S-15 20K,21D,21VZ-R Carburettor O-ring Seal - O.S. Engine OS23715000  [OS23715000]

Service seal for RC carburettor units

This O-ring gasket serves as a compact replacement designed for the specific carburettor codes listed in the product title. It provides a sealed joint between carburettor components to help stop fuel seepage and support consistent fuel metering in model engines.

Compatibility is confined to the model codes shown in the product title, so confirm the carburettor code on your RC engine prior to ordering. The part is supplied as a spare sealing element for fitting into existing carburettor housings rather than a full carburettor assembly.

To fit the seal, remove the carburettor as required, inspect and clean the mating surfaces, fit the replacement O-ring without twisting or stretching it, and reassemble carefully. A correct seal reduces the chance of fuel leaks and helps sustain a stable idle during setup and maintenance.