Replacement Rear Bearing YSG1017 for FZ70S by YS Engine  [YSG1017]

Rear Crank Bearing for FZ70S Engines

The YS Engine YSG1017 rear bearing serves as a straightforward replacement part for FZ70S-style RC engines. Packaged as one pcs spare, it is sold as an aftermarket component for hobby engine care.

Its role is to support the rear end of the crankshaft, ensuring steady rotation and limiting axial movement that can affect run stability. Inspect the bearing whenever you detect play, rough turning, or contamination inside the housing.

Installation guidance: detach the muffler and rear mounts if needed, withdraw the crankshaft following recommended service steps, replace the bearing while checking shaft alignment and seal condition, then rebuild the engine to factory alignment. After fitting, run the engine lightly to verify smooth operation and no unusual noise.