YS Engine YSG1017 Rear Bearing for FZ70S Engine Maintenance  [YSG1017]

FZ70S Rear Bearing Details

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 supports the engine's rear crankshaft assembly, helping to keep rotation smooth and reduce axial play that can impair running consistency. Replace the bearing when you notice end-play, rough rotation, or contamination during disassembly.

Installation notes: remove the muffler and rear engine mounts as required, extract the crankshaft following the engine manufacturer's service practice, swap the bearing while checking shaft seating and seal condition, then reassemble carefully to the engine's original alignment. After replacement, run the engine gently to confirm free rotation and absence of abnormal noise.