Ryobi 330B - Manual (Page 17)

MAINTENANCE AND REPAIR INSTRUCTIONS
17
REPLACING THE SPARK PLUG
Use a Champion RDJ7Y spark plug (or equivalent).
The correct air gap is 0.020 inch (0.5 mm.). Remove the
plug after every 50 hours of operation and check its
condition.
1. Stop the engine and allow it to cool. Grasp the plug
wire firmly and pull it from the spark plug.
2. Clean around the spark plug. Remove the spark plug
from the cylinder head by turning a 5/8 in. socket
counterclockwise.
3. Replace cracked, fouled or dirty spark plug. Set the
air gap at 0.020 in. (0.5 mm.) using a feeler gauge
(Fig. 22).
CAUTION: Do not sand blast, scrape, or
clean electrodes. Grit in the engine could
damage the cylinder.
4. Install a correctly gapped spark plug in the cylinder
head. Tighten by turning the 5/8 in. socket clockwise
until snug.
If using a torque wrench torque to;
110-120 in.•lb. (12.3-13.5 N•m).
Do not over tighten.
ACCESSORIES/REPLACEMENT PARTS
2-Cycle Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147543
Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610311
Vacuum Tube Assembly . . . . . . . . . . . . . . . . . . . 182480
Vacuum Bag Assembly . . . . . . . . . . . . . . . . . . . . 182476
Vacuum Accessory Kit . . . . . . . . . . . . . . . . . . . . 300031
Blower Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182478
Fuel Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180000
Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182500
0.020 in.
(0.5 mm.)
Fig. 22
CLEARING A BLOCKED IMPELLER
WARNING: During normal operation, parts
of this unit become hot. Wear protective
clothing and observe all safety instructions
to prevent serious personal injury.
1. Shut off the unit and wait for the engine to come to a
complete stop.
2. Remove the vacuum tubes. See Assembling Unit as
a Vacuum. The vacuum bag can also be removed for
easier handling of the unit.
3. Carefully remove material blocking the impeller.
Inspect the blades to assure no damage has
occurred. Rotate the blades by hand to assure the
blockage is completely cleared.
4. Replace the vacuum bag and vacuum tubes.
5. Restart unit and resume use.