GB–22
5.
With drive assembly 1/8” from contacting roll
pin, tighten flange nuts securing speed selector
plate.
6.
Shift speed selector to R (REVERSE) and back
to third to check adjustment. If space between
roll pin and drive assembly is more than
#
/
16
of
an inch (4.8 mm), repeat steps 2–4.
7.
Reassemble bottom cover with (4) screws.
Adjusting Carburetor
The carburetor has been adjusted at the factory, but an
occasional adjustment may be required.
1.
Remove (3) screws, (3) lock washers, and (3)
washers securing muffler guard to engine
(Fig. 16). Remove muffler guard.
2.
Remove (3) Phillips screws and (1) hex head
screw securing heater box in place (Fig. 16). Pull
choke knob off choke rod (Fig. 15).
3.
Lift heater box up and away from the engine,
and reinstall choke knob on mounting pin.
Note:
Skip steps 4 and 5 if the engine will
start and run.
4.
Power Adjusting Screw (Fig. 29)—Close screw
by gently rotating it clockwise until a slight
seating resistance is felt. Next, rotate power
adjusting screw one full
turn—360
_
—counterclockwise.
IMPORTANT: Do not close power adjusting
screw or idle mixture screw too tight because
the screw and seat will likely be damaged.
5.
Idle Mixture Screw (Fig. 29)—Close screw by
gently rotating it clockwise until a slight seating
resistance is felt. Next, rotate idle mixture screw
1–1/2 full turns counterclockwise.
6.
Start engine and let it warm up for
approximately 3 to 5 minutes; then move throttle
to FAST.
POTENTIAL HAZARD
•
Engine must be running so final
adjustment of the carburetor can be
performed.
WHAT CAN HAPPEN
•
When snowthrower is in operation,
impeller and auger can be rotating.
HOW TO AVOID THE HAZARD
•
Move auger/impeller drive and traction
drive controls to DISENGAGE.
•
Keep hands, feet, face, and other parts of
your body or clothing away from muffler,
auger/impeller, discharge chute, and any
moving part(s).
POTENTIAL HAZARD
•
Engine exhaust contains carbon monoxide.
WHAT CAN HAPPEN
•
Carbon monoxide is an odorless, deadly
poison.
HOW TO AVOID THE HAZARD
•
Do not run engine indoors or in an enclosed
area.
7.
Rotate power adjusting screw (Fig. 29)
clockwise—in—1/8 turn at a time until engine
misses because of a lean gasoline mixture. Then
rotate screw counterclockwise—out—1/8 turn at
time until engine runs unevenly because of a rich
gasoline mixture. Next, rotate power adjusting
screw clockwise, back to the midpoint between
the rich and lean settings, so engine runs
smoothly.
Note:
Wait several seconds between each 1/8
turn setting so engine can adjust to the
new fuel mixture.
8.
Move throttle to idle speed. Next, rotate idle
speed screw until engine idles fast—1750 rpm.
