Power Unit Technical Data; Power Unit; Cylinder Head Assembly - Yamaha F50D Servise Manual

SPEC

Power unit technical data

Power unit

Item
Cylinder
Minimum compression pres-
sure (*1)
Engine oil
Oil pressure (*2)
at 60 °C (140 °F) with SL
10W-30 engine oil and at
900 r/min

Cylinder head assembly

Item
Cylinder head
Warpage limit
Valve stem
Diameter
Intake
Exhaust
Runout
Intake
Exhaust
Valve stem guide
Inside diameter
Intake
Exhaust
Stem-to-guide clearance
Intake
Exhaust
Valve spring
Free length
Tilt
(*1) Measuring conditions:
Ambient temperature 20 °C (68 °F), wide open throttle, with spark plugs removed from all cylin-
ders. The figures are for reference only.
(*2) For details of the checking method, see "Checking the oil pressure" (7-1). The figures are for ref-
erence only.
1-9
Specification
Unit
kPa
(kgf/cm
kPa
(kgf/cm
Unit
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
F50DET
2
, psi)
2
, psi)
F50DET
5.475–5.490 (0.2156–0.2161)
5.460–5.475 (0.2150–0.2156)
5.500–5.512 (0.2165–0.2170)
5.500–5.512 (0.2165–0.2170)
0.010–0.037 (0.0004–0.0015)
0.025–0.052 (0.0010–0.0020)
Model
FT50CET FT50CED
840.0 (8.4, 121.8)
160.0 (1.6, 23.2)
Model
FT50CET FT50CED
0.10 (0.0039)
0.030 (0.0012)
0.030 (0.0012)
39.85 (1.569)
1.7 (0.07)
FT50CEHD
FT50CEHD