O.S. Engine OS22582100 Carburettor Body 21L 25AX replacement for RC nitro engines  [OS22582100]

Carburettor body for 21L/25AX

This is an RC-scale carburettor body from O.S. Engine designated OS22582100, intended as a direct service replacement for carburettors labelled 21L and 25AX. It serves as the structural housing for the carburettor assembly and defines the mounting and alignment for the throttle and idle circuits.

When replacing the carburettor body, work in a clean area and keep small components organised. Inspect the throttle shaft, gasket faces and mounting bosses for wear or burrs before assembly. Proper seating of the body ensures predictable throttle response and consistent idle characteristics on nitro RC engines.

For tuning, the body itself does not change jetting but affects how reliably the carburettor holds adjustment; confirm throttle linkage alignment and vacuum/synchronisation where applicable. Use manufacturer-recommended fasteners and avoid overtightening to prevent distortion of the mounting surfaces.