FZ70S Rear Bearing Upgrade YSG1017 Compatible Replacement by YS Engine  [YSG1017]

FZ70S Rear Crankshaft Bearing Overview

The YS Engine YSG1017 rear bearing is provided as a direct spare for FZ70S-configured RC engines. Supplied as one pcs spare, it is intended strictly as an accessory for hobby engine servicing.

The bearing's purpose is to stabilize the rear crankshaft, promoting smooth rotation and reducing axial play that can compromise running quality. Replace the unit if you notice end-play, rough rotation, or signs of contamination when the engine is dismantled.

Fitment notes: remove the exhaust and rear mounting hardware as necessary, extract the crankshaft using recommended service procedures, install the replacement bearing while verifying shaft seating and seals, then reassemble to the original alignment. Run the engine gently after service to confirm free rotation and that no unusual sounds are present.