1999 Copper/Silver Busa runs too rich...


I have a 1999 Busa with 21000 miles that is using too much gas. The last three tanks have been 20 mpg. It did get much better. I had the throttle bodies adjusted. Since then, they are synched, but only 20 mpg. I can smell a strong exhaust and see a little black powder build up inside the Yoshis. I know that bad fuel injectors and spark plugs can contribute to this. However, after I begin moving, the bike has great power and doesn't cut out at all. Only when idling. It has a galloping roll like a harley. Will removing the PAIR valve help?
Last edited: