Carburettor Mixture Valve Upgrade for 10A/10D/10J - O.S. Engine OS21285600  [OS21285600]

O.S. ENGINES MIXTURE CONTROL VALVE ASSEMBLY 10A,10D,10J
Price:
AUD$10.59
Brand:
O.S. Engine
Model:
OS21285600
GTIN:
4531028102026
Condition:
Brand New
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Mixture valve upgrade for 10A, 10D and 10J carburettors

This mixture control valve assembly is supplied under the O.S. Engine OS21285600 part number and is intended for RC carburettors fitted to 10A, 10D and 10J engines. It adjusts the flow characteristics so tuners can refine the air-fuel balance for better transient and idle behaviour.

The part is for model engine service only and must not be used on full-size machinery. It replaces the mixture valve component while retaining the carburettor's original geometry, so other parts are normally left unchanged.

Installation notes: carry out the replacement with the carburettor removed, keep track of small screws and seals, and use the original sealing pieces when reassembling. Verify settings on a bench and then perform cautious low-throttle checks on the model.

Tuning role: use this valve to smooth idle and improve midrange throttle transitions. Adjust slowly, note each change, and return to previous settings if behaviour worsens.

How should I approach tuning after fitting this valve?

Start with small needle adjustments and test the response at idle and part throttle. Record each change and proceed stepwise; large moves can mask the true effect of the valve change.

Will this valve affect midrange throttle feel?

Yes. The valve alters mixture delivery that influences midrange transient response. Expect noticeable differences, so tune in small increments and validate under the conditions you normally run the model.

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