Yamaha YZF-R25, Service Manual

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TIGHTENING TORQUES
2-12
EAS20017
TIGHTENING TORQUES
EAS30015
GENERAL TIGHTENING TORQUE
SPECIFICATIONS
This chart specifies tightening torques for stan-
dard fasteners with a standard ISO thread pitch.
Tightening torque specifications for special com-
ponents or assemblies are provided for each
chapter of this manual. To avoid warpage, tight-
en multi-fastener assemblies in a crisscross pat-
tern and progressive stages until the specified
tightening torque is reached. Unless otherwise
specified, tightening torque specifications re-
quire clean, dry threads. Components should be
at room temperature.
EAS30016
ENGINE TIGHTENING TORQUES
A. Distance between flats
B. Outside thread diameter
A (nut) B (bolt)
General tightening torques
Nm m·kgf ft·lbf
10 mm 6 mm 6 0.6 4.3
12 mm 8 mm 15 1.5 11
14 mm 10 mm 30 3.0 22
17 mm 12 mm 55 5.5 40
19 mm 14 mm 85 8.5 61
22 mm 16 mm 130 13.0 94
Item
Thread
size
Q’ty Tightening torque Remarks
Air filter case joint clamp screw M5 2 2.5 Nm (0.25 m·kgf, 1.8 ft·lbf)
Air filter case bolt M6 2 7 Nm (0.7 m·kgf, 5.1 ft·lbf)
Air filter case side cover screw (left) M5 3 2.5 Nm (0.25 m·kgf, 1.8 ft·lbf)
Air filter case side cover screw (right) M5 8 1.3 Nm (0.13 m·kgf, 0.94 ft·lbf)
Spark plug M10 2 13 Nm (1.3 m·kgf, 9.4 ft·lbf)
O
2
sensor M12 1 25 Nm (2.5 m·kgf, 18 ft·lbf)
Muffler protector (outer) M6 1 8 Nm (0.8 m·kgf, 5.8 ft·lbf)
Muffler protector (inner) M6 2 8 Nm (0.8 m·kgf, 5.8 ft·lbf)
Exhaust pipe protector bracket bolt M6 2 10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Exhaust pipe nut M8 4 15 Nm (1.5 m·kgf, 11 ft·lbf)
Exhaust pipe bolt M8 1 20 Nm (2.0 m·kgf, 14 ft·lbf)
Muffler assembly bolt M8 1 20 Nm (2.0 m·kgf, 14 ft·lbf)
Exhaust pipe joint bolt M8 1 20 Nm (2.0 m·kgf, 14 ft·lbf)
Exhaust pipe protector bolt M6 3 8 Nm (0.8 m·kgf, 5.8 ft·lbf)
Engine ground lead bolt M6 1 10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Camshaft cap bolt M6 12 10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Camshaft sprocket bolt M7 4 20 Nm (2.0 m·kgf, 14 ft·lbf)
LT
LT
LT
LT
E