5
Mounting the Engine
Make sure the engine is mounted on the aircraft using
aircraft grade plywood that’s at least 6mm in thickness
for the G26 engine, and 10mm in thickness for the G38
through GT80 twin, or a mount of equivalent strength.
Make sure it’s firmly mounted with 4 bolts.
1. Be sure to set flat washers or a metal plate on the
reverse side of the mount to prevent the bolts from
sinking into the mount. Periodically check the engine
mount for loose bolts.
2. Since the engine is equipped with a floatless carburetor
with a diaphragm pump, the direction of the cylinder and
position of the fuel tank can be freely selected.
3. If the engine is mounted on a shock (rubber) mount
placed between the engine and the firewall for anti-
vibration, check the hardness of the rubber, making sure
it’s not too soft, in order to avoid excessive vibration
during engine operating rpms. Note carefully if the engine
is vibrating at idle, as excessive vibration can result in
erratic engine operation due to overflow at the carburetor.
4. It is suggested that the bolts for the muffler be coated
with threadlock when mounting the muffler to the engine.
Break In
No specific break in is required. The engine is gradually
broken in as it is used, and the output power increases
gradually as the engine breaks in.
Starting the Engine—Aircraft
Before attempting to start the engine, be sure to read through
all the steps for starting the engine as outlined below:
Zenoah engines are equipped with the ultra compact
C.D.I. type flywheel magneto ignition system and should
be started according to the following procedure:
Note: The magneto system is timed in such a way
that when the compression stroke starts (refer
to Figure 1-A) sparks are never produced on the
spark plug, no matter how fast the propeller is
flipped. The correct starting procedure is to quickly
flip the propeller when the edge of the magnet on
the rotor is approaching the coil (Figure 1-B). This
means that the propeller should be quickly flipped
at about 90 degrees in crank angle before the com-
pression stroke is about to start.
1. Make sure the spark (glow) plug(s) are installed and
tightened. Check the condition of the plug cap for cracks
or breaks.
2. Be sure the propeller is properly secured.
3. Make sure the fuel tank line(s) are properly connected.
The main line should be connected to the carburetor
spray bar.
4. Be certain the mufflers are installed properly.
5. Fill the fuel tank.
6. Choke the engine and turn the propeller through a
few times until the fuel appears at the carburetor.
7. Set the throttle valve at the idle position or at the
position slightly open from idle.
Fig 1-A
Coil
Magnet
Fig 1-B
Operation
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