Speed Adjusting Screw

Speed Adjusting Screw

A speed adjusting screw is a mechanical screw used to fine-tune or regulate the speed of an engine or a rotating component. It’s commonly found in systems such as:

• Carburetors: Adjusts the idle or maximum engine speed by controlling the throttle plate or fuel-air mixture.
• Governors (in small engines or generators): Alters spring tension to raise or lower the governed engine speed.
• Throttle bodies: Used to set minimum throttle opening, affecting idle speed.

Function:

The screw changes the position or tension of a mechanical component, thereby adjusting the fuel flow, airflow, or throttle opening — ultimately controlling the rotational speed or idle speed of an engine.

Typical Applications:

• Lawn mowers
• Motorcycles
• Generators
• Older vehicles with mechanical throttle systems

Related Terms:

• Idle speed screw
• Throttle stop screw
• Governor spring adjustment screw