Replacing The Spark Plug; Spark Arrestor Maintenance; Accessories/Replacement Parts - Yard-Man YM26CS Operator's Manual

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.)
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.
Fig. 44

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
Slot
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
24
Spark Arrestor Screen
Tab
Spark Arrestor Cover
Fig. 45
Screw