60M-C & 91SZ-H Mixture Control Valve Assembly - OS29181610 by O.S. Engine  [OS29181610]

Mixture control valve unit

This Mixture Control Valve Assembly from O.S. Engine is a direct replacement part specified for use with 60M-C and 91SZ-H carburettors on RC glow engines. It acts as the interface for adjusting fuel/air mixture and idle behaviour without modifying the carburettor body.

Fitment: confirm the 60M-C or 91SZ-H carburettor form factor before installation, since the valve is intended to match those carburettor housings and linkage points. Use standard hobby tools to remove the carburettor from the engine, swap the valve assembly, and verify smooth throttle movement before reinstallation.

Tuning role: this valve assembly controls mixture response and idle stability. Small, incremental mixture changes will influence throttle transition and low-RPM performance, so test adjustments carefully on a bench or run stand prior to field use.

Maintenance tips: inspect linkage and sealing surfaces for wear, keep passages clear of varnish or debris, and replace worn gaskets when servicing the carburettor to maintain reliable mixture control.