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Does the bike with the huge dip in the dyno chart have CV carbs or Racing carbs?? Racing Carburetors don't really care what RPM you are at, all they see is engine vacuum. To figure out which carb component has the most effect when trying to cure a jetting problem you should take note of throttle position. Each component is related to a specific throttle position, not RPM. The following is a basic chart that shows which jet has the most effect on a certain throttle opening. Idle - 1/4 open Slow Jet/Fuel Screw 1/8 - 3/8 open Jet Needle Diameter & Needle jet 3/8 - 5/8 open Jet Needle Clip Position 3/8 - 3/4 open Jet Needle Profile (taper) 3/4 - 4/4 open Main jet / Main Air jet This is true for most mechanically operated carburetors, CV carbs are different as the slide is directly controlled by engine vacuum instead of your wrist. >> First I don't think that could be needle taper because generally >>needle taper affects 3000 to 5000 rpm, needle height affects 5000 >>to 7000 and the main jet affects 7000 on, that's from my jet kit >>instructions. ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com