O.S. Engines 91SZ-H PS Hyper - Manual (Page 12)

22
Silencer
Fuel tank
Pump
Fuel Stopper
(commercially available)
Fuel Filter
(commercially available)
When an engine r.p.m. control equipment (generally called as
Governor) is used, it is expected that the engine runs stably
without employing the silencer pressurized system because
the engine r.p.m. will not exceed the setting r.p.m. In this
case, carry out piping as illustrated. Be sure to use a check
valve to prevent the fuel coming out during inverted flight.
Also, it is expected to open the needle a little more than
Piping 1. In either case, carry out running-in referring to
STARTING section.
Piping 2
Check valve
(commercially available)
23
STARTING
Open
Be sure to use a muffler pressurized fuel feed. Use
the same fuel as you intend to employ for actual
operation of your model.
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:
exactly 2 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.
exactly 1 turn open from the fully closed position.
Medium Speed needle-valve:
Close
4.
5.
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.
Inserting the starter shaft
Insert the starting shaft into the
shaft cup securely.
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.
2
1
2 1