YS Engine YSS2021 Carburetor O-ring 56SR replacement seal for YS carburetors  [YSS2021]

Carburetor O-ring for YS engines

This O-ring is an RC-scale carburetor seal supplied under the YS Engine YSS2021 designation and identified by the 56SR marking. It serves as a replacement sealing element for carburetor assemblies to address fuel seepage and to help preserve stable idle and consistent fuel delivery during model operation.

The part is intended for routine maintenance and repair of model engine carburetors where the original O-ring has hardened, cracked, or lost elasticity. Use it to restore sealing surfaces and reduce the risk of leaks that affect tuning and throttle response.

Installation notes: inspect mating surfaces for wear and contamination before fitting the O-ring, replace any damaged clamps or fittings, and ensure proper seating without overstretching the seal. For tuning stability, confirm there are no fuel line restrictions and adjust needle settings only after confirming a leak-free installation.