FZ53 Regulator Screw Set YSF5172 for YS Engine  [YSF5172]

Replacement regulator screws for FZ53 engines

This is a direct replacement set of regulator screws listed as YS Engine YSF5172 for the FZ53 series. The screws are intended for RC-scale engine regulator assemblies and are fitted when original fasteners are worn, lost, or due for replacement during routine maintenance.

The primary function of these screws is to hold the regulator housing and its linkage securely. Installation is simple: remove the old fasteners, align the regulator assembly, and install the replacement screws with the correct driver to avoid damaging the heads. Tighten to a sensible torque and recheck regulator alignment after fitting.

These screws do not change carburetion or timing by themselves, but they ensure the regulator stays correctly positioned for consistent setup and safe engine operation. Carry spare screws in your parts box to minimise workshop downtime.