Ryobi 725r - Manual (Page 21)

MAINTENANCE AND REPAIR INSTRUCTIONS
21
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. 36).
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 by turning the socket
clockwise until snug. Do not over tighten.
Torque to 110-120 in.•lb. (12.3-13.5 N•m).
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. 36