YS Engine YSF9166 Regulator Body F91AC replacement part  [YSF9166]

Regulator Body for YS F91AC

This regulator body is a direct-fit spare designed for the YS F91AC regulator assembly used in RC-scale glow engines. It serves as the housing for regulator components and is intended as an exact replacement piece to restore proper assembly fit and alignment.

Installation is straightforward for hobby workshop use: remove the engine's regulator assembly, swap the body while keeping original seals and fasteners where possible, and verify alignment and sealing before fuel testing. Avoid improvising hardware or using the part outside model RC engine systems.

As a replacement component, its role is maintenance and repair rather than performance modification; use it to return a worn or damaged regulator assembly to service or to keep a spare on hand during field events.