![]() ![]() Some older carburettors contain a high speed mixture screw, near the throttle plate and opposite the idle speed screw. Then, repeat the idle mixture screw adjustments from Step 4 to fine-tune the mixture. With the engine running at idle, hold the throttle lever against the idle speed screw to bring the engine speed to "true idle".Using a tachometer to gauge engine speed, set the idle speed screw to bring the engine to 1750 RPM for aluminum-cylinder engine or 1200 RPM for engine with a cast-iron cylinder sleeve.Finally, turn the screw back to the midpoint. Turn the screw in the opposite direction until the engine again begins to slow. ![]() Then, turn the idle mixture screw slowly clockwise until the engine begins to slow.
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