6.
CARBURETOR ADJUSTMENT
The carburetor is carefuuly adjusted in the factory before shipment. Never attempt to adjust it except when
necessary.
1) Idling Adjustment (See Fig.
20.)
Move the governor lever to the lowest speed posi-
tion
(so
that the carburetor throttle valve fully
closes), and check that the engine idles quiet and
smooth. This is the ideal idling condition. Nor-
mally, the engine is set to an idling speed of 1600
k
100
rpm, for which the following two methods
may be used.
a) Low-speed stopper screw
Engine speed increases if the low-speed stop-
per screw
on
the carburetor is turned clock-
wise, or decreases if it is turned counterclock-
wise.
b)
Pilot screw (Do not turn it except
when necessary.)
When the pilot screw
is
turned clockwise,
the fuel-air mixture decreases and the engine
slows down. If the pilot screw is turned coun-
terclockwise, the fuel-air mixture increases
to raise engine speed. The normal position
of
the pilot screw
is
one turn and a quarter back
from the clockwise extremity.
2)
Maximum Speed Adjustment (See Fig.
2
1.)
The standard maximum speed
is
5000
rpm for
EC06,
or
5500
rpm for EC08.
Move the governor lever to the highest speed
position, adjust the crankshaft rpm to
5000
(EC06) or
5500
(EC08) with the high-speed
stopper bolt, and lock the bolt with the nut.
Fig.
20
Governor
Lever
Low Speed
n
I
Fig.
21
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14
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