Replacement Rocker Arm for FS-120SIII & FT-300 Engines OS45561110 O.S. Engine  [OS45561110]

O.S. ENGINES ROCKER ARM FS-120SIII,FT-300
Price:
£10.10
Brand:
O.S. Engine
Model:
OS45561110
GTIN:
4531028123533
Condition:
Brand New
Write a review

Service part for FS-120SIII and FT-300

O.S. Engine OS45561110 is supplied as a service rocker arm for the FS-120SIII and FT-300 engine designs referenced in the product name. Its role is to transmit cam action into the valve train for glow-powered RC models.

Fitment is limited to the engine codes listed, so confirm the engine designation before ordering. The product is supplied as one pcs unit suitable for replacing a worn rocker arm in the specified assemblies.

Installation involves small engine dismantling and some experience with miniature fasteners and bearings; use thread lock compounds and controlled torque values on reassembly. Check valve clearance and timing after installation to maintain reliable running during tuning sessions.

Can this rocker arm be fitted to other O.S. Engine models?

This rocker arm is intended for the FS-120SIII and FT-300 codes specifically; check cross-reference tables or engine markings before attempting to fit it to other models.

How often should I inspect the rocker arm for wear?

Inspect the rocker arm whenever you service the valve train or notice changes in engine running; replace at the first sign of excessive wear to avoid secondary damage.

What checks are recommended immediately after refitting?

After refit, verify valve clearance, rotate the engine by hand to confirm smooth movement, and perform a controlled running test while monitoring for irregularities.

Copyright © 2008-2026 rcjaz.co.uk All rights reserved