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

Service O-ring for YS Engine Carburetors

This item is supplied as the YS Engine YSS2021 carburetor O-ring, identified by the 56SR code. It is intended as a spare sealing element for carburetor assemblies to address fuel seepage and support consistent idle and fuel delivery while running models.

Designed for scheduled servicing and repairs, the O-ring replaces seals that have become stiff, cracked, or otherwise deteriorated. Installing the new ring renews sealing faces and helps prevent leaks that can upset jetting and throttle feel.

Fitment advice: clean mating surfaces and check for damage before fitting the O-ring, renew damaged clips or hose fittings, and fit the seal without overstretching. After fitting, confirm there are no fuel line restrictions and then fine-tune needles only when the system is leak-free.