YS Engine YSG1017 Rear Bearing FZ70S replacement rear bearing for RC engine maintenance  [YSG1017]

Rear bearing for FZ70S

The YS Engine YSG1017 rear bearing is a direct spare intended for service and routine replacement on FZ70S-design RC engines. It is supplied as a single pcs spare component and is described here strictly as an RC-scale accessory for hobby engine upkeep.

This bearing serves the basic role of supporting the engine's rear crankshaft assembly, helping to maintain smooth rotation and reduce end-play that can affect running consistency. Replace the bearing when you detect axial play, rough rotation, or contamination during disassembly.

Installation notes: remove the muffler and rear engine mounts as needed, extract the crankshaft following the engine maker's service practice, swap the bearing while checking shaft seating and seals, then reassemble carefully to the engine's original alignment. After replacement, run the engine gently to confirm free rotation and no abnormal noise.