guys please help
evrything in my crf250x 2006 model is stock except for the yoshimura muffler (muffler only) no airbox or ccc mods.
current jettings
main jet 158
pilot jet 42
needle 5th clip position (red)
fuel screw 1 1/2 turn
altitude
sea level to 3000
my problem
spark plug has a black color ( i thnk this is to rich)
is there something wrong on my jettings?
thanks
alvin