O.S. Engine OS29088320 Adjustable Mixture Control Valve for 61F & 61G Carburettors  [OS29088320]

Precision Mixture Control Part

This adjustable mixture control valve assembly is intended for the 61F and 61G carburettor formats and provides a factory-style interface for altering the air-fuel delivery to the engine. It is offered as a spare or upgrade component to refine engine response and tuning.

To install, follow standard carburettor service steps: remove the top or cover as outlined by your engine maintenance instructions, position the valve assembly in the original seat, and confirm linkages and fixings are secure. Verify compatibility with the 61F or 61G layout before proceeding.

For tuning, make incremental micro-adjustments and evaluate the engine in controlled runs. Allow the engine to stabilise at normal operating temperature before finalising mixture settings, and replace or reapply any recommended sealants or thread locking materials during reassembly.

Maintenance guidance: check the valve assembly for deposits during carburettor servicing, clean using appropriate non-reactive solvents, and renew any seals that show wear. This is a model-scale accessory only.