| You need to adjust your idle mixture with the CO (carbon monoxide) trimmer. On this bike, the trimmer is a potentiometer located next to the EPROM chip socket inside the ECU. It has a range of about 3/4 turn, so be careful, if you try to turn it more, it'll break off. When you rotate the trimmer screw clockwise, the injector's duration is shortened so the mixture is leaned. Counterclockwise gives a richer fuel mixture. The default position is it's rotation mid-point.
The trimmer adds/subtracts a millisecond or so to each fuel pulse over the entire RPM range. So go easy, an eighth-turn on the screw is often all that's usually needed. Check the color of the inside of your tailpipes after a few hundred miles. They should be medium to dark grey, not black and sooty.
Alternatively, you can have your dealer adjust it using a CO analyzer. The factory manual calls out 1.5% CO for a stock bike to meet emissions regulations but goes on to say that best power is realized when full-throttle CO is in the 4-6% range. I have set mine to 4% at idle but I may experiment with lower values based on the advice from a couple of tuners. Your new exhaust system has likely placed you outside this range and the idling behavior has suffered.  |