This governor extension spring is a heavy-duty mechanical component engineered to maintain precise engine speed regulation for MG340 and MG390 gasoline utility engines. Made from premium, high-tensile spring steel, it delivers the consistent tension necessary to resist deformation under high thermal and mechanical stress.
Physical Features & Design
* Dual-End Hook Configuration: Engineered with a specialized asymmetric setup—featuring one short, tight hook and one elongated straight shank hook—allowing it to clear surrounding throttle components and bridge the specific distance between the governor arm and the control lever.
* Corrosion-Resistant Coating: The wire body features a zinc-plated or galvanized finish to prevent rust and degradation from exposure to fuel, oil, and outdoor weather environments.
* Precision Coiling: Tight, uniform coils provide linear spring rate resistance to counter the force of internal governor weights, keeping engine RPM stable under load transitions.
Functional Operation
This spring functions as the crucial "counter-force" in an engine’s speed management system. As the engine takes on heavy workloads (such as running a water pump or commercial generator), the governor system pulls against this spring to open the carburetor throttle valve. When the load drops, the spring pulls back to close the throttle, preventing the engine from surging, hunting, or over-speeding.
Technical Specifications
* Overall Length: Approximately 5.5 inches (end-to-end)
* Coil Body Length: Approximately 2.25 inches
* Compatible Engine Displacements: 337cc to 389cc (11HP to 13HP utility engines)
* Common OEM Part Cross-Reference: Equivalent to [Part Number 16561-ZE3-000]
