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

Replacement carburettor rotor for RC engines

This carburettor rotor is an RC-scale replacement supplied under the O.S. Engine line and identified by model OS23181200. It fits into compatible O.S. Engine carburettor assemblies and performs the mechanical function that meters airflow and influences mixture response inside the carburettor body.

In hands-on terms, this rotor alters throttle progression and needle reaction, so it is typically used when restoring smooth throttle travel or correcting unstable idle and mid-range running caused by wear or damage to the original rotor. The description stresses fitment, handling, and its role during tuning rather than listing 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 organised during disassembly and use appropriate tools to avoid damage to the carburettor housing.