14
Servicing the Spark Plug
Use a NGK BPR6ES, Champion RN9YC, or BOSCH
WR6DC spark plug or equivalent.
1. Stop the engine and wait for all moving parts to stop.
2. Rotate the discharge chute so that it faces forward.
3. Remove the discharge chute, the discharge chute
handle by removing the three carriage bolts and flange
nuts (Figure 27).
4. Remove the six screws that secure the shroud as-
sembly (Figure 28).
5. Remove the oil fill cap.
6. Remove the shroud assembly (Figure 28).
7. Install the oil fill cap.
8. Disconnect the spark plug wire from the spark plug
(Figure 29).
9. Clean around the spark plug.
10. Remove the spark plug from the cylinder head.
IMPORTANT:
Replace a cracked, fouled, or dirty spark
plug. Do not clean the electrodes because grit entering
the cylinder can damage the engine.
11. Set the gap on the plug to 0.030 inch (0.76 mm)
(Figure 30).
12. Install the spark plug and torque it to 20–22 ft-lb (27–30
N-m).
13. Connect the spark plug wire to the spark plug
(Figure 29).
14. Remove the oil fill cap.
15. Install the shroud with the screws removed in step 4
(Figure 28).
NOTE:
Ensure that the shroud assembly fits together in
the side grooves.
16. Install the oil fill cap.
17. Install the discharge chute, and the discharge chute
handle onto the snowthrower using the hardware re-
moved in step 3 (Figure 27).
1. Spark plug wire
Figure 29
1
Figure 30
0.030 inch
(0.76 mm)
1. Screw
3. Oil fill cap
2. Shroud assembly
Figure 28
1
2
3
Figure 27
2
3
1
1. Discharge chute
2. Carriage bolts
3. Flange nuts
Summary of Contents for 96188000300
Page 1: ...MC621 MC621 Owner s Manual ...
Page 27: ...27 SERVICE NOTES ...
