This O.S. Engine OS45582521 spring is the FSa-110 70N replacement for regulator housings on RC engines. The 70N rating defines the preload applied to the regulator linkage and therefore influences how the governor holds engine speed when load varies.
In operation the spring supplies a defined resisting force against regulator movement; that force alters how readily the regulator lets the throttle open or close, so swapping spring ratings will change transient response and steady rpm control.
Fitment tips: the OS45582521 must sit squarely in the spring cup and align with the regulator arm and linkage. After fitting, carry out restrained engine runs or bench checks to confirm idle stability and governor responsiveness. Remove debris and verify smooth pivot action on linkage pins to prevent catch points.
Tuning advice: use the 70N spring for a balanced, firm baseline tension. If the engine exhibits a high idle or lagging governor response, verify seating and linkage geometry before moving to another spring. Make small adjustments and log results for clear comparison.
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