Metering needle movement

husabutt · Jan 30, 2006

I noticed that on a few carbs the metering needle has some up and down play in it. You would think this would have an adverse effect on fuel delievery but it seems to be of no consequence. I suppose my question is can a better or more precise fuel mixture be obtained with a different way of securing the needle to the slide. The current method does not seem precise and the movement may be as much as a clip notch or two I think.

LINEAWEAVER · Jan 30, 2006

husabutt said:
I noticed that on a few carbs the metering needle has some up and down play in it. You would think this would have an adverse effect on fuel delievery but it seems to be of no consequence. I suppose my question is can a better or more precise fuel mixture be obtained with a different way of securing the needle to the slide. The current method does not seem precise and the movement may be as much as a clip notch or two I think.

Such indeed makes a difference. Note late model Keihin FCR carburetors pre-load said metering rod with a spring in order to insure proper placement.

Dale

Taffy · Jan 30, 2006

and dell ortos! they are forced to rub against the front face of the atomiser. certainly on my old dells they did. if the spring sits directly on a huge clip then that's the truth of it.

regards

Taffy

JoeUSA · Jan 30, 2006

There is another point with the Dellorto, the rubbing of the needle on the needle jet causes them both to wear, thus causing a change in mixture that will cause the owner of a Desert/Woods Enduro to have to replace both items every 2000 - 3000 miles or so.

Joe

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Metering needle movement

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