Originally shim under needles? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 3 (permalink) Old 10-04-2012, 02:47 PM Thread Starter
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Originally shim under needles?

Are there shim under carb-needles from factory?
What is the purpose of these shims?
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post #2 of 3 (permalink) Old 10-05-2012, 11:11 AM
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As far as I understand it, the factory does not shim them.

A shim will effectively raise the pointed end and open the gap a bit....same effect as a needle with a different taper installed.
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post #3 of 3 (permalink) Old 10-05-2012, 02:44 PM
Crap, I WAS in 5th gear.
 
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http://www.gadgetjq.com/keihin_carb.htm

Shim(s) (or clip position) correct a lean point just under 1/2 throttle. See the chart in the Section II of the linky. A need for needle shims might be indicated by a slight hesitation (miss) at 1/2 throttle, whether you are accellerating or not. This is a different hesitation than you'd see at cruise.

Generally, cruise hesitation is caused by pilot jets that are too small.
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