Cars & Vehicles Auto Parts & Maintenance & Repairs

How to Adjust the Idle Screws on a Carburetor

    • 1). Place your motorcycle in neutral and start the motor. Let the motor run for a few minutes to warm up. Once warm, take note of the motorcycle's engine idle speed. Most motorcycles require an idle speed of 1,100 to 1,300 RPM (revolutions per minute) to operate properly at a standstill.

    • 2). Turn the idle screw slowly using a screwdriver, twisting the screw counter-clockwise to lower the motor's RPM or clockwise to increase RPM. Stop adjusting the screw when the tachometer indicates the desired RPM range.

    • 3). Twist the throttle open a few times and observe the tachometer needle as the RPMs fade. The needle should return to the desired idle speed. If not, readjust the idle and test it again.

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