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Yamaha F40B - Power Unit

Yamaha F40B
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67C3K11 2-14
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Power unit
Item Unit
Model
F30AEHT F30AET F40BWHT F40BET
Power unit
Minimum compression
pressure
(*1)
kPa
(kgf/cm
2
, psi)
830 (8.3, 120.4)
Oil pressure
(*2)
kPa
(kgf/cm
2
, psi)
210 (2.1, 30.5) at 52 °C (126 °F) with SL
10W-30 engine oil and at engine idle speed
Cylinder head
Warpage limit mm (in) 0.10 (0.0039)
(lines indicate straightedge
position)
Cylinder head journal inside
diameter (A)
mm (in) 37.00037.025 (1.45671.4577)
Camshaft
Intake and
exhaust (A)
mm (in) 30.83431.034 (1.21391.2218)
Intake and
exhaust (B)
mm (in) 25.90026.100 (1.01971.0276)
Camshaft journal diameter (C) mm (in) 36.92536.945 (1.45371.4545)
Camshaft journal diameter (D) mm (in) 36.93536.955 (1.45411.4549)
Camshaft runout limit mm (in) 0.03 (0.0012)
Rocker arm shaft
Outside diameter mm (in) 15.97115.991 (0.62880.6296)
(*1)
Measuring conditions:
Ambient temperature 20 °C (68 °F), wide open throttle, with spark plugs removed from all cylinders.
The figures are for reference only.
(*2)
For details of the checking method, see Checking the oil pressure (5-1).
The figures are for reference only.
A
A
A
C
D
D
Maintenance specification

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