Lawn-Boy 320 - Replacing the Spark Plug; Replacing the Rotor Blades

13
903
4
5
3
2
1
Figure 13
1. Engine pulley
2. Idler pulley
3. Brake arm
4. Rotor pulley
5. Belt
11. Have someone squeeze the control bar up against the
handle (rotor engaged position) and hold it in that
position.
12.
Install the left side of the cover while holding the
control bar against the handle.
13. T ighten fasteners securely , but do not overtighten .
Replacing the Spark Plug
Before each season, check the spark plug. If the electrodes
in center of the spark plug are dark or have deteriorated,
install a new Champion RCJ8Y spark plug or equivalent.
1. Remove the two screws that secure the control panel to
the housing (Fig. 14).
m–2578
1
2
Figure 14
1. Control panel 2. Capscrews
2. Remove the ignition key and lift of f the panel,
allowing it to hang on the recoil rope.
3. Pull the wire of f the spark plug and remove the spark
plug (Fig. 15).
m–2580
1
Figure 15
1. Spark plug wire
4. Examine the plug and replace it if it is cracked, fouled,
or dirty .
IMPORTANT
: Do not sandblast, scrape, or clean the
spark plug. Dirt may fall into the cylinder and cause
engine damage.
5. Set the air gap (Fig. 16) between the electrodes at
.030 in. (.76 mm).
110
0.030”
(0,76
mm)
Figure 16
6. Install the plug and torque it to 15 ft–lb (20.4 N m). If
you do not have a torque wrench, tighten the spark
plug firmly , but do not overtighten.
7. Push the wire onto the spark plug.
8. Install the control panel.
Replacing the Rotor Blades
Before each season, inspect the rotor blades for wear .
When a rotor blade edge has worn to the wear indicator
hole (Fig. 17), replace both rotor blades to ensure proper
performance and to prevent damage to the underside of
the snowthrower .