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Maintenance Instructions ADJUSTMENTS
78
Carburetor Adjustment
3. Start the engine and allow it to warm up by run-
ning at 1/2 throttle for approximately five (5)
minutes. The engine must be warm before
making final settings.
4. Move the throttle to the idle position. Adjust idle
speed for 1200 rpm (± 75 rpm) by adjusting the
idle speed screw. Check the idle speed using a
tachometer.
5. With the engine idling, adjust the idle mixture by
turning the idle mixture needle valve in (slowly)
from the preliminary setting until engine speed
decreases and then back out approximately 3/4
to 1 turn to obtain the best low speed perfor-
mance.
6. Recheck idle speed after the final idle mixture
adjustment.
GHS “Full” Signal Horn with Grass-Pak
®
Switch
If the GHS “full” signal horn is not sounding when the
catcher is full, the following troubleshooting instruc-
tions apply:
Troubleshooting (When Horn Fails to Operate)
1. Check the horn.
a. Disconnect the two wires from the Grass-
Pak
®
switch electric connector plug and
make a jumper wire connection between
these wires (bypassing switch).
b. Turn the ignition switch ON and move the
blade clutch to the ENGAGED position
(engine not running) to make the horn
sound.
c. If the horn does not sound, the horn is bad
and needs to be replaced.
d. If the horn does sound, proceed to step 2.
2. Check the Grass-Pak
®
switch.
a. Reconnect the wires to the Grass-Pak
®
switch electric connector plug.
b. Turn the ignition switch ON and move the
blade clutch to the ENGAGED position
(engine not running).
c. Open the catcher back door and trigger the
Grass-Pak
®
vane by hand as it oscillates.
d. The horn should sound as the switch is
moved in both directions. If the horn does
not sound, the switch is bad and needs to
be replaced.
DANGER
The engine must be running to adjust the
carburetor for engine idle. To guard
against injury, keep hands, feet, face, and
other parts of body away from the muffler/
exhaust pipe, other hot parts of the engine,
and moving or rotating parts of the engine.
Low Idle Mixture
Needle Valve
(May be Non-Adjustable)
Fixed Main Jet Under
Shutdown Solenoid
Idle Speed
Screw
WARNING
DO NOT test the Grass-Pak
®
switch with
the engine running. Projectiles CAN be
thrown out of the grass delivery spout and
CAN cause serious injury to bystanders or
property damage.