O.S. Engine OS23181200 Carburettor Rotor 21K 35AX  [OS23181200]

Carburettor rotor for RC engines

This carburettor rotor is an RC-scale replacement rotor supplied under the O.S. Engine line and identified by model OS23181200. It is intended as a direct component for carburettor assemblies in compatible O.S. Engine carburettor series, serving the mechanical role that controls airflow metering and mixture response within the carburettor body.

In practical terms this rotor affects throttle progression and needle response, so it is used when restoring smooth travel or correcting inconsistent idle and mid-range behavior after wear or damage to the original rotor. The description focuses on fitment, handling, and its role during tuning rather than on unverified specifications.

Installation notes: inspect the carburettor shaft and housing for wear before fitting, align the rotor carefully to the control shaft spline, and avoid forcing the part into position. After installation, verify idle and throttle response on a bench setup before running, and make small mixture adjustments to re-establish baseline settings.

Maintenance and checks: look for grooves or scoring on the rotor face and shaft interface, ensure free rotation without binding, and replace if excessive play is present. Keep small parts organized during disassembly and use appropriate tools to avoid damage to the carburettor housing.