O.S. Engines 91HZ-R 3D - Manual (Page 10)

18
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.
19
CARE OF REGURETOR
NEVER disassemble the pressure regulator.
Their original performance may not be restored
after reassembly.
NEVER insert anything into the inlet nipple in an
attempt to clear a suspected obstruction.
ALWAYS use fuel filters.
Keep the fuel tank scrupulously clean and filter all
fuel as it enters the tank (e.g.via an O.S.'Super-
Filter' Code No.72403050) and use a good quality
in-line filter between the tank and regulator.
Remember to inspect filter screens at regular
intervals and rinse clean as necessary.
DO NOT clean the regulator with organic solvent
such as kerosene, light machine oil, gasoline,
thinner or crc as the silicone rubber parts inside
will deteriorate. Be sure to use methanol or fuel.
DO NOT allow fuel to remain in the regulator.
After finishing the day's flight session, be sure to run
out the fuel in the regulator. Stop the fuel flow to the
regulator with a stopper and run the engine at idle to
use up the fuel in the regulator. After stopping the
engine, rotate the engine by electric starter to
eliminate fuel inside the engine.
DO NOT allow foreign matter to enter the fuel
system. Dirt inside the regulator, no matter how
small, may obstruct the flow of fuel and prevent a
from working properly.
DO NOT block the five holes on the top of the
regulator, or the regulator may not work properly.
Do not insert a needle or anything into these holes.
ABOUT THE REGURETOR
Five holes