O.S. Engine OS28181600 Carburettor Mixture Control Valve for RC Models  [OS28181600]

Refine idle and part-throttle behaviour

The O.S. Engine OS28181600 mixture control valve is an RC-scale carburettor replacement part designed to restore or refine fuel-air mixture control on nitro engine models. By adding a dedicated adjustment, it lets you fine-tune lean and rich settings without disturbing the main needle assembly.

This component is supplied as a carburettor service item rather than an engine overhaul piece; it targets modellers needing accurate, repeatable control during tuning sessions. The focus remains on correct carburettor fitment and ensuring stable running in both practice and event environments.

Fitment advice: remove the carburettor cap or access plate to access the mixture port, swap in the replacement valve, and verify a secure seat before making adjustments. After fitting, carry out short incremental runs to settle the settings and inspect for any fuel weepage.

Tuning guidance: employ the valve to adjust part-throttle response and idle smoothness; make measured changes and note results so that engine behaviour becomes predictable between runs. This approach keeps modifications reversible and controlled.