Instructions for use

SETTING UP
NOTE. The high-speed set-up MUST be carried out before the idle speed is adjusted. Settings may change as the
engine “Runs in” and may need readjusting after the engine has been run for an hour or so.
1.
The main needle valve is used in the same way as on all model engines. It is used for adjusting the high-speed
set-up of the engine.
Start the engine and with the throttle fully open gradually close the needle valve until the engine is running at
its maximum speed. Caution, do not close the needle valve too far as this will “lean out” the mixture too much
and cause the engine to run too hot and slow down.
Set the needle valve just slightly on the rich side of the peak r.p.m setting.
Make sure that the engine is fully run in (about 1 hour of total running time in short runs) before operating
continuously at full throttle.
After setting the main needle valve it may be necessary to set the idle mixture to obtain reliable idle
performance.
2.
The mixture control centre needle valve is for adjusting fuel mixture at part throttle and idle speeds. Having set
the main needle as described above, close the throttle. The engine should idle continuously.
3.
If the engine idles unevenly, open the throttle, if the engine hesitates before picking up speed it is probable that
the idle mixture is too rich. Check this by closing the throttle and letting the engine idle for about 5 seconds
before again opening up. If the engine now puffs out a good deal of smoke and hesitates or even stops, it will
be necessary to close the mixture control centre needle valve. Do this by inserting a small screwdriver into the
recessed screw on the right hand side of the carburettor and turning it clockwise about ½ turn.
4.
If instead of being too rich, the mixture is too lean, the engine will stop when the throttle is closed, or will lose
speed while idling and then cut out abruptly (without smoking) when the throttle is opened again. In this case
turn the mixture control centre needle valve about ½ turn counter clockwise.
5.
The mixture control centre needle valve adjustment is not critical and by remembering the symptoms of rich
and lean running, mentioned above, it is a simple matter to get to the best setting.
6.
The throttle rotor set screw is for setting the minimum idling speed. If the engine runs too fast when the throttle
is in the fully shut position, the rotor set screw should be turned counter clockwise to allow the carburettor to
close down more.
SAFETY: THE THIRTEEN COMMANDMENTS
Please observe the following safety information: Your model engine is not a toy but a precision engineered motor,
which if abused, or if these safety precautions are ignored, is powerful enough to injure the user and / or
bystanders.
FORCE ENGINES ARE UNSUITABLE FOR USE BY PEOPLE UNDER 14 YEARS OF AGE.
1.
Keep onlookers at a distance of at least 5 metres when operating your engine.
2.
During initial running, mount the engine securely in an engine test stand / model, making sure that the engine
is secured firmly by means of 4 x high tensile (or equivalent) bolts.
FAILURE TO FIRMLY SECURE YOUR ENGINE CAN LEAD TO SERIOUS PERSONAL INJURY!
3.
Use a good quality, balanced propeller of correct size and pitch. See specification table for this information.
4.
Check propeller before installation and before each engine operation for any cracks or defects. Fit a new
propeller in you have any doubts. Ensure that the propeller type matches the rotation of your engine and that
the propeller is bolted securely to your engine using a propeller wrench.
5.
Keep face and body clear of the propeller when starting the engine. Use only a “Chicken stick” or an electric
starter to crank the engine. Never use your finger to start a model engine!
6.
Make all engine adjustments from behind the motor, keeping your body and clothing away from the rotating
propeller. Do not wear loose clothing or neckties.
7.
To stop the engine, close the throttle or disconnect the fuel tubing from the carburettor. Never put anything into
a rotating propeller.
8.
If you carry your model plane with the engine running, ensure that the aircraft is held securely at length, with
engine and propeller facing away from your body as far as possible. Do NOT run engine in an area with loose
sand or gravel, or in an enclosed space or indoors. Models should NEVER be flown in built-up areas, near
children, or near high tension cabling or electric and telegraphic wiring.
9.
Store fuel in a safe place and keep well away from heat sources, sparks and cigarettes.
10.
Model engines generate a lot of heat when they run. Avoid touching your engine until it has cooled.
11.
Model flying should only be carried out in approved places. This is usually the local model flying field.
12.
Newcomers to model engines must read all instructions and safety warnings before running an engine. If you
have any doubts about safe operation, seek advice from your local model shop or from where the engine was
purchased.
13.
Never disassemble your model engine. This will void any existing warranty agreement. Only the authorised and
appointed Force Engines service agent should carry out servicing and repairs. Please enclose details of the
problem. Fuel and propeller size used, along with a copy of purchase receipt.