Yamaha YZ250 Owner's Service Manual page 488

SWINGARM
13. Install:
9 Bolt [chain tensioner (lower)] 1
9 Plain washer 2
9 Collar 3
9 Chain tensioner 4
9 Nut [chain tensioner (lower)] 5
14. Install:
9 Chain support 1
9 Support cover 2
9 Bolt {chain support [/=50mm (1.97in)]} 3
9 Nut (chain support) 4
9 Bolt { support cover [/=10mm (0.39in)]} 5
5-60
CHAS
19 Nm (1.9 m•kg, 13 ft•lb)
7 Nm (0.7 m•kg, 5.1 ft•lb)
7 Nm (0.7 m•kg, 5.1 ft•lb)