Replacing The Spark Plug; Accessories/Replacement Parts - Ryobi 780r Operator's Manual

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.
0.020 in.
(0.5 mm.)
26
Fig. 42
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