Yamaha YZ450FX 2019 Owner's Service Manual page 195

c. After riveting, make sure the space "c", which
is inside of the connecting link "3" and inside
of the connecting plate "1", is 12.1–12.3 mm
(0.476–0.484 in).
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2. Lubricate:
• Drive chain
Recommended lubricant
Chain lubricant suitable for O-
ring chains
3. Install:
• Drive sprocket
• Lock washer
New
• Drive sprocket nut
Refer to "ENGINE REMOVAL" on page 5-1.
Drive sprocket nut
75 N·m (7.5 kgf·m, 55 lb·ft)
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 "ADJUSTING THE DRIVE CHAIN
SLACK" on page 3-27.
Drive chain slack (Maintenance
stand)
50.0–60.0 mm (1.97–2.36 in)
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.
4-67
CHAIN DRIVE