The O.S. Engine Mixture Control Valve Assembly is a direct replacement specified for 60M-C and 91SZ-H carburettors fitted to RC glow engines. It enables mixture and idle adjustment without modifying the main carburettor body.
Fitment advice: confirm the carburettor matches the 60M-C or 91SZ-H specification before installation. Remove the carburettor with standard hobby tools, replace the valve assembly carefully, and verify smooth movement of the throttle linkage prior to refit.
Role in tuning: the valve influences mixture response and idle stability. Make measured adjustments and assess changes on a bench or run stand before full use to avoid adverse running characteristics.
Care and upkeep: check linkage and sealing surfaces for signs of wear, keep internal passages clean of varnish or deposits, and renew any degraded gaskets to preserve consistent mixture control.
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