Checking The Exhaust System; Cleaning The Spark Arrester - Yamaha YFM70RY Service Manual

1
ECA13450
NOTICE
Make sure the crankcase breather hose is
routed correctly.
EAS21080

CHECKING THE EXHAUST SYSTEM

The following procedure applies to all of the ex-
haust pipes and gaskets.
1. Check:
• Exhaust pipe "1"
• Muffler "2"
• Muffler protector "3"
• Exhaust pipe protector "4"
Cracks/damage → Replace.
• Gaskets "5"
Exhaust gas leaks → Replace.
2. Check:
• Tightening torque
Exhaust pipe nut "6"
20 Nm (2.0 m·kg, 14 ft·lb)
Exhaust pipe bolt "7"
16 Nm (1.6 m·kg, 11 ft·lb)
Muffler bolt "8"
38 Nm (3.8 m·kg, 27 ft·lb)
Exhaust pipe and muffler bolt "9"
18 Nm (1.8 m·kg, 13 ft·lb)
Muffler protector bolt "10"
8 Nm (0.8 m·kg, 5.8 ft·lb)
Exhaust pipe protector bolt "11"
8 Nm (0.8 m·kg, 5.8 ft·lb)
8
10
2
3 9
LT
LT
LT
EAS28970

CLEANING THE SPARK ARRESTER

1. Clean:
• Spark arrester
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EWA14680
WARNING
• Select a well-ventilated area free of com-
bustible materials.
• Always let the exhaust system cool before
performing this operation.
• Do not start the engine when removing the
tailpipe from the muffler.
a. Remove the bolt "1".
b. Remove the tailpipe "2" by pulling it out of the
muffler.
c. Tap the tailpipe lightly with a soft-face ham-
mer or suitable tool, then use a wire brush to
remove any carbon deposits from the spark
arrester portion of the tailpipe and the inner
contact surfaces of the muffler.
2
1
3-16
2
5
5
11
11
LT
11
LT
4
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ENGINE
5
1
6
7
6
1
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