Yamaha 2009 YFM25RY Service Manual page 160

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3. Check:
• O-rings "1"
Damage → Replace the drive chain.
• Drive chain rollers "2"
Damage/wear → Replace the drive
chain.
• Drive chain side plates "3"
Damage/wear → Replace the drive
chain.
Cracks → Replace the drive chain.
4. Lubricate:
• Drive chain
Recommended lubricant
Engine oil or chain lubricant
suitable for O-ring chains
EAS23460
CHECKING THE DRIVE SPROCKET
1. Check:
• Drive sprocket
More than 1/4 tooth "a" wear → Replace
the drive chain sprockets as a set.
Bent teeth → Replace the drive chain
sprockets as a set.
b. Correct
1. Drive chain roller
2. Drive chain sprocket
EAS23470
CHECKING THE REAR WHEEL SPROCKET
Refer to "CHECKING THE DRIVE
SPROCKET" on page 4-59.
EAS4D3F030
CHECKING THE SPROCKET BRACKET
Refer to "CHECKING THE SPROCKET
BRACKET" on page 4-14.
EAS23500
INSTALLING THE DRIVE CHAIN
1. Lubricate:
• Drive chain
• Master link
Recommended lubricant
Engine oil or chain lubricant
suitable for O-ring chains
2. Install:
• Drive chain
• Drive sprocket "1"
• Lock washer "2"
• Drive sprocket nut "3"
Drive sprocket nut
110 Nm (11.0 m·kg, 81 ft·lb)
TIP
While applying the rear brake, tighten the drive
sprocket nut.
4-59
CHAIN DRIVE
New
New