FS-120SIII and FT-300 Replacement Rocker Arm OS45561110 by O.S. Engine  [OS45561110]

O.S. ENGINES ROCKER ARM FS-120SIII,FT-300
Price:
NZD$23.30
Brand:
O.S. Engine
Model:
OS45561110
GTIN:
4531028123533
Condition:
Brand New
Write a review

Designed for FS-120SIII and FT-300 engines

The O.S. Engine rocker arm OS45561110 matches the FS-120SIII and FT-300 engine designs shown in the product title. It transmits camshaft motion to the valve train and is intended as a service spare for glow-powered RC models.

Before fitting, verify the engine code shown in your unit since compatibility is limited to the listed engine designations. The part ships as a single pcs rocker arm suitable for replacement of a worn component within the specified assemblies.

Installation involves small-engine teardown and basic competence with tiny bearings and fasteners; use correct thread locking and torque control during refit. After fitting, inspect valve clearance and timing to confirm consistent operation when tuning the engine.

What are the stepwise installation highlights for this rocker arm?

Careful disassembly of the cylinder head and rocker assembly, replacement of the old part with OS45561110, and reassembly with correct torque and thread locker are the main steps.

Do I need special bearings or seals when fitting this part?

In most cases existing bearings and seals can be reused if they show no wear; replace any worn items to maintain reliable valve operation.

How should I verify correct valve timing after installation?

Rotate the engine by hand to observe valve movement and check clearance; fine adjust rocker geometry and perform a running test during tuning to ensure proper timing.

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