Manual

Air Filter
m
o
®
Fig. 18
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TO REPLACE SPARK PLUG
Use a Champion DJ7Y spark plug (or equivalent).
Correct air gap is 0.020 in. (0.50 mm). Remove plug
after every 50 hours of operation and check its condition
(Fig. 22).
1. Stop the engine and remove the air filter cover. See
Air Filter Maintenance.
2. Pull the wire off of the spark plug.
3. Clean around the spark plug and remove it from the
cylinder head.
NOTE: Replace a cracked, fouled or dirty spark plug. Do
not sand blast, scrape or clean electrodes because the
engine could be damaged by grit entering the cylinder.
.
Set the air gap at 0.020 in. (0.50 mm) using a wire
feeler gauge (Fig. 22). Install a correctly gapped
spark plug into the cylinder head. Torque to
110-120 inolb (12.3-13.5 N°m).
Fig. 19 0.020 in.
(0,50 mm)
Fig. 22
CLEARING A BLOCKED IMPELLER
A
WARNING: During normal operation, parts of
this unit become hot. Wear protective clothing
and observe all safety instructions to prevent
serious personal injury.
Fig. 20
Fig. 21
1,
2.
3.
4,
5.
6.
Shut off the unit and wait for the engine to come to a
complete stop. Disconnect the spark plug wire to
prevent the unit from starting.
Remove the vacuum tubes. See Assembling Unit
as a Vacuum. The vacuum bag can also be removed
for easier handling of the unit.
Carefully remove material blockingthe impeller.
Inspect the blades to assure no damage has
occurred. Rotate the blades by hand to assure the
blockage is completely cleared.
Reconnect the spark plug wire.
Replace the vacuum bag and vacuum tubes.
Restart unit and resume use.
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