YS Engine YSF5172 Regulator Screws — Replacement for FZ53  [YSF5172]

FZ53 regulator fasteners overview

This item is a replacement set of regulator screws identified as YS Engine YSF5172 for the FZ53 family. They are intended for use in RC engine regulator assemblies where original screws have failed or been misplaced during maintenance cycles.

The screws hold the regulator housing and linkages in place. To install, remove the old fasteners, position the regulator correctly, and fit the replacement screws using the proper driver to preserve screw head integrity. Apply a measured torque and inspect alignment once installed.

While the screws do not alter carburettor settings or ignition timing, maintaining secure regulator positioning is important for repeatable engine setup and reliable operation. Keeping spare screws on hand reduces interruptions at the bench or track.