Adjust the screw on top at slow idle where the engine runs the best. Set the bottom screw at 1 1/2-2 turns open. Then with the engine warmed up real good and the throttle set wide open,very slowly turn the screw in until the engine starts to lose RPMs. Then slowly open the screw until the engine runs rich. Usually about 1 1/2 open . Then split the difference.----Then repeat the process to fine tune it.Slow idle speed should be set at 600 RPM.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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