Honda CRF450RL 2021 - Page 77

Maintenance
2-51
DRIVE CHAIN ROLLER
INSPECTION
Inspect the drive chain rollers for excessive wear or
binding.
Measure the upper drive chain roller (Green) [1] and
lower drive chain roller (Black) [2] O.D.
Replace the drive chain roller if necessary.
Remove the drive chain upper roller bolt [3] and drive
chain upper roller.
Install the drive chain upper roller with the " " mark [4]
facing out as shown.
Install and tighten a new drive chain upper roller bolt to
the specified torque.
Remove the drive chain lower roller nut [5] and drive
chain lower roller.
Install the drive chain lower roller with the " " mark [6]
facing out as shown.
Install and tighten the drive chain lower roller nut to the
specified torque.
SERVICE LIMIT:
Upper: 31 mm (1.2 in)
Lower: 31 mm (1.2 in)
TORQUE: 12 N·m (1.2 kgf·m, 9 lbf·ft)
TORQUE: 12 N·m (1.2 kgf·m, 9 lbf·ft)
[4]
[2]
[1]
[5]
[2]
[1]
[6]
[3]
[5][2]
DRIVE/DRIVEN SPROCKET
WEAR INSPECTION
Inspect the drive and driven sprocket teeth for wear or
damage, replace them if necessary.
Never use a new drive chain on worn sprockets.
Both chain and sprockets must be in good condition or
the new replacement chain will wear rapidly.
TIGHTENING INSPECTION
Remove the drive sprocket cover 1-7.
Check the bolts and nuts on the drive and driven
sprockets.
If any are loose, torque them.
Install the drive sprocket cover 1-7.
DAMAGE
WEAR
NORMAL
TORQUE:
Drive sprocket bolt:
31 N·m (3.2 kgf·m, 23 lbf·ft)
Driven sprocket nut:
32 N·m (3.3 kgf·m, 24 lbf·ft)