YS Engine YSS2021 56SR Carburetor O-ring Replacement for YS Carburetors  [YSS2021]

YS Engine Carburettor O-ring Replacement

Sold under the YS Engine YSS2021 code and identified by the 56SR mark, this O-ring is a replacement sealing element for model carburettors. It is intended to stop fuel seepage and help keep idle stable with consistent fuel delivery while the engine runs.

The item is designed for normal maintenance and repair duties when the original seal has hardened, split, or lost its elasticity. Installing a fresh ring restores sealing integrity and reduces leaks that can affect jetting and throttle response.

Fitting advice: inspect mating faces for wear and contamination prior to fitting the O-ring, renew any damaged clamps or fittings, and ensure the seal is seated correctly without overstretching. After installation, confirm there are no fuel restrictions and only adjust needle settings once the system is confirmed leak-free.