Inspecting/Cleaning The Muffler; Cleaning; Storage - Toro 51903 Manuel De L'utilisateur

3. Set the air gap at 0.020 in (0.5 mm) using a wire
feeler gauge (Fig. 32). Install a correctly gapped
spark plug into the cylinder head. Torque to
110-120 in lb (12.3-13.5 N m).
Inspecting/Cleaning The
Muffler
The muffler should be removed every 25 hours of
operation to inspect for excessive carbon build-up.
Excessive deposits around the exhaust ports or
exhaust holes will cause poor engine performance.
Use the following procedure to remove, inspect, clean
and reinstall the muffler.
POTENTIAL HAZARD
Muffler surface becomes hot when trimmer
is in operation and remains hot for some
time after the engine is shut off.
WHAT CAN HAPPEN
Contact with hot muffler surfaces could
cause a burn.
HOW TO AVOID THE HAZARD
Make sure the muffler is cool before
inspecting and cleaning it.
1. Remove the muffler mounting bolts (Fig. 33).
2. Remove the muffler (with heat shield) and
gasket. Discard the old gasket.
Inspection And Cleaning
1. Check the inlet port of the muffler and outlet
port of the cylinder for excessive carbon deposits
(Fig. 34). Clean as required.
2. Inspect the muffler mounting holes for
elongation. Replace the muffler if the holes are
elongated.
Muffler Reassembly
1. Install a new gasket. Make sure the arrow
stamped into the gasket is to your right. Tuck the
tab (with the arrow) between the cylinder and
plastic shroud (Fig. 35).
2. Install the muffler with the muffler mounting
bolts (see Fig. 33) and torque the bolts to 80-90
in lb (9-10.1 N m).

Cleaning

POTENTIAL HAZARD
When engine is running, cutting head is
rotating and other parts are moving.
WHAT CAN HAPPEN
Contact with rotating cutting head or other
moving parts could cause serious personal
injury or death.
HOW TO AVOID THE HAZARD
Always turn off your trimmer before you
clean or perform any maintenance on it.
Use a small brush to clean off the outside of the
trimmer. Do not use strong detergents on plastic
housing or handle. They can be damaged by
household cleaners that contain aromatic oils such as
pine and lemon, and by solvents such as kerosene.
Wipe off any moisture with a soft cloth.

Storage

If the trimmer will be stored for an extended period of
time, use the following storage procedure.
1. Drain all fuel from the fuel tank and drain 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
a safe manner and use a fresh mix.
EN–12