Yamaha WR450F 2021 Owner's Service Manual page 214

Bolt (exhaust pipe 2)
20 N·m (2.0 kgf·m, 15 lb·ft)
• Clamp
Clamp
12 N·m (1.2 kgf·m, 8.9 lb·ft)
TIP
Tighten while checking that their front and rear
joints are inserted in position.
ENGINE REMOVAL
5-12