O.S. Engines 91HZ-R 3C - Manual (Page 11)

20
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.
21
INSTALLATION OF THE CARBURETOR
1.
2.
Retainer screw
Carburetor Rubber
Gasket
0.2mm gap
Carburetor Rubber
Gasket
Insert the carburetor rubber
gasket on the carburetor
body securely.
Then, insert the carburetor
in the crankcase.
Note: In case it is hard to insert the carburetor in
the crankcase, apply oil on the Thermo Insulater.
Do not force it, or damage to the Thermo Insulater
and/or crankcase can occur.
Rotate the retainer screw gently until it stops, then
tighten a further 90-120 degrees.
Do not over-tighten the screw as this will damage
the Thermo Insulater. 3.
Loosen carburetor retainer screw slightly.
Retainer screw
As delivered, the engine has its carburetor lightly
fitted into its intake boss. Secure it as follows.