Yamaha YFM660RN Service Manual page 34

Tightening torques
Part to be tightened
Cylinder head (exhaust pipe)
Cylinder head
Spark plug
Cylinder head cover
Camshaft end cap
Oil check bolt
Tappet cover (exhaust)
Tappet cover (intake)
Cylinder
Timing chain tensioner
Timing chain tensioner cap
Timing chain guide (intake)
Camshaft sprocket
Rocker arm shaft
Valve adjusting screw
Radiator
Coolant drain bolt
Engine oil drain bolt (oil tank)
Engine oil drain bolt (engine)
Oil filter bolt
Oil filter cartridge
Oil delivery pipe 1
Oil delivery pipe 2
Oil pipe joint
Oil pipe 1 and oil pipe joint
Oil pipe 2 and oil tank
Air filter case
Carburetor clamp
Exhaust pipe 1 and exhaust pipe 2
Exhaust pipe protector
Spark arrester
Muffler and exhaust pipe 2
Muffler
Silencer cap
Exhaust pipe
MAINTENANCE SPECIFICATIONS
Part Thread
name size
Stud bolt M6
Bolt M9
Bolt M9
Bolt M6
— M12
Bolt M6
Bolt M6
— M6
— M32
Bolt M6
Bolt M10
Bolt M10
Bolt M6
Bolt M6
Bolt M16
Bolt M6
Bolt M7
Bolt M6
Nut M6
Bolt M6
— M6
— M10
— M14
Union bolt M20
— M20
Union bolt M10
Union bolt M8
— M14
Nut M16
Nut M16
Bolt M6
Bolt M4
Bolt M8
Bolt M6
Bolt M6
Bolt M8
Bolt M8
Bolt M6
Nut M6
2 - 12
SPEC
Tightening torque
Q'ty
Nm m·kg ft·lb
4 7 0.7 5.1
4 38 3.8 27
2 38 3.8 27
1 10 1.0 7.2
1 18 1.8 13
17 10 1.0 7.2
1 10 1.0 7.2
1 7 0.7 5.1
2 12 1.2 8.7
4 10 1.0 7.2
2 42 4.2 30
2 42 4.2 30
2 10 1.0 7.2
2 10 1.0 7.2
1 22 2.2 16
2 8 0.8 5.8
2 20 2.0 14
2 10 1.0 7.2
5 14 1.4 10
2 7 0.7 5.1
1 10 1.0 7.2
1 25 2.5 18
1 30 3.0 22
1 63 6.3 45
1 17 1.7 12
2 20 2.0 14
2 18 1.8 13
1 50 5.0 36
1 35 3.5 25
1 35 3.5 25
2 7 0.7 5.1
4 5 0.5 3.6
1 16 1.6 12
4 10 1.0 7.2
1 8 0.8 5.8
1 20 2.0 14
2 26 2.6 19
3 10 1.0 7.2
4 10 1.0 7.2
Remarks
E
LT
LT