FZ70S Back Plate Replacement YSG1044 - YS Engine  [YSG1044]

Replacement back plate for FZ70S

The YS Engine YSG1044 back plate is a dedicated replacement rear cover for engines carrying the FZ70S designation, designed to maintain crankcase sealing and keep internal components aligned during service.

Installation is suitable for hobby workshops: remove the engine from the model if required, drain fuel and clean external surfaces to prevent contamination, remove retaining screws, inspect the mating face and seals, transfer or fit new gaskets or O-rings as needed, align the back plate to the crankcase flange, and tighten fasteners evenly in a cross pattern to secure the seal. Check thread engagement and avoid over-tightening to prevent distortion.

As a service item, the back plate restores correct sealing and component placement; it is not a tuning part but it supports consistent engine behavior after rebuilds and during event preparation for RC nitro use.