O.S. Engine OS23181100 Carburetor Body - 21K & 35AX Compatible  [OS23181100]

Compatibility and replacement for 21K and 35AX

The O.S. Engine OS23181100 carburetor body is supplied as a replacement part for carburettor assemblies designated 21K and 35AX. It forms the principal casing that secures throttle and idle passages and links to the carburettor mounting points.

To preserve compatibility, transfer needle assemblies and inspect gaskets during the swap: remove the carburettor, replace the body, then reassemble making sure throttle linkage and studs align correctly. After fitting, check for intake leak paths and confirm the throttle travels cleanly.

Maintaining proper gasket condition and correct seating prevents air leaks that can upset idle and mid-range response. Use this body when fitting a service replacement or when verifying fit across multiple carburettor assemblies.

Keep replacement gaskets ready, work in a dust-free area, verify linkage alignment, and run a bench test to confirm fitment before refitting the carburettor to the engine.