We understand your concern Mike, but the theory bihind jetting is pretty simple. Change your airflow, and the jetting requirements change.

If you want to see this in action you should check into some of the manufacturers websites. Some have been kind enought to suply Dyno run results, but the more important thing to tune into is Air/Fuel ratios.

When you go from a fairly free and or open flow system to a more restrictive one, the air flow naturally decreases. The fuel flow in this system does not decrease at the same ratio. You end up rich when you do not change jetting and reduce airflow. The inverse is true when you open up airflow. You will end up lean if you do not compensate in your jetting setup.

If you leave your aftermarket accessories on, and change your jetting back to factory settings, you will be lean. The factory settings are designed to complement the airflow of the factory accessories, which you are no longer using.

With the mileage you are getting, you are clearly rich somewhere.

There are a lot of very experienced carb tuners on this site, who know this carb very well. The very best thing you could do would be to find out and post here what your settings are. For example, the main jet installed in your carb, the number of turns out your PMS screw is, and the size of your pilot jet (if no longer stock). I am sure you will get some very good advice about what to do next.

I am betting that with that kind of mileage your main is too large. Do you know if the guy who set the carb up installed an aftermarket needle? If he did not, he may have chosen to compensate with an oversized main jet.

It would help to know who's needle (or jet kit) was used for the rejet (if an aftermarket needle was used).

We want to help, but need to know more about your bike to do so.

GRAM<br><br>Post edited by: GRAM, at: 2005/02/22 01:05