O.S. Engines 91HZ-R 3D - Manual (Page 14)

26
Open
1.
2.
Opening and closing of the Needle-Valve
Turn the needle clockwise to close the needle-
valve, and turn the needle counter-clockwise to
open the needle-valve as shown in the sketch.
High Speed needle-valve:
approx. two half turns open from the fully closed
position. (
Note: If a different muffler is used, this
setting may require readjustment)
Idle Mixture Control Screw:
at basic position when the engine leaves the
factory.
one turn open from the fully closed position.
Medium Speed needle-valve:
Close
4. Checking the rotating direction of the starter
Make sure that the starter rotates
to the direction shown in the
sketch. If the direction is reverse,
reverse the leads on battery.
3. Preparation of the starter
Install the starting shaft to the
starter securely.
Improper installation will allow the
shaft to swing creating a
dangerous situation.
High Speed
needle-valve
Idle Mixture Control Screw:
Medium Speed needle-valve:
27
5. Inserting the starter shaft
Insert the starting shaft into the
shaft cup securely.
6. Priming
Check the movement of all the controls after
switching on both the transmitter and the receiver.
Then, fully open the throttle valve without heating
the plug. Turn the engine with an electric starter
until the fuel comes into the carburetor inlet.
Stopping the engine
Fully pull down the throttle trim on the transmitter.
Starting
Connect the battery to the glowplug and start the
engine by applying the starter. When started, switch
off the starter and withdraw the starting shaft after
making sure the rotation of the starter shaft stops.
Preparation of starting 7.
8.
9.
Hold the rotor head by hand so that rotor cannot
rotate when the engine is Started. Also, steady the
model with a foot on the landing gear skid.
Make sure that the transmitter
throttle stick is at the fully closed
position and the throttle trim at
center position, and make sure
that idle-up switch on the
transmitter is off.