Ryobi 770rEB Manuel d'utilisateur Page 22

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MAINTENANCE AND REPAIR INSTRUCTIONS
22
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. 39).
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 Nm).
Do not over tighten.
ACCESSORIES/REPLACEMENT PARTS
2-Cycle Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147543
Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610311
Replacement Line . . . . . . . . . . . . . . . . . . . . . . . 610375
Replacement Line Cartridge . . . . . . . . . . . . . . . . 153577
Inner Reel Spring . . . . . . . . . . . . . . . . . . . . . . . . 610317
Bump Head Knob Assembly . . . . . . . . . . . . . . . . 153066
Fuel Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180000
Edger Blade . . . . . . . . . . . . . . . . . . . . . . . . . . . . 613223
Shoulder Strap . . . . . . . . . . . . . . . . . . . . . . . . . . 682075
0.020 in.
(0.5 mm.)
Fig. 39
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