Yamaha F150B - Power Unit Technical Data; Power Unit; Cylinder Head Assembly

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Power unit technical data
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Power unit technical data
Power unit
(*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” (7-2). The figures are for reference
only.
Cylinder head assembly
Item Unit
Model
F150B FL150B
Cylinder
Minimum compression pres-
sure (*1)
kPa (kgf/
cm
2
, psi)
880.0 (8.80, 127.6)
Engine oil
Oil pressure (*2)
at 60 °C (140 °F) with SL
10W-30 engine oil and at
700 r/min
kPa (kgf/
cm
2
, psi)
450.0 (4.50, 65.3)
Replacement engine oil quan-
tity (at periodic maintenance)
Without oil filter replacement
L (US qt,
lmp qt)
4.30 (4.54, 3.78)
With oil filter replacement
L (US qt,
lmp qt)
4.50 (4.76, 3.96)
Item Unit
Model
F150B FL150B
Cylinder head
Warpage limit mm (in) 0.1 (0.0039)
Valve stem
Diameter
Intake mm (in) 5.477–5.492 (0.2156–0.2162)
Exhaust mm (in) 5.464–5.479 (0.2151–0.2157)
Runout limit
Intake mm (in) 0.01 (0.0004)
Exhaust mm (in) 0.01 (0.0004)
Valve stem guide
Inside diameter
Intake mm (in) 5.504–5.522 (0.2167–0.2174)
Exhaust mm (in) 5.504–5.522 (0.2167–0.2174)
Stem-to-guide clearance
Intake mm (in) 0.025–0.058 (0.0010–0.0023)
Exhaust mm (in) 0.025–0.058 (0.0010–0.0023)
Valve spring
Free length mm (in) 44.2 (1.74)
Tilt limit mm (in) 1.2 (0.05)
Fuel system technical data / Power unit technical data