ENGINE PARTS NAME
Battery Leads
Sensor Leads
High Tension Cord
Spark Plug
Carburetor
Complete 61HA
Sensor
Leads
RPM
Sensor
Drive Hub
Crankshaft
Heatsink Head
Propeller Nut
Ignition module (IG-05)
Cover
Plate
INSTALLATION OF THE ENGINE
CARBURETOR PARTS NAME
LINKAGE TO THE CARBURETOR
Fig.1
IGNITION MODULE
Major specifications
Consumption current is 750mA/14,000rpm/6.0V.
User a power source of more than 1500mAh
capacity.
The voltage of power source is 4.8~8.4V (rated).
(Ni-Cd, Ni-MH 4~6 cells, Li-Po, Li-Fe 2 cells)
Installation
Install the ignition module taking sufficient
anti-vibration measures.
Connect the sensor leads of the igniter module
(while, red, black three parallel wires) to the sensor
leads from the engine.
Connect the battery leads of the igniter module (red,
black two parallel wires) to the power source.
Install the module to the place where good ventilation is
secured because it becomes hot when the engine runs.
Hold the high tension cord to the frame to prevent
from breaking due to vibration.
Install the cooling fan and clutch on the engine, then
install the engine in the model referring to the
instruction manual supplied with the model.
At this time some small modifications are required
so that the carburetor parts may not interfere with
the cooling duct.
Select either F lever or J lever of
the Throttle Valve Lever supplied
according to the servo used.
Select a hole so that both servo
horn and Throttle Valve Lever make
right angle against the linkage rod.
Cut off the levers not in use with
nippers.
Cut off the levers
not in use.
This is a component for igniting a spark plug. Install
the plug cap on the plug by using force to push it to
the root. Then, install the module in the model.
Do not grip the engine mounting beams with a vise, or
the crankcase will be distorted which will result in
engine breaking. Do not use a tool which locks piston
when installing a cooling-fan and clutch, or top of the
piston may be damaged. Also, do not insert a screw
driver or the similar into the exhaust port.
NOTES ON INSTALLING COOLING FAN AND CLUTCH
Crankcase
Heatsink
Locking piston by inserting a tool from the
plug hole or exhaust port while installing
the cooling fan and clutch may damage
the engine.
When removing and installing the cover plate, be
sure to do it with the piston at TDC. Otherwise it
is possible the piston skirt will interfere with the
cover plate and become damaged.
71530510 and 71530520 cannot be used with the
GT15HZ600. If they are used, piston skirt will become
broken or damaged.
We strongly recommend to use Crankshaft Clamp
91/105/GT15 (Code No.71530530) available as an
optional tool.
The O.S. Crankshaft Clamp is a must-have for
installing the cooling fan!!
Regulator
Needle Valve
Mixture Control Valve
Throttle Lever
Fuel Inlet
NEVER disassemble the fuel pump or pressure
regulator. Their original performance may not be
restored after reassembly.
DO NOT allow foreign matter to enter the fuel
system. Dirt inside the pump or regulator, no matter
how small, may obstruct the flow of fuel and prevent
these components from working properly.
CARE OF FUEL PUMP & REGULATOR
DO NOT obstruct the small rectangular hole at the
bottom of the regulator, or the regulator will not
function correctly.
NEVER insert anything into the inlet or outlet nipples
in an attempt to clear a suspected obstruction.
ALWAYS use fuel filters. Keep the fuel tank
scrupulously clean and filter all fuel as it enters the
tank (e.g.via an O.S.'Super-Filter' Code No.72403050)
and use a good quality in-line filter between the tank
and pump. Remember to inspect filter screens at
regular intervals and rinse clean as necessary.
Rectangular
hole
NEVER use kerosene, thinner or any organic solvent
for cleansing the pump. Rubber parts will be ruined
by these materials. Use only alcohol (methanol) or
gasoline.
The Needle-Valve
For adjusting the mixture strength when the throttle is
fully open Needle-valve adjustment effect the mixture
strength at round mid speed.
The Mixture Control Valve
For adjusting the mixture strength at part-throttle and
idle speed, to obtain steady idling and smooth
acceleration to mid speed.
Two adjustable controls are provided on this
carburetor.
Therefore, it is required to adjust also the needle-valve
when the mixture control valve is adjusted. Mixture
control valve is pre-set at nearly best position when the
engine leaves the factory. Therefore, it is not necessary
to adjust the mixture control valve until running-in is
completed.
INITIAL OPENING OF THE NEEDLES
This carburetor is equipped with the following two needles.
The Needle-Valve
The default setting is made at the factory. This is to
adjust the fuel mixture from idling to hovering.
The Mixture Control Valve
Open it 2.5-3.0 turns from the fully closed position. This
is to adjust from hovering to the flight up in the air.
The initial opening is just a basic position and not
necessarily the optimum position.
Carry out adjustments according to the procedures
described in the NEEDLE ADJUSTMENTS section.
GT15HZ600 How to correctly fit the plug cap to the
spark plug
The GT15HZ600 gasoline engine is equipped with a
spark plug, and safe flight of the helicopter requires a
firm connection of the plug cap to the spark plug. See
the following instructions for details.
Cylinder head with spark plug
(Pic. 1)
Make sure that the spark plug is
tight in the head. Apply silicon
grease to the plug top or inside
of the plug cap for easy
connection. (Pic. 2)
(The shown cylinder head is a
cutaway.)
(Pic. 1)
(Pic. 2)
F
J
F
J
Fig.2
Plug Cap
Mount the PD-08 Pump Unit on the distant location
from the engine, where it can get good ventilation but
within the reach of the accessory tube. Mounting the
Pump Unit close to the engine cover plate may cause
malfunction of the Pump Unit due to high temperature.
Connect the nipple in the back of the Pump Unit to the
engine cover plate nipple with the Fluoro-rubber Tube
(included). The tube length should be around 10 cm.
Put a piece of tube around the end of the fuel tube as
shown in Fig 1 to prevent the tube from coming off.
MOUNTING THE PUMP UNIT
Fuel Tube (included)
Put a piece of tube around the Fuel Tube
to prevent the fuel tube from coming off.
Carry out the linkage making sure of the moving
direction of the throttle valve. The moving angle of the
throttle valve from fully closed position to fully opened
position is 85 degrees. Connect the throttle linkage so
that the engine can be completely stopped via radio
operation. The throttle opening when starting should
be approx. 30 % of the total movement. After starting
the engine, you can set the idling position lower as the
engine is warming up. We recommend you to set a
specified starting mode in a vacant idle-up channel for
example idle-up 3, so that you can use the mode until
the engine warms up.
F
J
J
F
28
34
27
33
Notice on 61HA carburetor clogging
Gasoline engine carburetors generally have
narrower fuel passages for better fuel mileage than
glow engines. As a result, the passages clog easily if
a fuel filter is not used. You should insert a
gasoline-resistant fuel filter — finer than #200
mesh — between the fuel tank and the engine (if a
T-shaped tank nipple is used, place the filter between
the nipple and the engine).
When filling your fuel tank from a gasoline container,
always use the O.S. Super Filter L (part #72403050)
to prevent dust from entering the tank. A clogged
carburetor can cause inconsistent running, stalling,
and overheating. If your carburetor becomes
clogged, it must be disassembled and cleaned.
When taking apart the carburetor, remember the
assembling order. Be careful not to lose small
internal parts. If you’ re not confident performing
this type of maintenance, take the engine to the
hobby shop where you purchased it or send it to the
service center of your country’ s O.S. distributor.
