(72148000)
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NEEDLE ADJUSTMENTS
O.S. GENUINE PARTS & ACCESSORIES
(72403050)
(71531010)
(L)
NON-BUBBLE WEIGHT
(S)
(72403051)
SUPER FILTER
(S)
STARTING
MAINTENANCE AFTER THE DAY’S FLIGHTS
Fill the tank with mixed gasoline.
Turn the transmitter switch ON and check the
movement of each servo.
Turn off the ignition switch, and open the throttle
fully.
Apply an electric starter for several seconds. Note
that the correct rotating direction of the starter is
counter-clockwise facing the engine.
Make sure the fuel has reached the carburetor.
Make sure the throttle opening is set at the idling
position approx. 30 % of the fully opened position.
Turn on the ignition switch, then apply the starter.
Start the engine with the following procedure.
If the idling is stable, advance the throttle stick
gradually to take off. If the take-off is done normally,
there is no problem. If there is a problem, carry out
adjustments according to the symptoms.
Carry out the needle settings as follows.
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Generally a gasoline engine is more sensitive to a lean
mixture in comparison to a glow engine and will
over-heat and stop without warning. The engine should
always be run with a slightly rich mixture setting.
After confirming stable hovering, start the running-in
consuming 2~3 litters of fuel. Carry out the
running-in taking time and checking the remaining
level of the receiver battery due to much lower fuel
consumption with a gasoline engine. Running
temperature of a gasoline engine even with a
normal running comes to around 130℃. Never
touch the engine nor silencer, or you will get a
serious burn.
Fill the carburetor with fuel at the conclusion of a
day’s flying. (Pay careful attention to fire and ignition
source when carrying and storing the model.)
If the engine is stored without filling the carburetor
with fuel, inside parts will dry out and not work
properly at the next running. If the engine quits out
of fuel, refill the carburetor with fuel.
With a gasoline engine rust hardly occurs. Check
the exterior to make sure there is nothing wrong and
wipe off any oil residue.
Use gasoline to clean the outside of the carburetor.
Do not use kerosene ,or the inside parts will be
damaged. Clean the outside only because the
inside parts are sensitive to foreign matter.
After cleaning the engine, dry it well then inject a
small quantity of oil used to mix fuel and rotate the
crankshaft several times to distribute the oil well
inside the engine.
Store the batteries for the ignition and the receiver
removing from the model. In case of Li-Po
batteries, utmost care should be taken not to get
fired accidentally.
(71530530)
CRANKSHAFT CLAMP 91/105/GT15
Halfway Connection 2 (Pic. 6)
The plug cap is not fitting on the
spark plug hexagon base
completely.
How to remove the plug cap
(Pic. 7)
Hold the plug cap body tight by
wrapping with waste cloth and
pull it straight. Do not pull the
cable alone or it may cause the
wire to break internally.
(Pic. 6)
(Pic. 7)
Fig.3
FUEL
FUEL TANK & LINES
Be sure to equip
air vent pipe.
Be sure to use fuel line keepers to
prevent tubing from coming off.
To carburetor
fuel inlet
Be sure to replace tubing
inside periodically.
Gasoline is highly flammable. Carry out the mixing
of the gasoline and oil outdoors or in a well
ventilated place away from any source of fire to
prevent the possibility of a fire.
With a gasoline engine, passages in the carburetor
are narrower than that of a glow engine, and therefore
very sensitive against foreign matter such as dust. It is
suggested to use optional accessory Super Filter L
(Code No. 72403050)when filling a tank in the model
from a container used for transportation or storing.
Use a tank designed for gasoline. (Tanks designed
for glow fuel use a rubber cap which is deteriorated
by gasoline.)
For tubing inside the tank use fluoro-rubber or nitrile
rubber of 2.0mm ID. Replace tubing inside the fuel
tank every six month. Since the model attitude
changes vigorously, flexible tube and heavy enough
weight are required. It is suggested to use optional
accessory Non-Bubble Weight (Code No. 71531010)
for it.
This engine does not require a muffler pressurized
fuel system but be sure to provide an air vent.
Be sure to use the tube
resistant to gasoline.
Use regular gasoline. No need to use high octane
gasoline. Mix commercially available 2 stroke engine
oil with a 25:1 ratio.
We have checked and recommend the following oils.
Zenoah Genuine FC Class
KLOTZ ModeLube®
AMSOIL Saber
With these oils, you can set the needles without
changing the factory settings too much.
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(28382100)
ID. 2mm × OD. 4mm Length 500mm
(28382200)
ID. 3mm × OD. 5mm Length 500mm
POWER BOOST PIPE GT15HZ
FLUORORUBBER TUBE
SPARK PLUG CM-6(NGK) (71669000)
Use a fuel tank designed for gasoline engines.
Tanks designed for glow fuel use a rubber cap, which is
easily deteriorated by gasoline. For tubing inside the tank,
we recommend 2.0 mm I.D. fluoro-rubber tube (code
no.28382100). Replace tubing inside the fuel tank every
six months. Since the model attitude changes vigorously,
flexible tube and heavy enough weight are required. It is
suggested to use optional accessory Non-Bubble Weight
(code no.71531010) for it. This engine does not require a
muffler pressurized fuel system but be sure to provide an
air vent as shown in Fig.3.
PIPINGS
Connect the fuel lines with fuel tubes. From the fuel tank
outlet to the Pump Unit inlet, and also from the Pump
Unit outlet to the carburetor inlet, We recommend to use
TYGON tube, in which the fuel is visible.
Radio‘noise’ generated by partial connection may cause
errors in receivers, gyros, governors and servos.
Again, the plug cap may detach during flight.
After starting the engine, make sure the clutch is
disengaged and the main rotor is not rotating since
the throttle opening at idling position is around 30 %.
When the idling becomes stable, bring the model to
a safety place for warming up and continue
warming up for 2 minutes. During the warming up,
the rotor will rotate slowly but it will be no problem.
After the warming up, switch the start position mode
to the normal hovering mode, then adjust the
opening of throttle precisely.
A) If the engine responds sluggishly to increase
rpm, turn the slow needle 5 degrees clockwise and
try a takeoff again. Repeat the same procedure until
you find the fine adjustment.
B) If the engine runs at very high rpm, or hesitates
before picking up speed and stops, turn the mixture
control valve 10 degrees counter-clockwise.
Repeat the same procedure until you find a fine
adjustment.
After breaking-in, switch the flight mode and start the
flight in the air. If the engine quits or over-revs at full
throttle with small pitch angle, you need to set the
needle richer. Turn the needle valve 45 degrees
counter-clockwise. Re-adjust the idle-up throttle
curve flat and lower. In the rich needle setting, the
engine responds sluggishly to increase rpm. Turn the
main needle 2-3 clicks clockwise and see the
change.
Correct connection (Pic. 3)
The ‘tight fit’ plug cap is
designed not to detach from the
spark plug easily. Press the plug
cap firmly until it covers the
hexagon plug base with a ‘click’.
The fully connected plug cap in
the cylinder head doesn’t show
the stamped “O.S.” logo on its
side. (Pic. 4)
(Pic. 3)
(Pic. 4)
Halfway Connection 1 (Pic. 5)
A spark between the plug cap
and the plug generates radio
‘noise’, which may cause errors in
receivers, gyros, governors and
servos. The plug cap could also
detach during flight. (The shown
cylinder head is a cutaway.)
(Pic. 5)
