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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