O.S. Engines 91HZ-R 3C - Manual (Page 15)

28
STARTING
Be sure to use an electric starter to start
the engine.
Fill the fuel tank with fuel. When filled, prevent the
fuel from flowing into the carburetor with a
commercially available fuel stopper, etc. Release
the stopper before starting the engine. 1.
2.
Starting procedure is as follows:
WARNING
When checking the plug element hold the plug
with tools, such as pliers, etc.
Do not hold near your face or the fuel remaining
in the filament may burn you.
Glow Plug Igniter
Pliers
Element glows when energized.
Replace the plug when the
element does not glow or is
burnt out.
Make sure that plug element glows red, and install
the plug in the cylinder head.
Never fail to check the tightness of screws
and nuts, especially engine mounting and
moving parts (e.g. throttle lever).
29
Open
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:
approx. two half 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.
one turn open from the fully closed position.
Medium Speed needle-valve:
Close
4. 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.
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.
High Speed
needle-valve
Idle Mixture Control Screw:
Medium Speed needle-valve: