Yamaha 2004 YP400, Service Manual, Page: 33 / 417

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SPEC
ENGINE SPECIFICATIONS
Oil pump
Oil pump type Trochoid ----
Inner-rotor-to-outer-rotor-tip clear-
ance 0.07 mm
(0.0028 in) 0.15 mm
(0.0059 in)
Outer-rotor-to-oil-pump-housing
clearance 0.013 ~ 0.036 mm
(0.0005 ~ 0.0014 in) 0.106 mm
(0.0042 in)
Oil-pump-housing-to-inner-and-outer
rotor clearance 0.040 ~ 0.096 mm
(0.0016 ~ 0.0038 in) 0.166 mm
(0.0065 in)
Cooling system
Radiator capacity 1.57 L (1.38 Imp qt, 1.66 US qt) ----
Radiator cap opening pressure 110.0 ~ 140.0 kPa
(1.10 ~ 1.40 kg/cm
2
, 15.6 ~ 19.9 psi)
----
Radiator core
Width 260 mm (10.24 in) ----
Height 148 mm (5.83 in) ----
Depth 24 mm (0.94 in) ----
Coolant reservoir
Capacity 0.32 L (0.28 Imp qt, 0.34 US qt) ----
Water pump
Water pump type Single-suction centrifugal pump ----
Reduction ratio 37/22
×
25/37 (1.136) ----
Coolant temperature 90 ~ 100 °C (194 ~ 212 °F) ----
Starting system type Electric starter ----
Electric fuel injection
Type 1100-87C00-A ----
Manufacturer AISAN ----
Spark plug
Model (manufacturer)
×
quantity CR7E (NGK)
×
1 ----
Spark plug gap 0.7 ~ 0.8 mm (0.028 ~ 0.031 in) ----
Cylinder head
Volume 30.3 ~ 31.1 cm
3
(1.85 ~ 1.90 cu.in) ----
Maximum warpage ---- 0.05 mm
(0.002 in)
Item Standard Limit