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I N S TA L L AT I O N O F T H E
S TA N D A R D A C C E S S O R I E S
I N S TA L L T H E G L O W P L U G
Insert the included plug into the heatsink head carefully making sure that it is not cross
threaded before tightening firmly.
INSTALL THE INCLUDED EXHAUST GASKET.
One 0.1mm cylinder head shim and one 0.2mm head shim are installed in the engine when it
leaves the factory. An additional 0.1mm head shim is supplied with the engine. You may add
it for break in, when you are trying to achieve increased run time at the expense of a loss in
power, or if the glow plug tends to burn out due to high temperature and/or high humidity.
I N S TA L L I N G T H E C A R B U R E T O R R E D U C E R
Choose the reducer according to the track conditions.
• 7mm Installed from the factory.
• 8mm Included in package.
I N S TA L L AT I O N O F T H E D U S T C A P S E T
If the engine is going to be stored, install the included exhaust and carburetor dust caps to
prevent debris or other foreign matter from getting inside the engine.
Piston
Cylinder Liner
Crankshaft
Near TDC
Slight taper
When the engine is cold.
When the engine is hot.
Low Speed Needle
(Metering Needle)
Idle Screw
(Throttle Stop Screw)
Mid Needle
(Mixture Control Valve)
High Speed
Needle
(Needle Valve)
Thermo Insulator
Carburetor Restrictor (Venturi)
Ball Link
Slide Boot
Exhaust
Gasket
Glowplug
Retaining Screw
O-Ring
O-Ring
Do not allow
bottom of crankcase
to touch chassis
Chamfer inside edges of bearers
Rotate the retainer
nut gently until it stops
Tighten a further
120º - 180º
High Speed
Needle
Open
Close
approx 0.5mm
Element glows when energized
Pliers
Replace the plug when the
element does not glow or is
burnt out.
Glow Plug Igniter
Turn the high speed needle clockwise
until it stops. This is the fully closed
position. Do not force it to turn further.
Approx. 0.5mm open
factory setting with the
restrictor removed.
Fuel
Fuel Tank Side
approx 1mm
Deliver fuel to the carburetor High speed needle position when
starting the engine.
Needle
30º
Close the high speed
needle approximately
30° as needed. This
procedure will be repeated
several times throughout
the break-in process.
Idle Screw
High Speed Needle
Low Speed Needle
Open
Close
Close
Open
HIGH SPEED NEEDLE
LOW SPEED NEEDLE
More fuel
Less fuel
More fuel
Less fuel
Mid Needle
Carburetor Body
Slide Valve
Carburetor Body
Low Speed Needle
Rotate the low speed needle until the head
sticks out 0.5mm from the ball link body.
This is the standard position.
Ball Link
First rotate the mid needle until its slotted
head is flush with the carburetor body. This is the
standard position.
5.5 turns out. Make adjustments with the slide in the open position.
2¾ turns out. Make adjustments with the slide in the open position!
Dirt and dust may lodge in marked places
7
8
• With the engine running, close the throttle and allow it to idle for about five seconds
and then open the throttle to the full throttle position. If, at this point, the engine puffs out
excessive smoke and the vehicle does not accelerate smoothly and rapidly, it is likely that
the idle mixture is too rich. In this case, turn the low speed needle clockwise 45-90°. If the
engine speeds up momentarily and then cuts out abruptly when the throttle is opened, the
idle mixture is too lean. Correct this by turning the low speed needle counter clockwise 45-90°.
NOTE:
Low speed needle adjustments should be made in increments no more than
45-90°, carefully checking the effect on throttle response with each small adjustment.
• Carry out adjustments patiently under actual running conditions, until the engine responds
quickly and positively to the throttle inputs.
W A R N I N G !
Mixture adjustments (whether via the low speed needle, or the high speed needle),
cannot be made accurately under ‘no load’ conditions. These adjustments are not
recommended and carry’s the risk of seriously damaging the engine through over
revving and overheating.
• With the optimum mixture control position, light smoke is visible during high speed running
and the engine RPM increases steadily during acceleration. Remember, if the engine is
operated with a lean fuel/air mixture, it will overheat and run unevenly. It is advisable to set
both the high speed needle and low speed needle slightly on the rich side of the best RPM
setting as a safety measure.
• If the engine runs too fast with the throttle closed, the idle screw should be
turned counter-clockwise to reduce the throttle opening.
