SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

REPLACING THE SPARK PLUG

Use only genuine MTD spark plugs. The correct air gap is 0.025 in. (0.655 mm.). Remove the plug after every 50 hours of operation and check its condition.

1.Stop the engine and allow it to cool. Grasp the plug wire firmly and pull the cap from the spark plug.

2.Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket counterclockwise.

3.Replace cracked, fouled or dirty spark plug. Set the air gap at 0.025 in. (0.655 mm.) using a feeler gauge (Fig. 44).

0.025 in.

(0.655 mm.)

Fig. 44

CAUTION: Do not sand blast, scrape, or clean electrodes. Grit in the engine could damage the cylinder.

4.Install a correctly gapped spark plug in the cylinder head. Tighten by turning the 5/8 in. socket clockwise until snug.

If using a torque wrench torque to; 110-120 in.•lb. (12.3-13.5 N•m). Do not over tighten.

5. Replace the spark plug wire.

NOTE: A replacement spark plug Part # 791-180852 can be purchased from your local authorized dealer.

SPARK ARRESTOR MAINTENANCE

1.Remove the muffler cover. See Rocker Arm Clearance in the Maintenance and Repair Instructions section.

2.With a flat blade screwdriver or Torx T20 bit, remove the screw attaching the spark arrestor cover to the muffler (Fig. 45).

Muffler

Spark Arrestor Screen

Tab Screw

Spark Arrestor Cover

Slot

Fig. 45

3.Pull the tab on the spark arrestor cover out of the muffler. Remove the spark arrestor cover.

4.Remove the spark arrestor screen from the spark arrestor cover.

5.Clean the spark arrestor screen with a wire brush, or replace.

6.Reinstall the spark arrestor screen, spark arrestor cover, and screw.

NOTE: A replacement spark arrestor screen Part # 791- 180890 can be purchased from your local authorized dealer.

ACCESSORIES/REPLACEMENT PARTS

4-Cycle Oil . . . . . . . . . . . . . . . . . . . . . . . . . . 791-181786

Oil Fill Plug / Dipstick . . . . . . . . . . . . . . . . . . 791-182378

Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . 791-180852B

Spark Arrestor Screen . . . . . . . . . . . . . . . . . 791-180890

Replacement Line Cartridge . . . . . . . . . . .791-181460B

Inner Reel Spring . . . . . . . . . . . . . . . . . . . . 791-181465B

Bump Head™ Knob Assembly . . . . . . . . . 791-181468B

Fuel Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . 791-181083

Shoulder Harness . . . . . . . . . . . . . . . . . . .791- 682075B

EZ-Link Coupler . . . . . . . . . . . . . . . . . . . . 791-181616B

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