Regulator Screw Replacement for FZ53 YSF5172 by YS Engine  [YSF5172]

Regulator mounting screws for FZ53

These are direct replacement regulator screws sold as YS Engine YSF5172 for the FZ53 series. They are designed for use in regulator assemblies on RC-scale engines where original fasteners are compromised or missing.

The screws secure the regulator housing and its linkages. To fit, remove the existing fasteners, align the regulator assembly, and insert the replacement screws with the appropriate driver to avoid damaging screw heads. Tighten carefully and verify regulator alignment after installation.

Fitting these screws does not change carburation or ignition timing, but it preserves regulator placement which is crucial for consistent engine setup and safe operation. Stash extras in your spares to reduce bench time when servicing engines.