Maintenance Specifications; Power Unit - Yamaha F2.5A Service Manual

SPEC

Maintenance specifications

Power unit

Item
Power unit
Minimum compression
pressure*
Cylinder head
Warpage limit
(lines indicate straightedge
position)
Cylinder
Bore size
Taper limit
Out-of-round limit
Piston
Piston diameter (D)
Measuring point (H)
Piston-to-cylinder clearance
Piston pin boss bore
Piston pin
Outside diameter
Piston rings
Top ring
Dimension B
Dimension T
End gap
Side clearance
2nd ring
Dimension B
Dimension T
End gap
Side clearance
* Measuring conditions:
Ambient temperature 20 °C (68 °F), wide open throttle, with spark plug removed from cylinder.
The figures are for reference only.
2-3
Specifications
Unit
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)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
2
, psi)
54.000–54.015 (2.1260–2.1266)
53.950–53.965 (2.1240–2.1246)
0.035–0.065 (0.0014–0.0026)
12.009–12.017 (0.4728–0.4731)
11.996–12.000 (0.4723–0.4724)
0.97–0.99 (0.0382–0.0390)
1.95–2.15 (0.0768–0.0846)
0.15–0.30 (0.0059–0.0118)
0.04–0.08 (0.0016–0.0031)
1.17–1.19 (0.0461–0.0468)
2.30–2.50 (0.0906–0.0984)
0.30–0.45 (0.0118–0.0177)
0.02–0.06 (0.0008–0.0024)
Model
F2.5AMH
700 (7.0, 102)
0.1 (0.004)
0.08 (0.0031)
0.05 (0.0020)
0 (0)
2
69M3E11