Ryobi SB720R Manuel de l'opérateur télécharger pdf (Page 22)

MAINTENANCE AND REPAIR INSTRUCTIONS

REPLACING THE SPARK PLUG

Use a Champion RDJ7Y spark plug

(or equivalent). The correct air gap is 0.020 in.

(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. 37).

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

Replacement Line . . . . . . . . . . . . . . . . . . 181472

Replacement Line Cartridge . . . . . . . . . . . 181460

Inner Reel Spring . . . . . . . . . . . . . . . . . . . 181465

Bump Head Knob Assembly. . . . . . . . . . . 181468

Fuel Cap. . . . . . . . . . . . . . . . . . . . . . . . . . 180000

Shoulder Strap . . . . . . . . . . . . . . . . . . . . . 682075

0.020 in.

(0.5 mm.)

Fig. 37

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 28

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Ryobi SB720R Manuel de l'opérateur Page 22