O.S. Engines 50SX-H - Manual (Page 14)

STARTING
Close
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.
3.
77
°
As shown in the sketch, the carburetor has
graduation marks. When the triangle mark on the
carburetor rotor meets the far right mark, the throttle
is fully closed. When the triangle mark meets the top
mark, the throttle is fully open. The range is 77
degrees. You may use the other three marks as the
reference marking of throttle opening to your
preference when hovering.
WARNING!
Never try to check the triangle mark position
while the engine is running and rotor is
rotating, or you may be hit by rotating rotor which
results in serious injury. Stop the engine and
rotor before checking the triangle mark position.
Graduations on the carburetor body
Carburetor Rotor
Carburetor Body
Fully closed position
Fully opened position
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.
Opening the needle-valve
Firstly, turn the needle clockwise slowly until it
stops. The position it stops is the fully closed
position of the needle-valve. Make note this
position for reference..
Open the needle-valve 2 turns.
Preparation of the starter
Install the starting shaft to the
starter securely. Poor installation
swings the starting shaft, which is
dangerous.
13