Checking The Fuel Line; Checking The Cylinder Head Breather Hose; Checking The Exhaust System; Cleaning The Spark Arrester - Yamaha 2009 YFM25RY Service Manual

• Air filter case
Refer to "GENERAL CHASSIS" on page
4-1.
• Carburetor
Refer to "CARBURETOR" on page 6-3.
2. Check:
• Carburetor joint
• Intake manifold
Cracks/damage → Replace.
Refer to "CARBURETOR" on page 6-3.
3. Install:
• Carburetor
Refer to "CARBURETOR" on page 6-3.
• Air filter case
• Rear fender
• Front fender
• Seat
Refer to "GENERAL CHASSIS" on page
4-1.
EAS21030

CHECKING THE FUEL LINE

The following procedure applies to all of the
fuel and breather hoses.
1. Check:
• Fuel hose
• Breather hose
Cracks/damage → Replace.
Loose connection → Connect properly.
ECA14940
Make sure the fuel tank breather hose is
routed correctly.
EAS21050
CHECKING THE CYLINDER HEAD
BREATHER HOSE
1. Check:
• Cylinder head breather hose
Cracks/damage → Replace.
Loose connection → Connect properly.
ECA14920
Make sure the cylinder head breather hose
is routed correctly.
EAS21080

CHECKING THE EXHAUST SYSTEM

1. Check:
• Exhaust pipe
• Muffler
Cracks/damage → Replace.
• Gasket
Exhaust gas leaks → Replace.
2. Check:
• Tightening torque
Exhaust pipe nut
18 Nm (1.8 m·kg, 13 ft·lb)
Muffler joint bolt
20 Nm (2.0 m·kg, 15 ft·lb)
Muffler bolt
34 Nm (3.4 m·kg, 25 ft·lb)
EAS28970

CLEANING THE SPARK ARRESTER

1. Clean:
• Spark arrester
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
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 bolts "1".
b. Remove the tailpipe "2" by pulling it out of
the muffler.
c. Tap the tailpipe "2" lightly with a soft-face
hammer or suitable tool, then use a wire
brush to remove any carbon deposits from
the spark arrester portion "a" of the tailpipe
and the inner contact surfaces of the muf-
fler.
3-14
ENGINE