Yard-Man YM300 - Manual (Page 16)

16
SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS
Replacing the Spark Plug
Use a Champion RDJ7Y spark plug (or equivalent). The
correct air gap is 0.020 inch (0.5 mm). Remove the plug
after every 25 hours of operation and check its condition.
1. Stop the engine and allow it to cool. Grasp the plug
wire firmly and pull it from the spark plug.
2. Clean 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 0.020 in. (0.5 mm) using a feeler gauge.
See Figure 29.
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 inch 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.
Accessories/Replacement Parts
2-Cycle Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182780
Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610311
Spark Arrestor . . . . . . . . . . . . . . . . . . . . . . . . . . . .182747
Replacement Line . . . . . . . . . . . . . . . . . . . . . . . . 610375
Replacement Line Cartridge . . . . . . . . . . . . . . . . 153577
Inner Reel Spring . . . . . . . . . . . . . . . . . . . . . . . . . 610317
Bump Knob . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153066
Bump Head Assembly . . . . . . . . . . . . . . . . . . . . . 180897
Fuel Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180000
Shoulder Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . 682075
These replacement parts can be purchased from your
local authorized dealer.
0.020 in.
(0.5 mm)
Long Term Storage
If the unit will be stored for an extended time, use the
following storage procedure:
1. Drain all fuel from the fuel tank into a container with
the same 2-cycle fuel mixture. Do not use fuel that
has been stored for more than 60 days. Dispose of
the old fuel/oil mix in accordance to Federal, State,
and Local regulations.
2. Start the engine and allow it to run until it stalls. This
ensures that all fuel has been drained from the
carburetor.
3. Allow the engine to cool. Remove the spark plug and
put 1 oz. (30 ml) of any high quality motor oil or
2 cycle oil into the cylinder. Pull the starter rope
slowly to distribute the oil. Reinstall the spark plug.
NOTE: Remove the spark plug and drain all of the oil
from the cylinder before attempting to start the
trimmer after storage.
4. Thoroughly clean the unit and inspect for any loose
or damaged parts. Repair or replace damaged parts
and tighten loose screws, nuts or bolts. The unit is
ready for storage.
Transporting
• Allow the engine to cool before transporting.
• Secure the unit while transporting.
• Drain fuel from unit.
• Tighten fuel cap before transporting.
Cleaning
WARNING: To avoid serious personal injury,
always turn your trimmer off and allow it to
cool before you clean or service it.
Use a small brush to clean off the outside of the unit. Do
not use strong detergents. Household cleaners that
contain aromatic oils such as pine and lemon, and
solvents such as kerosene, can damage plastic housing
or handle. Wipe off any moisture with a soft cloth.
Storage
• Never store the unit with fuel in the tank where fumes
may reach an open flame or spark.
• Allow the engine to cool before storing.
• Store the unit locked up to prevent unauthorized use
or damage.
• Store the unit in a dry, well-ventilated area.
• Store the unit out of the reach of children.
Figure 29