O.S. Engines 21VZ-R Turbo II - Manual (Page 6)

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LONG SOCKET WRENCH
Recommended for easy removal and
replacement of the angled and
recessed glowplug, the O.S.Long
Socket Wrench incorporates a
special grip.
SILICONE FUEL LINE
Heatproof silicone tubing of approx.
5mm o.d. and 2mm i.d. is required
for the connection between the fuel
tank and engine.
CARBURETOR CONTROLS
The Needle-Valve:
The Mixture Control Screw:
The Throttle Stop Screw:
For setting the minimum idling speed:
Four adjustable controls are provided on this
carburetor.
For adjusting the mixture strength when the throttle
is fully open.
For adjusting the mixture strength at part-throttle
and idling speeds, to obtain steady idling and
smooth acceleration to mid speeds.
Needle Valve
Mixture Control Valve
Assembly Screw
Throttle Stop Screw
NOTE: Readjustment may be necessary,
occasionally to allow for changes in fuel formula
gear ratio or clutch engagement point.
The Metering Needle:
Metering Needle
For changing the feeling at mid speads and
acceleration. (Do not rotate the screw more chan
one turn.)
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Use the same fuel as is to be employed for all initial
running and containing NOT LESS THAN 18%
lubricant.
STARTING THE ENGINE & RUNNING-IN ('Breaking-in')
Open
Close
Needle Valve
The following procedure is suitable for these engines
when the O.S. T-2040 tuned silencer and a fuel
containing up to 30% nitromethane are used.
For long life and high performance, every engine
needs to be 'run-in' or 'broken-in'. With care, running-
in of the MAX-21VZ-R Ver. can be carried out with it
installed in the vehicle. Be sure to install the air-
cleaner on the carburetor and to use a muffler-
pressurized fuel system.
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
(see sketch, top right).
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.
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•
•
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: