Maintenance Specification; Power Unit - Yamaha F25C Service Manual

SPEC

Maintenance specification

Power unit

Item
Power unit
Minimum compression
(*1)
pressure
Lubrication oil pressure
Cylinder heads
Warpage limit
(lines indicate straightedge
position)
Cylinder head journal inside
diameter
Cylinders
Bore size
Taper limit
Out-of-round limit
Pistons
Piston diameter (D)
Measuring point (H)
Piston-to-cylinder clearance
Piston pin boss bore
Oversize piston diameter
1st
2nd
Piston pins
Outside diameter
(*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.
• Since this outboard motor is equipped with an automatic decompression mechanism, accurate data may
be difficult to obtain due to differences in the way the starer rope is pulled.
(*2)
The figures are for reference only.
2-3
Specifications
Unit
kPa
(kgf/cm
(*2)
kPa
(kgf/cm
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
F25CMH
2
, psi)
80 (0.8, 11) at engine idle speed
2
, psi)
37.000–37.025 (1.4567–1.4577)
65.000–65.015 (2.5590–2.5596)
64.950–64.965 (2.5571–2.5577)
0.035–0.065 (0.0014–0.0026)
15.974–15.985 (0.6289–0.6293)
65.200–65.215 (2.5669–2.5675)
65.450–65.465 (2.5768–2.5774)
15.965–15.970 (0.6285–0.6287)
Model
F25CM
810 (8.1, 115)
0.10 (0.0039)
0.08 (0.0032)
0.05 (0.0020)
2.0 (0.08)
2
6D55F11