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8. Carburetor Adjustment
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-running.
High Speed needle
Fig.8
Standard opening of each needle as follows;
Idle Screw:
Turning this screw clockwise increases the idling R.P.M.
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.
Set this needle at a position which is 1/4 open from best mixture (maximum R.P.M.)
position.
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 1/8~1/4 open from the
maximum R.P.M. position while the airplane is on ground.
CAUTION
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.
Low Speed needle
H
3
1
1
/
±
/
1
8
4
Idle Screw
L
3
1
/
±
/
8
4
Turning it
7
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