FZ53/FZ63 Rear Back Plate Assembly YSF5144A - YS Engine  [YSF5144A]

FZ-series rear plate overview

This YS Engine back plate assembly is the replacement unit listed as YSF5144A and is matched to FZ53 and FZ63 engine models. It functions as the rear cover that secures internal components and restores correct rear-end alignment after disassembly.

Use this part when the original back plate shows wear, damage, or is being replaced during scheduled servicing. The assembly provides the seating surface for bearings and closes the crankcase rear; inspecting mating faces and seals during installation reduces the risk of leaks and misalignment.

Installation notes: confirm the back plate is for FZ53 or FZ63 before fitting, clean the mounting faces, and verify bearing seating and gasket condition when reassembling. Avoid overtightening fasteners and run the engine gently at low throttle after service to confirm clearances and secure fitment.

This replacement back plate assembly is intended as a workshop spare for hobby-grade RC engine maintenance, enabling straightforward restoration of FZ53/FZ63 rear-end integrity when the original part needs replacement.