FSa-81 Crankshaft OS44802000 for O.S. Engine Replacement and Tuning  [OS44802000]

FSa-81 crankshaft role and OS44802000 reference

The O.S. Engine OS44802000 identified as Crankshaft FSa-81 is offered as a replacement part for RC engine rebuilds where the FSa-81 code applies. The following notes are aimed at racers and hobbyists preparing the crankshaft for installation and tuning work.

Source information lists the part by model number only, so explicit model-to-engine compatibility is not provided. Verify journal diameters, locating features, and stroke orientation against the original component to ensure correct timing and seal placement. Dimensional confirmation is essential for reliable tuning outcomes.

Installation guidance: treat this crankshaft as part of a full rebuild checklist—inspect and, where needed, renew connecting rods, bearings, and seals. Maintain any original indexing marks and apply correct torque values to fasteners to preserve engine balance and performance.

Install the OS44802000 only when part codes indicate FSa-81, and confirm all dimensional fits before final assembly and tuning.