My new T9.9 is running rich and leaving a black exhaust streak down the rear of the motor. I can't find an adjustment screw to lean it out, just a screw to set the idle higher,etc. I stopped by the Yamaha dealer and guy at the counter said that I can not do it, that thing is sealed.
Anybody know the secret to leaning this thing out?
Anybody know the secret to leaning this thing out?