on the 4.1 , the idle screw is set just behind the carb in a black body ................ the brass one sticking up with a silver screw is top end speed .

you shouldnt adjust the top end till you have ran about 1-1/2 tanks through it



and the idle screw is anticlockwise to turn idle down and clockwise to turn idle up.


ps the one that sticks out the other side of the carb ( a silver screw set in a purple body ) NEVER TOUCH.......................