Ryobi 780r Replacing The Spark Plug, Accessories/Replacement Parts, 110-120 in.lb. 12.3-13.5 Nm

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 the cap from the spark plug.

2.Clean dirt from 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. 42).

CAUTION: Do not sand blast, scrape, or clean electrodes. Grit in the engine could damage the cylinder.

4.Install a correctly gaped 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 . . . . . . . . . . . . . . . . 612454

Replacement Line Cartridge . . . . . . . . . 147345

Inner Reel Spring . . . . . . . . . . . . . . . . . 610636

Bump Head Knob Assembly . . . . . . . . 180814

Outer Spool . . . . . . . . . . . . . . . . . . . . .147494

Cutting Attachment Head Assembly . . .147498

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

Shoulder Harness . . . . . . . . . . . . . . . . 682075

Cutting Blade . . . . . . . . . . . . . . . . . . . . 145873

Blade Retaining Kit . . . . . . . . . . . . . . . .180014

0.020 in.

(0.5 mm.)

Fig. 42

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