O.S. Engine OS22081811 Replacement Rotor Retainer Screw for 10FSR,10/15/25FP,FS20,FS40,21,31,RE  [OS22081811]

Screw role and service notes

Designated O.S. Engine OS22081811, this rotor retainer screw is intended for the model codes shown in the product title. It secures the rotor assembly to prevent axial shift on compatible small RC engines.

Fit this part when servicing the crank and rotor area; correct installation maintains rotor alignment and supports stable running characteristics under load.

Installation notes: ensure the OS22081811 part number matches your engine documentation or the supplier listing before installation. Clean mating threads, use a properly sized driver to avoid rounding, and apply controlled torque. Excessive tightening can damage the screw head or threads. Inspect and retorque if necessary after initial engine operation.

Compatibility and ordering: always compare the OS22081811 reference with the parts diagram for your specific engine model and consult the seller for package quantity or inclusion details.