O.S. Engines 32SX-MX - Manual (Page 14)

30˚ The position of the needle-valve
when starting the engine.
Needle
◆ Next restart the engine, disconnect the glowplug
battery and lower the boat into the water, gradually
opening the throttle sufficiently to prevent the
engine from stalling as the propeller takes up the
load. If the engine stops due to being over-rich,
close the needle-valve 30˚ and try again.
◆ Check that cooling water is being discharged(most
important) then release the boat and run it under
radio-control until one tank of fuel has been
consumed. Now close the needle-valve
approximately 30˚ and run the craft for another full
tank of fuel.Repeat this procedure until a total of 5
tanks has been consumed. If the engine stops at
medium speed, close the mixture control screw 45˚
to 90˚ and try again. The completion of this stage
marks the conclusion of the initial running-in period.
To stop the engine, close the throttle to idling
speed, then shut it off completely with the trim lever
of the transmitter or pinch the fuel delivery line. ◆
IF THE ENGINE FAILS TO START
Check the following:
Glowplug battery discharged or glowplug defunct.
Fuel not reaching carburettor.
◆
◆
◆ Engine flooded. Do not over-prime.(This could also
cause a hydraulic lock and damage the engine on
application of the electric starter.) Remove glow-
plug, close needle-valve and apply starter to pump
out surplus fuel.
ADJUSTMENT
Open the throttle slightly from the idling position
and start the engine, following the procedure de-
scribed previously.
Lower the boat into the water, gradually open the
throttle and run the boat straight ahead for 20 to 30
meters at full throttle. Now return the model and
close the needle-valve 20 to 30˚. Repeat the run,
taking note of the improvement in speed.
Continue with further runs, gradually closing the
needle-valve (20 to 30˚at a time) until no further in-
crease in speed is obtained.
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◆
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