YS Engine YSG1017 Rear Bearing Replacement for FZ70S  [YSG1017]

Rear Bearing - FZ70S Service Notes

The YS Engine YSG1017 rear bearing is a dedicated spare for use with FZ70S-design RC engines. It is supplied as a single pcs spare and is intended solely as an accessory for hobby engine maintenance.

This bearing helps keep the rear crankshaft supported, maintaining smooth rotation and limiting axial play that can affect engine performance. Replace the bearing if you find end-play, rough turning, or evidence of contamination when disassembling the unit.

Removal and fitting notes: take off the muffler and any rear mountings required, remove the crankshaft in line with the engine maker's service instructions, fit the new bearing checking shaft seating and seals, and reassemble to correct alignment. After refit, run the engine carefully to check for smooth operation and absence of odd noises.