O.S. Engines 21XZ-B - Manual (Page 11)

20
The following procedure is suitable for this
engine when the O.S. T-2060WN tuned
silencer and a fuel containing 30%
nitromethane are used.
Fill the tank completely with fuel.
Temporarily remove the glowplug to check
that it glows bright red when energized.
Glow Plug Igniter
Pliers
Element glows when energized.
Replace the plug when the
element does not glow or is
burnt out.
Turn the needle-valve clockwise until it stops. This
is the fully closed position. Do not force it to turn
further.
Needle Valve
Open
Close
approx 0.5mm
The carburetor is set as shown below at the
factory. Start the engine as it is.
The needle-valve is set approx. 3 and 1/4
turns opened from the fully closed position.
Throttle is set approx. 0.5mm open.
Approx. 0.5mm open factory setting with the
reducer removed
21
Metering needle and mixture control valve
are set at basic position. (Refer to P26.)
Turn the engine with starter box to draw fuel
into the engine.
Fuel
Deliver fuel into the carburetor.
Fuel tank side
Now connect glowplug battery lead to heat
the plug filament and start the engine.
Switch on the transmitter and make sure
that each linkage moves correctly.
approx 1mm
Set the throttle opening a little wider that the
factory setting by adjusting the Throttle Stop
Screw.
When the engines does not start or stops
right after being started, try the followings.
Set the needle-valve approx. 3 turns open
from the fully closed position. Do not force
the needlevalve to turn beyond a lightly
closed position.