O.S. Engine OS23181100 Carburetor Body 21K 35AX replacement carburettor body  [OS23181100]

Carburetor body for 21K / 35AX

This O.S. Engine OS23181100 carburetor body is an RC-scale replacement part intended for use with carburettor assemblies labeled 21K and 35AX. It serves as the main housing element that secures throttle and idle passages, and interfaces with the carburettor's mounting and linkage system.

Installation is straightforward for those familiar with nitro engine carburettors: remove the carburettor from the engine, swap the existing body with this unit while preserving gaskets and needle assemblies, then reassemble ensuring alignment of throttle linkage and mounting studs. Check for vacuum leaks at the intake joint after installation.

In tuning contexts the carburettor body affects how external components mount and seal; maintaining correct alignment and gasket condition helps retain consistent idle and mid-range response. Use this part when replacing a worn or damaged body or when restoring a carburettor to serviceable condition for testing and track-day preparation.

Keep spare gaskets and a clean work area when fitting this body, verify throttle movement across the full travel, and perform a controlled bench test before reinstalling on the model.