G
RASS
T
RIMMER
/B
RUSH
C
UTTER
O
PERATOR
'
S
M
ANUAL
25
COOLING
SYSTEM
Level 2.
Tools required:
Air compressor and safety nozzle, or: 4 mm Hex
wrench, 25 - 50 mm (1 - 2 in.) cleaning brush.
Parts Required:
None.
IMPORTANT
To maintain proper engine operating temperatures, cooling air must
pass freely through the cylinder
fi
n area. This
fl
ow of air carries
combustion heat away from the engine.
Overheating and engine seizure can occur when:
• Air intakes are blocked, preventing cooling air from reaching the
cylinder.
• Dust and debris build-up on the outside of the cylinder. This build-up
insulates the engine and prevents the heat from leaving.
Removal of cooling passage blockages and cleaning of cooling
fi
ns is
considered “Normal Maintenance.” Any failure attributed to lack of
maintenance is not warranted.
1. Periodically blow dirt and debris off cooling
fi
ns with a compres-
sor and safety nozzle, or;
2. Remove engine and muf
fl
er covers, and brush off dirt and debris
using the medium bristle brush.
EXHAUST
SYSTEM
Spark Arrestor Screen
Level 2.
Tools Required:
Cross Head Screwdriver, Soft Metal Brush, 4 mm
Hex
Wrench
Parts Required:
Spark Arrestor Screen, Gasket
1. Remove
muf
fl
er cover (A).
2. Place piston at Top Dead Center (TDC) to prevent carbon/dirt from
entering cylinder.
3. Remove spark arrestor screen cover (B), screen holder (C), gasket
(D), and screen (E), from muf
fl
er body.
4. Clean carbon deposits from muf
fl
er components.
5. Replace screen if it is cracked, plugged, or has holes burned
through.
6. Assemble components in reverse order.
A
B
C
D
E
