O.S. Engines 91HZ-R 3C - Manual (Page 12)

22
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
23
ABOUT THE PLUMBING
Carry out plumbing referring to a sketch on page 24.
Connect silicone tubing cut into approx. 10cm to the
nipple on the cover plate.
Then, connect the check valve supplied with the
engine as sketched (Be aware of the direction.) It is
suggested to install a stopper as shown in the sketch.
When refueling, remove this stopper to release
pressure in the fuel tank.
Connect the fuel line to the nipple on the regulator.
Be sure to equip a commercially available in-line filter
to avoid dust entering the regulator.
Note:
Since the muffler pressurized fuel feed is not used
with this engine, plug a nipple on the muffler or
replace it with a bolt.