The Low speed adjustment screw is the one marked as "L" and would be adjusted during:
1. Idle - to insure running smoothly, and
2. Acceleration - to transition from Idle to High Speed.
The High speed adjustment screw is the one marked as "H" and would be adjusted during:
1. High speed or Wide Open Throttle. Turn about 1/8 either way to gain top RPM's and then back off slightly.
The final screw is an Idle Set screw. This screw sets the actual speed of the Idle and is the screw attached to the end of the throttle cable as it terminates at the carburetor. Turning it:
1. Clockwise - increases RPM's (speeds up motor)
2. Counter Clockwise - reduces RPM's (slows down the motor)
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