Yamaha F50F, Service Manual

Page: 28 / 305

SPEC
Specifications
2-5
6C13G11
Maintenance specification
2
Power unit
Item Unit
Model
F50FED F50FEHT F50FET FT50GET
Power unit
Minimum compression
pressure
(*1)
kPa
(kgf/cm
2
, psi)
960 (9.6, 139.2)
Oil pressure
(*2)
kPa
(kgf/cm
2
, psi)
125 (1.25, 18.1) at engine idle speed
Cylinder head
Warpage limit mm (in) 0.10 (0.0039)
(lines indicate straightedge
position)
Journal inside diameter
mm (in) 37.000–37.025 (1.4567–1.4577)
Cylinders
Bore size mm (in) 65.000–65.015 (2.5591–2.5596)
Taper limit mm (in) 0.08 (0.0032)
Out-of-round limit mm (in) 0.05 (0.0020)
Pistons
Piston diameter (D) mm (in) 64.950–64.965 (2.5571–2.5577)
Measuring point (H) mm (in) 5.0 (0.20)
Piston clearance mm (in) 0.035–0.065 (0.0014–0.0026)
Piston pin boss bore mm (in) 15.974–15.985 (0.6289–0.6293)
Oversize piston diameter
1st mm (in) 65.200–65.215 (2.5669–2.5675)
2nd mm (in) 65.450–65.465 (2.5768–2.5774)
Piston pins
Outside diameter mm (in) 15.965–15.970 (0.6285–0.6287)
Piston rings
Top ring
Dimension B mm (in) 1.17–1.19 (0.0461–0.0469)
Dimension T mm (in) 2.30–2.50 (0.0905–0.0984)
End gap mm (in) 0.15–0.30 (0.0059–0.0118)
Side clearance mm (in) 0.02–0.06 (0.0008–0.0024)
(*1)
Measure conditions:
Ambient temperature 20 °C (68 °F), wide open throttle, with spark plugs removed from all cylinders.
The figures are for reference only.
(*2)
The figures are for reference only.