Checking The Drive Sprocket; Checking The Rear Wheel Sprocket; Installing The Drive Chain - Yamaha YZ450FP 2023 Owner's Service Manual

5. Lubricate:
• Drive chain
EAM30077

CHECKING THE DRIVE SPROCKET

1. Check:
• Drive sprocket
More than 1/4 tooth wear "a"  Replace the
drive sprocket and the rear wheel sprocket as
a set.
Bent tooth  Replace the drive sprocket and
the rear wheel sprocket as a set.
b. Correct
1. Drive chain roller
2. Drive sprocket
EAM30078

CHECKING THE REAR WHEEL SPROCKET

Refer to "CHECKING AND REPLACING THE
REAR WHEEL SPROCKET" on page 4-13.
EAM30079

INSTALLING THE DRIVE CHAIN

1. Install:
• Master link "1"
• Master link plate "2"
• Master link clip "3"
New
EWA20250
WARNING
When installing the joint clip, always keep
the direction as shown in the figure.
1
G089069
G089070
2. Lubricate:
• Drive chain
3. Install:
• Drive sprocket
• Lock washer
New
• Drive sprocket nut
Drive sprocket nut
90 N·m (9.0 kgf·m, 66 lb·ft)
LOCTITE®
ECA14300
NOTICE
Never install a new drive chain onto worn
drive chain sprockets; this will dramatically
shorten the drive chain's life.
TIP
After the drive sprocket nut has been tightened
to specification, firmly bend the lock washer tabs
"a" along the flat of the drive sprocket nut.
a a a
4. Adjust:
• Drive chain slack
Refer to "DRIVE CHAIN SLACK" on page
4-76
CHAIN DRIVE
2
3