4
open, a great thrusting force is produced, which is very dangerous).
• Be sure to wear a thick glove when flipping the propeller. Use all fingers, except thumb,
for the flipping operation.
How to Stop the Engine
For stopping the engine, the black lead wire
from the coil should be grounded to the
engine body, or the throttle valve should be
closed completely.
The carburetor is provided with 3 adjust screws which are set to the best (approximately)
positions by our company, but they may need a little adjustment depending on the
temperature, atmospheric pressure (altitude), etc. of the area where the engine is used. Start
the engine without making any adjustments. Make readjustments only when the engine
shows any mal-functioning.
[ NOTE ]
Be sure to stop the engine before starting the adjustment, thus ensuring safety.
Idle Screw:
Turning this screw clockwise increases the idling R.P.M. Turning it
counterclockwise decreases the idling R.P.M.
Low Speed Needle:
This is the fuel adjust screw (not the air screw). Turning this needle
clockwise makes the mixture gas leaner and turning it counterclockwise
makes it richer.
High Speed Needle:
Turning this needle clockwise makes the mixture gas leaner and
turning it counterclockwise richer. Set this needle at a position which is 1/4
open from the maximum R.P.M. position while the airplane is on ground.
[ NOTE ]
1. Do not tighten the High and Low Speed needles too firmly.
2. When the unit has just started and the engine is not warm enough, there may be
insufficient acceleration and the engine may be stopped. Be sure to perform idling before
operation.
No specific break-in is required. The engine is gradually getting break-in as it is used and the
output is also increased gradually.
This engine is used for power source for radio controlled airplane so you are strictly
requested to check engine and relative parts of airplane.
8. Maintenance
7. Engine Break-in
6. Carburetor Adjustment
KILL
SWITCH
BLACK
LEAD
RED LEAD
ENGINE BODY EARTH
Low Speed
Needle
High Speed
Needle
Idle Screw
Standard Opening Position :
LOW SPEED NEEDLE : 1
1
/
2
±
1
/
4
HIGH SPEED NEEDLE : 1
1
/
4
±
1
/
4
