I've read lot of tuning tricks and dyno compares all around the net and in tech magazines,

lot of technicians have been able to extract from a tuned CV carbs a power very closed to flat slide carbs.

If you have good knowledge of the CV technology maybe you'll know all the variables to change to make a perfect carburetion at every RPM range and throttle open.

For example lot of people don't know that the number and diameter of holes in the emulsion tube are responsible for a lean condition of mid-revs.

The transition from low-revs to mid-revs is the range used by EPA for pollution statistics, and the bike producer has to tune a bike for low pollution and noise in that revs most used in the city.
Idle and hi-revs are less important because they are used only when waiting on trafic light (short time for a bike) and outside the city (for high-revs).

I use to modify CV closing some upper holes on emulsion tube (using epoxy resin) to obtain a bit richer condition without raise the needle.

A well tuned CV carb has a top power only slighty less than a flatslide, but with a smoother operation and better low/mid ranges.

Last edited by Mechano; 03/19/2007 1:59 PM.