Service Manual
2.
Idle
speed
Adjustments
WARNING
Too high
a
speed
settlng can cause
severe personal injury
or
death-
Follow the
manufacturer’s speclfications for
low
and high
idle speeds as found in the equlpment Owner’s
Manual. Use an accurate tachometer
High Idle
Speed
Adjustment;
Refer to Figure
9-6.
1.
Set up the tachometer according to the instruc-
2.
Start the engine according to the equipment
manufacturer’s recommendations, observing
all safety precautions, and allow the engine to
warm up for at least
10
minutes.
3.
While the engine
is
running move the throttle
controi lever to align the
lock
pin holes in the
control plate and throttle control lever and in-
sert a pin to lock the lever in place. Loosen the
speed control cable clamp
if
necessary.
4. Loosen the choke rod clamp screw and push
the choke rod towards the carburetor
so
that
the choke will be fully open.
5.
High idle speed is adjusted by rotating the con-
trol plate around the pivot bolt-away from the
carburetor to increase speed and toward the
carburetor to decrease speed. Therefore,
loos-
en the control plate pivot
bolt
1/8
turn and the
the control plate set
bolt
1/4
turn. Adjust high
idle
speed
to that specified by the equipment
manufacturer, tighten the control plate bolts,
recheck speed and readjust
if
necessary.
6.
Remove the lock pin to release the throttle con-
trol lever.
tions with the tachometer.
bow
Idle
Speed
Adjustment;
Refer to Figure
9-7.
1.
Continue running the engine with
the
tachome-
ter connected and move
the
throttle
control
le-
ver to the
low
idle speed position.
2.
Adjust engine speed
to
the specified low idle
speed by’
turning
the
low idle speed screw on
the carburetor. See Figure
9-1, 9-2
or 9-4, .as
appropriate. Shut
off
the engine and proceed to
the choke adjustment.
SPEED
CONTROL
CABLE
CLAMP
9/64
IN.
(3.5
mm
LOCK
PIN
HOLE
CONTROL
CONTROL
PLATE
PIVOT
PLATE
BOLT
FIGURE
9-6.
HIGH
IDLE SPEED ADJUSTMENT
-LOW
IDLE
SPEED
.POSITION
OF
ME
THROTTLE
CONTROL
LEVER