23139
135-hour Maintenace
Every 135 hours of operation,
remove and clean the muffler.
5. Remove the rear muffler shield
socket head screw and, while noting
the orientation of parts, separate the
muffler shield. See Figure 18.
6. Remove the spark arrester screen
and clean with a stiff bristle brush.
7. Gently tap the muffler on a wood
surface to dislodge any loose car-
bon.
8. Inspect the cylinder exhaust port
for carbon buildup.
9. Reassemble the muffler in the
reverse order of disassembly.
Forward
Muffler
Shield
Lower Muffler
Screw
Muffler
5 mm Muffler
Screws
Rear Muffler
Shield
Spark Ar-
rester Screen
Rear Muffler
Shield Screw
Figure 18
MAINTENANCE
18
IMPORTANT!
If you note excessive carbon buildup,
consult with an authorized servicing
dealer.
WARNING!
Never operate the unit with a dam-
aged or missing muffler or spark
arrester! Operating with missing or
damaged exhaust components is a
fire hazard and could also damage
your hearing.
1. Remove the spark plug boot.
2. Remove the two 4 mm engine cover
screws (located at the top of the
recoil housing).
3. Loosen the 5 mm engine top cover
screw (the screw is captive) and lift
the cover from the engine.
4. Remove the two 5 mm muffler
screws. Remove the lower muffler
screw, then lift the muffler assem-
bly from the engine.
Summary of Contents for M231
Page 27: ...NOTES 26...
