OS28181600 Carburettor Mixture Valve for RC Nitro Engines - O.S. Engine  [OS28181600]

Tuning and fitment details for hobbyists

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. The unit gives an extra tuning point so you can trim mixture without touching the main needle assembly.

Consider this product a service replacement for carburettors rather than an engine rebuild part; it is aimed at modelers who want repeatable, controlled adjustments during setup. The emphasis is on correct fit and consistent running once adjusted at the field.

Installation guidance: take off the carburettor cover to access the mixture port, swap the old valve for the new one, and verify proper seating before making adjustments. Follow with short runs and gradual tuning to avoid overcorrection, and check for signs of fuel seepage.

Tuning use: employ the valve to improve idle stability and throttle transitions, recording each change so you can reproduce successful settings across runs. This keeps experimentation reversible and measurable.