Description
Overview:
The Spring-Air Vane for Briggs & Stratton Quantum engines (OEM 790849) is a genuine replacement governor component that regulates airflow to control engine speed. It comprises a resilient spring made from spring steel paired with a lightweight moulded vane designed to react to cooling fan airflow. This action keeps throttle position stable, supporting smooth running and efficient combustion. Built to Briggs & Stratton specifications, it fits Quantum engines commonly found on walk-behind lawn mowers and similar outdoor power equipment, including the 625 and 650 series. Replacing a worn or heat-distorted vane or a fatigued spring helps prevent hunting and overspeed, improves starting behaviour, and restores reliable governor response for consistent performance in everyday use.
Key Features:
- Genuine Briggs & Stratton part for Quantum series; direct replacement for OEM 790849
- Durable spring steel and tough polymer vane resist heat, vibration, and fuel vapour
- Maintains stable governed engine speed under varying load for smoother operation
- Helps reduce hunting/surging and improves throttle response versus worn components
- Accurate vane geometry for consistent airflow sensing and governor linkage movement
- Straightforward fitting with standard hand tools; no special setup typically required
- Compact, factory-style form factor for reliable clearance inside the blower housing
- Suitable for routine service to extend engine life and preserve fuel efficiency
Typical Applications:
Used during maintenance or repair of Briggs & Stratton Quantum engines on walk-behind lawn mowers, garden vacuums, and other compact outdoor power tools. Replace when the engine struggles to hold revs, surges at idle, overspeeds under load, or after cleaning or rebuilding the carburettor and governor linkage to restore steady, dependable running.
Also known as:
Air vane spring, governor air vane, Briggs & Stratton governor vane, engine vane spring, Quantum air vane, airflow governor vane, cooling-fan vane actuator. These terms describe the small vane and spring that sense fan airflow and control the throttle via the governor link on Briggs & Stratton small engines.
Fits Models:
625, 650
Alternate Part Numbers:
790849, BS790849
Product Specifications
| L&S Part No. | BS790849 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Briggs & Stratton |
| OEM No. | B790849 |
| Unit of Sale | 1 |
| Machine Type | Engines |
