Husqvarna ST 121E Owners Manual - Page 15

Remove top oil fill cap. - 21 inch

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MAINTENANCE 15. Disconnect the spark plug wire from the spark plug (Figure 30). 16. Clean around the spark plug. 17. Remove the spark plug from the cylinder head. 1 19. Install the spark plug and torque it to 20-22 ft-lb (27-30 N-m). 20. Connect the spark plug wire to the spark plug (Figure 30). 21. Reattach primer bulb tube to primer bulb and electrical wires on back ignition switch of rear upper cover (Figure 29). 22. Set rear upper cover in place so the two screw holes line up with the rear lower cover and side covers (Figure 32). 23. Reattach two screws through the rear covers and into the clip on the side cover (Figure 27). Figure 30 1. Spark plug wire IMPORTANT: Replace a cracked, fouled, or dirty spark plug. Do not clean the electrodes because grit entering the cylinder can damage the engine. 18. Set the gap on the plug to 0.030 inch (0.76 mm) (Figure 31). 0.030 inch (0.76 mm) Figure 31 Figure 32 24. Remove top oil fill cap. 25. Set top cover in place and snap three top cover clips into the rear upper cover (Figure 28). 26. Reinstall top oil fill cap. 27. Reinstall two screws in the side covers that attach to the clips on the top cover. 28. Reinstall two screws in the plenum that attach to the top cover (Figure 27). 29. Reinstall discharge chute with the hardware removed in step 5. 15

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15
MAINTENANCE
15.
Disconnect the spark plug wire from the spark plug
(Figure 30).
16.
Clean around the spark plug.
17.
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.
18.
Set the gap on the plug to 0.030 inch (0.76 mm)
(Figure 31).
1. Spark plug wire
Figure 30
1
Figure 31
Figure 32
0.030 inch
(0.76 mm)
19.
Install the spark plug and torque it to 20–22 ft-lb
(27–30 N-m).
20.
Connect the spark plug wire to the spark plug
(Figure 30).
21.
Reattach primer bulb tube to primer bulb and electri-
cal wires on back ignition switch of rear upper cover
(Figure 29).
22.
Set rear upper cover in place so the two screw holes
line up with the rear lower cover and side covers
(Figure 32).
23.
Reattach two screws through the rear covers and into
the clip on the side cover (Figure 27).
24.
Remove top oil fill cap.
25.
Set top cover in place and snap three top cover clips
into the rear upper cover (Figure 28).
26.
Reinstall top oil fill cap.
27.
Reinstall two screws in the side covers that attach to
the clips on the top cover.
28.
Reinstall two screws in the plenum that attach to the
top cover (Figure 27).
29.
Reinstall discharge chute with the hardware removed
in step 5.