O.S. Engines 91HZ - Manual (Page 11)

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1.
2.
3.
Connect the Needle control Arm lever and servo
horn with the linkage rod. Set the linkage so that
the Needle control Arm lever and servo horn
makes right angle at the center of servo stroke. 3.
approx.
14-16mm
The throw angle of the servo horn should not be
more than 45 degrees both right and left. Use a
hole approx.15mm from the center of the servo
horn.
Servo
Servo Horn
Linkage Rod (commercially available)
Equal distance
Close the high speed needle slowly to fully closed
position. Then, open the high speed needle two
turns and remember it’s position.
Switch on the transmitter and then receiver. Check
all the movements. Confirm moving direction of the
servo vs. transmitter stick travel volume direction.
Move the transmitter stick travel volume fully in the
direction which opens the high speed needle.
Connect the linkage rod, and install the control arm
on the high speed needle.
ADJUSTMENT
45 degrees 45 degrees
21
5.
6.
4.
WARNING:
Lean running affects the engine performance very
much. Always try to run the engine at slightly rich
setting.
Close the high speed needle by moving the
transmitter stick travel while actually flying the
model.
It is suggested for safety to carry out this
adjustment after landing the model specially when
you are not accustomed with it’s operation.
If the engine runs rich even if the transmitter stick
travel is moved fully in the direction the high speed
needle closes, stop the engine and remove the
control arm from the high speed needle.
Remember the opening of the high speed needle at
this time.
Repeat procedure 3.