The preferred setting window is between 1 and 2 turns. Continue backing the airscrew out until the engine idles at its highest RPM. Screw, to allow the engine to catch up with the adjustments). Next turn the airscrew all the way in until it bottoms out, once bottomed out slowly back the screw out a ¼ turn at a time (give the engine 10-15 seconds between each ¼ turn of the Then turn the idle up so it is idling about 500 RPM’s higher The ideal procedure for setting the screw in the correct position is to warm up your scooter engine to the proper operating temperature. Proper adjustment of the airscrew can offer direct feedback on the necessary setting required for the pilot jet. The airscrew works with the pilot/slow speed system of the carburetor, mainly affecting the engines initial starting, The carburetor to be slightly adjusted for variances in atmospheric conditions. ![]() ![]() ![]() The airscrew is a fine-tuning adjustment designed to allow The air screw is a small (5mm in diameter) slotted brass adjustment screw located on the inlet side (air filter side) of the carburetor.
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