The O.S. Engine OS45582521 is supplied as an FSa-110 70N regulator spring for RC engine regulator assemblies. Its 70N preload sets the mechanical baseline the regulator must overcome, affecting steady rpm control under changing loads.
The spring acts as the counterforce to the regulator linkage, so its rating directly affects how aggressively the governor holds or releases throttle. Switching to the 70N rating will shift the regulator's neutral point and reaction profile compared with other strengths.
Fitting guidance: install OS45582521 into the FSa-110 spring seat ensuring the spring sits upright and lines up with the regulator arm and linkage. Conduct restrained starts or bench trials after fitting to verify idle and governor action. Clean surrounding parts and confirm free movement of linkage pins to avoid binding.
Durability and selection: choose this 70N unit when you need reliable, mid-range tension. If unexpected idle or sluggish engagement occurs, recheck seating and linkage alignment before considering a different rating. Adjust gradually and observe the engine response to determine suitability.
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