User Manual

26 Hangar 9 Taylorcraft 26cc BNF
Engine Operation
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 the propeller should
be quickly flipped at about 90 degrees in crank angle
before the compression stroke is about to start.
Coil
Magnet
Fig 1-A Fig 1-B
1. Make sure the spark (glow) plug(s) is 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) is 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. Move the ignition kill switch to the “off position” prior to
choking the engine.
7. Choke the engine and turn the propeller through a few
times until the fuel appears at the carburetor.
8. Set the throttle valve at the idle position or at the
position slightly open from idle.
9. Quickly flip the propeller in a counterclockwise direction.
(See note on previous page).
10.
The engine should start after a few flips of the propeller.
11. Be sure to open the choke when the initial firing of the
engine is heard.
12. When the choke is opened, be sure to close the throttle
valve to a position near the idle position before the next
flipping of the propeller is attempted.
CAUTION: If the engine is started when the
throttle is wide open, a great thrusting force will be
generated, which could cause injury.
13. If you do not use a chicken stick to start the engine,
be sure to wear a thick glove when flipping the
propeller and use all fingers, except the thumb, for
the flipping operation.
14. Do not over-rev the engine. These engines are designed
to develop maximum output with the standard muffler
and the recommended propeller size. Please refer to
the propeller chart on page 10 to confirm the proper
propeller for the applicable Zenoah engine.
Stopping the Engine
The ability to shut down the engine in an emergency is
extremely important. For stopping the engine, use the kill
switch located on the side of the fuselage as shown in the
engine installation section of this manual.
The Zenoah ZEN20000 Kill Switch has been preinstalled
for your model. The following example shows how the kill
switch is wired for your particular model.
Kill Switch
Black Lead
Engine
Body
Ground
Carburetor Adjustment
The carburetor is provided with three adjustment screws,
which are factory set to the best (approximate) positions.
They may need minor adjustment, depending upon the
temperature, humidity, atmospheric pressure (altitude), etc.,
of the area where the engine is being used.
High-Speed Needle
Idle Screw
Low-Speed Needle