is created by the engine - but this may be a bit confusing as it is written. There is a link at the bottom where you can comment.....I will read it again when I have time and see if it merits sending a comment.
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