Husqvarna ST 151 warranty Servicing the Spark Plug

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 27).

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3 3

2 2

Figure 27

1. Discharge chute 3. Flange nuts

2.Carriage bolts

6.Remove two screws in plenum that hold top cover (Figure 28).

7.Remove the oil fill cap.

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3 1

4

		Figure 28
1.	Screw	3. Oil fill cap
2.	Plenum	4. Top cover

8.Unsnap top cover by firmly pulling upwards at the rear section of the cover disengaging the three clips (Figure 29).

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

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3 3

		Figure 29
1.	Top cover	3.	Screw
2.	Clips	4.	Rear upper cover

12.Unplug electrical wires on back of ignition switch (Figure 30).

13.Pull tube off the back of the primer bulb.

2	4
	2	4

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		Figure 30
1.	Electrical wires	3.	Tube
2.	Ignition switch	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.

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