Back Plate O-Ring Pack 50 pcs for YS Engine YSS1017  [YSS1017]

Back Plate Seal O-ring Kit

This YS Engine YSS1017 back plate O-ring pack provides spare nitrile O-rings for sealing the back plate on RC glow engines. It is supplied as a bulk kit to support regular servicing and rebuild work.

Use notes: the rings seal the back plate interface to help preserve crankcase pressure and reduce fuel or crankcase leakage that can upset idle and throttle response. These are consumable maintenance items and do not change engine performance characteristics.

Installation guidance: inspect old O-rings for flattening or cracks before removal, lubricate replacement O-rings lightly with a compatible oil before seating, and make sure the back plate mating surface is clean and free of debris to avoid pinching or premature wear.

Packing: the product name indicates 50 pcs to provide a ready supply of replacements during routine servicing.