Instructions for use

1.
Install the engine in a suitable bench mount. Use a 10 x 6 or 11 x 6 propeller and run the engine for
approximately 10 minutes with the needle valve adjusted so the engine is running rich “four stroking”.
2.
Close the needle valve until the engine speed picks up and the engine starts to “two stroke”. Allow the engine
to run like this for about 30 seconds only and then re-open the needle valve until the engine resumes four
stroking. Run for a further 2 minutes.
3.
Repeat this procedure, alternately running the engine fast and slow by means of the needle valve. Gradually
extend the periods of high speed running until a total test running time of 30 minutes has been achieved. Using
this method of running alternatively rich (cool) and lean (hot) helps the engine to run in.
4.
Now gradually close the needle valve until the engine reaches its maximum r.p.m. and then open the needle
valve very slightly as a safety margin. If, at this stage, the engine holds a steady speed then the initial running
in is complete. If the engine will not hold a steady speed extend the running in period as necessary.
5.
After running in and before installing the engine in your model it is advisable to check carburettor adjustment.
Refer to the separate carburettor instruction sheet.
INSTALLATION
Mount the engine securely on to the engine mounting using steel screws and locknuts. Particular care must be
taken to ensure correct alignment of the lugs on the engine mounting. An incorrectly mounted engine can give
rise to vibration and can also damage the engine itself. Special care must also be taken to ensure that mounting
holes in the engine and the mounting are correctly aligned so that the engine is not damaged when the
mounting screws are tightened.
FUEL
Use a good quality commercial fuel or one of the blends shown in the table. Fuel “A” is for ordinary use Fuel “B”
is for use where more power is required.
Use only Castor oil and Methanol of the highest quality and purity.
Synthetic lubricants are less tolerant of a “lean run” than Castor oil.
If a synthetic oil is used in a fuel mixture, the needle valve should be set a little rich as a safety measure in case
the engine runs too lean whilst in the air.
In Helicopter installations it may be necessary to experiment with different glow plugs and fuels to obtain
optimum mid range performance.
Whatever fuel is used the engine should be checked to ensure that it is sufficiently run in to operate
satisfactorily on the chosen fuel.
Do not use fuels containing less than 20% lubricant.
GLOW PLUGS
Select a plug that will give the most satisfactory results. We would suggest a medium cold plug for this engine.
PROPELLER
Use a well-balanced propeller only. You will need to experiment with propeller sizes, as performance will vary
depending on the model that the engine is fitted to.
Below is a chart of recommended sizes. This chart will give you a starting point for your experiments.
MAINTENANCE
1.
Avoid unnecessary dismantling of your engine.
2.
Always keep your engine clean and do not let dirt or dust enter the engine through the intake or the exhaust.
3.
Fuel should be filtered. Use a fuel filter on your fuel container and another filter in the fuel line from the tank to
the carburettor.
4.
If the engine is fitted with a flywheel instead of an aircraft propeller, do not allow the engine to run at peak
revolutions without adequate provision for cooling.
ADJUSTING THE CARBURETTOR
Three adjustable controls are provided on this carburettor.
1.
The main needle valve (located on the right hand side of carburettor) Part No MN4626 see overleaf
2.
The mixture control screw (centre needle valve) Part No CN4615 see overleaf
3.
The throttle rotor set screw (angled at rear of carburettor body) Part No S009 see overleaf
A
B
METHANOL
75%
65%
CASTOR OIL
20%
20%
NITROMETHANE
5%
15%
40 SIZE
46 – 51 SIZE
R/C STUNT
10 x 6 – 11 x 6
10 x 7 – 11 x 6
SCALE
11 x 6 – 12 x 4
11 x 6 – 12 x 5
R/C SPORT
10 x 6 – 11 x 6
10 x 7 – 11 x 6