O.S. Engine OS25881100 Carburettor Housing 40L 55HZ Replacement  [OS25881100]

Carburettor shell for nitro model engines

This O.S. Engine carburettor body is a scale spare intended for use in nitro-powered model engine carburettor assemblies. The unit is identified by size/code 40L 55HZ and model number OS25881100 to help match parts for repair or rebuild work.

The part acts as the carburettor shell that links to throttle mechanisms and jets, influencing fuel metering, idle behaviour and mid-range throttle feel. It is supplied as a single spare component rather than as a full carburettor kit.

Fitting the body requires basic disassembly of the carburettor top and careful seating of gaskets and the needle; start with your original jets and needle settings and check for any air ingress after refit. Expect to check idle mixture and throttle transition since a replacement body can alter airflow and tuning balance.

Fit this spare when the existing carburettor body is damaged or worn, or when a like-for-like replacement is required to keep tuning and reliability consistent on nitro RC models.