YS Engine YSS1017 Back Plate O-Ring replacement seals for engine back plates  [YSS1017]

This YS Engine YSS1017 back plate O-rings designed as service seals for RC-scale YS engine back plate joints. The parts are intended as routine replacement items for wear-prone sealing surfaces and should be treated as consumables during engine teardown and reassembly.

Installation is straightforward: remove the back plate, inspect the sealing groove for debris or damage, replace the old O-ring with a matching new ring from the pack, and reassemble ensuring the mating faces are clean and properly seated. Use appropriate lubricant where recommended by your engine manual to ease fit and reduce the risk of tearing during installation.

In tuning and maintenance workflows, fresh O-rings help preserve crankcase pressure and prevent fuel or oil leaks that can affect running consistency.