Power Unit Technical Data; Power Unit; Cylinder Head Assembly - Yamaha F150A Service Manual

Power unit technical data

Power unit

Compression pressure
Minimum (reference data) *1
Engine oil
Oil pressure *2
Thermostat
Valve opening temperature
Fully open temperature
Fully open stroke
Replacement engine oil quantity
(at periodic maintenance)
Without oil filter replacement
With oil filter replacement
*1.Measuring conditions: Ambient temperature 20 °C (68 °F), fully open throttle, with spark plugs
removed from all cylinders.
*2. For the checking method, see "Checking the oil pressure" (7-1). The figures are for reference
only.

Cylinder head assembly

Valve
Clearance (Intake)
Clearance (Exhaust)
Margin thickness (Intake)
Margin thickness (Exhaust)
Seat contact width (Intake)
Seat contact width (Exhaust)
Camshaft
Cam lobe height (Intake)
Cam lobe height (Exhaust)
Cam lobe width (Intake and exhaust)
Journal diameter
Runout
Cylinder head
Warpage limit
Journal inside diameter
880.0 kPa (8.80 kgf/cm
320.0 kPa (3.20 kgf/cm
(140 °F) with SL 10W-30 engine oil and at
700 r/min
500.0 kPa (5.00 kgf/cm
(144 °F) with SL 10W-30 engine oil and at
3000 r/min
58–62 °C (136–144 °F)
70 °C (158 °F)
4.3 mm (0.17 in)
4.3 L (4.55 US qt, 3.78 Imp.qt)
4.5 L (4.76 US qt, 3.96 Imp.qt)
0.17–0.24 mm (0.0067–0.0094 in)
0.31–0.38 mm (0.0122–0.0150 in)
0.40–0.80 mm (0.0157–0.0315 in)
0.80–1.20 mm (0.0315–0.0472 in)
1.10–1.40 mm (0.0433–0.0551 in)
1.40–1.70 mm (0.0551–0.0669 in)
45.310–45.410 mm (1.7839–1.7878 in)
44.360–44.460 mm (1.7465–1.7504 in)
35.950–36.050 mm (1.4154–1.4193 in)
24.960–24.980 mm (0.9827–0.9835 in)
0.030 mm (0.0012 in)
0.10 mm (0.0039 in)
25.000–25.021 mm (0.9843–0.9851 in)
1-12
Power unit technical data
2
, 127.6 psi)
2 , 46.4 psi) at 60 °C
2 , 72.5 psi) at 62 °C
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