Checking The Drive Sprocket; Checking The Rear Wheel Sprocket; Installing The Drive Chain - Yamaha YZ250 2022 Owner's Service Manual

G088942
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.
G088904
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 4-8.
EAM30079

INSTALLING THE DRIVE CHAIN

1. Install:
• Master link "1"
• Master link plate "2"
• Master link clip "3"
New
ECA14310
NOTICE
• The closed end of the master link clip must
face in the direction of drive chain rotation.
• Never install a new drive chain onto worn
drive chain sprockets; this will dramatically
shorten the drive chain's life.
2
1
1
G089069
G089070
2. Lubricate:
• Drive chain
3. Install:
• Drive sprocket
• Lock washer
• Drive sprocket nut
Refer to "ENGINE REMOVAL" on page 5-1.
ECA14300
NOTICE
Never install a new drive chain onto worn
drive chain sprockets; this will dramatically
shorten the drive chain's life.
4. Adjust:
• Drive chain slack
Refer to "DRIVE CHAIN SLACK" on page
3-16.
ECA24590
NOTICE
A drive chain that is too tight will overload
the engine and other vital parts, and one that
is too loose can skip and damage the swing-
arm or cause an accident. Therefore, keep
the drive chain slack within the specified lim-
its.
4-65
CHAIN DRIVE
2
3
New
Drive sprocket nut
75 N·m (7.5 kgf·m, 55 lb·ft)
Drive chain slack (Maintenance
Stand)
48.0–58.0 mm (1.89–2.28 in)