O.S. Engines FS-26S-C II - Manual (Page 9)

16
Prime the carburetor by
pressing the fuel tank
primer until fuel reaches
the carburetor.
Fuel
Deliver fuel into the
carburetor.
Fuel tank side
Now connect glowplug battery lead to heat
the plug filament and start the engine.
It is vitally important to set
the throttle at the correct
position before starting the
engine. If the engine is allowed
to run with the throttle too far open under ''no
load'' conditions (i.e. with the driving wheels
not in contact with the ground) it will rapidly
over-heat and may be seriously damaged.
Attention:
When the engine starts, first allow it to
operate in short runs at the very rich starting
settings, with the glowplug battery still
connected and the driving wheels clear of
the ground. The rich mixture will, under
these conditions, provide adequate
lubrication and cooling, indicated by profuse
smoke from the exhaust.
Next, disconnect the glowplug battery and
try running the car on the track. If the engine
stalls, open the throttle fractionally, but try to
keep the engine running as rich as possible:
if it stops because of being excessively over-
rich, close the Needle-Valve 30˚ and try
again.
17
Run the car on the track until one tank of fuel
has been consumed, then close the Needle-
Valve 30˚ and run the car for another full
tank of fuel. Repeat this procedure until 1/2
gallon of fuel have been consumed, during
which time the throttle may be opened for
brief bursts of increased power.
Needle
Now open the needle-valve 10
°
-20
°
from the
setting at which the highest straight line
speed is obtained. This slightly rich setting
should provide the optimum balance. Run the
car for about three more tanks of fuel to allow
fine-tuning of any final adjustments.
Re-adjust the throttle stop screw, if
neccessary, so that the car may not move at
idling.
The position of the needle-valve
when starting the engine.
Close the needle-valve
approx. 30
° after
running the vehicle for
one full tank of fuel.
Repeat this procedure
several times.
Optimum needle-valve position
(10
° to 20 ° opened from the position
where highest speed of the vehicle
is obtained.)
The position of the
needle-valve where
highest speed of
the vehicle is
obtained.
Notes
Running-in the engine with excessive rich
setting means nothing but damage the
engine. Run-in the engine with adequate
running temperature so that the heat can be
conveyed to all the internal parts.