O.S. Engine OS23181100 Carburetor Body for 21K and 35AX Carburettors  [OS23181100]

Replacement carburettor body for 21K and 35AX

This O.S. Engine OS23181100 carburetor body is a direct replacement for carburettor assemblies marked 21K and 35AX. It serves as the main housing that secures throttle and idle passages and interfaces with the carburettor mounting and linkage fixtures.

Fitting is straightforward for anyone familiar with nitro engine servicing: remove the carburettor from the engine, swap the old body for this unit while keeping needles and gaskets in place, then reassemble making sure throttle linkage and mounting studs are aligned. After refit, inspect the intake joint for vacuum leaks and confirm smooth throttle action over the full travel.

For installation-focused work the body primarily ensures correct mechanical alignment and sealing; preserving gasket condition and correct linkage placement helps maintain consistent idle and mid-range response. Fit this part when the original body is worn or damaged or when preparing a unit for bench testing or track use.

When installing, keep spare gaskets to hand, work on a clean bench, verify full-range throttle movement, and perform a controlled bench idle test before returning the carburettor to the model.