Quote:
Originally Posted by skid jackson
06 300
What is the difference between keeping the 178 and raising the needle one clip or leaving the needle in the 3 position and putting a 180 in??
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The difference is in the throttle range that the needle and main jet are most effective.
The needle clip position has most effect between 1/8 and 1/2 throttle and the main jet has most effect between 1/2 and wide open, although their effective range overlaps.
If you raise the clip position on the needle you will make the mixture leaner between 1/8 and 1/2 throttle, if you drop the clip position you will make it richer.
So if you raise the needle (by dropping the clip) you'll make it richer mostly in the 1/8 to 1/2 throttle range, and if you but in a 180 main you'll richen it mostly in the 1/2 to full throttle range.
This diagram shows the effective range of each component.
http://www.keihin-us.com/tune1.htm