Husqvarna ST 121E Owners Manual - Page 14

Servicing the Spark Plug

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MAINTENANCE Servicing the Spark Plug Use a NGK BPR6ES, Champion RN9YC, or BOSCH WR6DC spark plug or equivalent. 1. Move snow thrower to a level surface. 2. Run snow thrower until all fuel has been depleted. 3. Wait until engine is cool. 4. Rotate the discharge chute so that it faces forward. 5. Remove the discharge chute by removing the three carriage bolts and three flange nuts (Figure 26). 8. Unsnap top cover by firmly pulling upwards at the rear section of the cover disengaging the three clips (Figure 28). 9. Shift top cover until fuel tank is clear of the rear upper cover and set top cover to the side of the unit. 10. Temporarily reinstall oil fill cap to prevent foreign object from entering the engine. 11. Remove 2 screws in the side cover and rear covers on both sides. 2 3 1 4 1 3 3 22 3 3 Figure 26 1. Discharge chute 2. Carriage bolts 3. Flange nuts 6. Remove two screws in plenum that hold top cover (Figure 27). 7. Remove the oil fill cap. 2 3 1 1. Top cover 2. Clips Figure 28 3. Screw 4. Rear upper cover 12. Unplug electrical wires on back of ignition switch (Figure 29). 13. Pull tube off the back of the primer bulb. 24 24 4 1. Screw 2. Plenum Figure 27 3. Oil fill cap 4. Top cover 1 3 Figure 29 1. Electrical wires 2. Ignition switch 3. Tube 4. Primer bulb 14. Lift rear upper cover and lay it to the side of the unit. IMPORTANT: The recoil rope will still be attached to the upper cover. 14

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14
MAINTENANCE
Servicing the Spark Plug
Use a NGK BPR6ES, Champion RN9YC, or BOSCH
WR6DC spark plug or equivalent.
1.
Move snow thrower to a level surface.
2.
Run snow thrower until all fuel has been depleted.
3.
Wait until engine is cool.
4.
Rotate the discharge chute so that it faces forward.
5.
Remove the discharge chute by removing the three
carriage bolts and three flange nuts (Figure 26).
6.
Remove two screws in plenum that hold top cover
(Figure 27).
7.
Remove the oil fill cap.
12.
Unplug electrical wires on back of ignition switch
(Figure 29).
13.
Pull tube off the back of the primer bulb.
1. Screw
3. Oil fill cap
2. Plenum
4. Top cover
1. Top cover
3. Screw
2. Clips
4. Rear upper cover
1. Electrical wires
3. Tube
2. Ignition switch
4. Primer bulb
Figure 27
Figure 28
Figure 29
1
1
3
4
2
2
3
3
3
4
Figure 26
3
3
2
2
1
1. Discharge chute
3. Flange nuts
2. Carriage bolts
14.
Lift rear upper cover and lay it to the side of the unit.
IMPORTANT:
The recoil rope will still be attached to the
upper cover.
8.
Unsnap top cover by firmly pulling upwards at the
rear section of the cover disengaging the three clips
(Figure 28).
9.
Shift top cover until fuel tank is clear of the rear upper
cover and set top cover to the side of the unit.
10.
Temporarily reinstall oil fill cap to prevent foreign object
from entering the engine.
11.
Remove 2 screws in the side cover and rear covers
on both sides.
1
2
4
4
2
3