MTD BCR4 - Manual (Page 21)

MAINTENANCE & REPAIR INSTRUCTIONS
21
FIGURE 31
REPLACING THE SPARK PLUG
Use a Champion RDZ19H spark plug (or equivalent). The
correct air gap is
0.635 mm (0.025 in.) 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-inch
socket counterclockwise.
3. Replace cracked, fouled or dirty spark plug. Set the
air gap at 0.635 mm (0.025 in.) using a feeler
gauge. See Figure 32.
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:
12.3-13.5 N•m (110-120 in.•lb.)
Do not over tighten.
0.635 mm
(0.025 in.)
CLEANING
WARNING: To avoid serious personal injury,
always turn your trimmer off and allow it to
cool before you clean or perform any
maintenance.
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.
LONG TERM STORAGE
If the unit will be stored for an extended time, use the
following storage procedure:
1. Drain all petrol (gasoline) from the fuel tank into a
container. Do not use petrol that has been stored
for more than 60 days. Dispose of the old fuel 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.
NOTE: Remove the spark plug and drain all of the oil
from the cylinder before attempting to start
the trimmer after storage.
3. 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.