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Yamaha F50F - Power Unit

Yamaha F50F
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SPEC
Specifications
2-11
6C13G11
Power unit
Item Unit
Model
F60CEHT F60CET FT60DET
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) 37.00037.025 (1.45671.4577)
Cylinders
Bore size mm (in) 65.00065.015 (2.55912.5596)
Taper limit mm (in) 0.08 (0.0032)
Out-of-round limit mm (in) 0.05 (0.0020)
Pistons
Piston diameter (D) mm (in) 64.95064.965 (2.55712.5577)
Measuring point (H) mm (in) 5.0 (0.20)
Piston clearance mm (in) 0.0350.065 (0.00140.0026)
Piston pin boss bore mm (in) 15.97415.985 (0.62890.6293)
Oversize piston diameter
1st mm (in) 65.20065.215 (2.56692.5675)
2nd mm (in) 65.45065.465 (2.57682.5774)
Piston pins
Outside diameter mm (in) 15.96515.970 (0.62850.6287)
Piston rings
Top ring
Dimension B mm (in) 1.171.19 (0.04610.0469)
Dimension T mm (in) 2.302.50 (0.09050.0984)
End gap mm (in) 0.150.30 (0.00590.0118)
Side clearance mm (in) 0.020.06 (0.00080.0024)
(*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.

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