O.S. Engines 21RG-X - Manual (Page 9)

16
0.3 0.5mm
Use the same fuel as is to be employed for all initial
running and containing NOT LESS THAN 18%
lubricant.
Temporarily remove the glowplug to check that it
glows bright red when energized.
Open the Needle-Valve 3 turns
from the fully closed position.
Switch on the transmitter and receiver
and set the throttle very slightly
opened from the idling position.
Re-check the needle-valve and
throttle settings. Turn the needle-
valve clockwise slowly and gently
until it stops. This is the fully closed
position.Do not use force to turn the
needle-valve beyond this point.
•
•
•
•
Open
Close
Needle Valve
•
STARTING THE ENGINE & RUNNING-IN ('Breaking-in')
For long life and high performance, every engine needs
to be properly 'run-in' or 'broken-in'. The running-in
procedure for this engine can be carried out with the
engine installed in the model. Be sure to use a muffler
pressurized fuel system. The running-in procedure is
as follows. DO NOT energize glowplug,
but apply electric starter to
draw fuel to carburetor.
Now connect glowplug battery
lead to heat the plug filament
and start the engine.
•
•
In case of the 21RG-X and
21RG(P)-X
Push the choke button on
the fuel tank several times to
deliver the fuel to the
carburetor. (Do not over-
prime or the recoil starter
cannot be pulled.)
Pull the starter handle
briskly straight out several
times to start the engine.
•
•
Glowplug
Starting battery
Rotating
Direction
Rear
Starter Handle
Front
17
30º
When the engine starts, first allow it to operate in short
runs on its very rich starting settings, with the glowplug
battery still connected and with its 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.
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.
Needle
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.
•
•
•
30
º
30
º
To stop the engine, close the throttle to idling speed,
then shut it off completely with the trim lever on the
transmitter. To cut off the fuel supply, pinch the fuel
delivery tube to the carburetor.
•
If the engine should need to be disassembled (e.g.
for cleaning or minor parts replacement) it is
advisable to return the Needle-Valve to the original
rich, starting setting and check whether further
running-in time is required before the car is raced
again. In the event of any major working parts (e,g,
piston/cylinder liner assembly) being replaced, the
complete running-in should be repeated.
Remember!
It is vitally important to set the
throttle at the correct position
before attempting to start the
engine.If the engine is
allowed to run with the
throttle too far open under
"no load" conditions, it will
rapidly overheat and may be seriously damaged.
Remember! Repeat this procedure until 5 more tanks of fuel have
been consumed, during which time the throttle may
be opened for brief bursts of increased power. If the
engine stops at medium speeds, close the Mixture
Screw 30˚.