hi on my carb there is a screw with a spring which when u turn it in make the bike rev more nd wen u turn it out revs lower. there is also a screw on the airbox/carb if i screw in/out will this improve the bike performance? do these screws have anything to do with the mixture? aslo i had a black spark so if these have anythink do do with the mixture can sum 1 please tell me how to adjust thanks
The first screw is the tickover speed screw, and the second one is the idle mixture screw which should be set 1 turn out from fully in. Neither will improve the performance of your bike, no matter how they are set. A sooty spark plug is a sign of a rich mixture, so adjust the idle mixture screw and check your air filter for cleanliness.
John
July 2009
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