O.S. Engine OS25081306 Rotor Retaining Screw for 35R/C, 40SP, 40P, 50 RC Engines  [OS25081306]

O.S. ENGINES ROTOR SET SCREW 35R/C,40SP,40P,50
Price:
AUD$5.73
Brand:
O.S. Engine
Model:
OS25081306
Condition:
Brand New
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Rotor retention and engine balance

This rotor set screw is a direct replacement referenced by O.S. Engine OS25081306 and built for use with O.S. 35R/C, 40SP, 40P and 50 model engines noted in the product title. Its role is to fasten the rotor assembly to the crankshaft or drive hub in compatible small RC engines.

Intended purpose and role: the part supplies axial retention to preserve rotor timing and balance while running. It is a wear item and should be assessed whenever the engine is opened for tuning or repair.

Installation and service guidance: check the engine model codes listed before fitting, clean threads and seats, tighten until the rotor is secure with no axial play, and inspect for any thread or head damage during reassembly. Replace the screw where wear is present to avoid potential loosening during operation.

Will changing this screw affect engine timing or tuning?

If fitted correctly, the screw simply secures the rotor and will not alter timing; however any change in rotor position during fitting can affect timing so follow the correct installation steps.

How often should I replace the rotor set screw during tuning?

Inspect the screw at each major tune or rebuild; replace if threads show wear or if the head has been rounded from previous removals.

Any special notes for balancing after replacement?

After fitting a new screw, verify rotor runout and balance as part of your normal tuning checks to ensure no vibration is introduced.

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