Tightening Torques - Yamaha WR250F Owner's Service Manual

Rectifier/regulator:
Regulator type
Model/manufacture
Regulated voltage (AC)
Regulated voltage (DC)
Rectifier capacity (AC)
Rectifier capacity (DC)
Electric starting system:
Type
Starter motor:
Model/manufacturer
Operation voltage
Output
Armature coil resistance
Brush overall length
Brush quantity
Spring force
Commutator diameter
Mica undercut (depth)
Starter relay:
Model/manufacturer
Amperage rating
Coil winding resistance
Starting circuit cut-off relay:
Model/manufacturer
Coil winding resistance
Fuse (amperage×quantity):
Main fuse
Reserve fuse

TIGHTENING TORQUES

ENGINE
△
- marked portion shall be checked for torque tightening after break-in or before each race.
Part to be tightened
Spark plug
Camshaft cap
Cylinder head blind plug screw
Cylinder head (stud bolt)
Cylinder head (stud bolt)
Cylinder head (bolt)
Cylinder head (nut)
Cylinder head cover
Item
TIGHTENING TORQUES
Standard
Semiconductor short circuit
SH770AA/SHINDENGEN
12.5–13.5 V
14.0–15.0 V
12 A
8 A
Constant mesh
5UM01/YAMAHA
12 V
0.35 kW
Ω
0.0189–0.0231 at 20 °C (68 °F)
7 mm (0.28 in)
2 pcs.
3.92–5.88 N (400–600 g, 14.1–21.2 oz)
17.6 mm (0.69 in)
1.5 mm (0.06 in)
2768090-A/JIDECO
180 A
Ω
4.2–4.6 at 20 °C (68 °F)
ACM33221 M38/MATSUSHITA
Ω
75.69–92.51 at 20 °C (68 °F)
10 A × 1
10 A × 1
Thread size Q'ty
M10S × 1.0
M6 × 1.0
M12 × 1.0
M6 × 1.0
M8 × 1.25
M9 × 1.25
M6 × 1.0
M6 × 1.0
2-11
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3.5 mm (0.14
in)
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16.6 mm (0.65
in)
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Tightening torque
Nm m•kg
1 13 1.3
10 10 1.0
1 28 2.8
2 7 0.7
1 15 1.5
4 38 3.8
2 10 1.0
2 10 1.0
Limit
ft•lb
9.4
7.2
20
5.1
11
27
7.2
7.2