Maintenance Specifications; Power Unit - Yamaha 25BMH Service Manual

SPEC

MAINTENANCE SPECIFICATIONS

POWER UNIT

Item
CYLINDER HEAD
Warpage limit
(lines indicate straightedge
position)
CYLINDERS
Bore size
Wear limit
Taper limit
Out-of-round limit
PISTON
Piston side "D"
Measuring point "H"
Piston-cylinder clearance
<Limit>
Oversize piston
diameter
Pin boss inside diameter
PISTON PINS
Outside diameter
PISTON RING (1st)
Type
(B)
(T)
End gap
(installed)
<Limit>
Side clearance
<Limit>
MAINTENANCE SPECIFICATIONS
Unit
Worldwide
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
1st mm (in)
2nd mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
25BMH
72.00 - 72.02 (2.8346 - 2.8354)
72.10 (2.8386)
0.08 (0.0031)
0.05 (0.0020)
71.94 - 71.96 (2.8323 - 2.8331)
10.0 (0.3937)
0.060 - 0.065 (0.0024 - 0.0026)
0.1 (0.0039)
72.25 (2.8445)
72.50 (2.8543)
19.904 - 19.915 (0.7836 - 0.7841)
19.895 - 19.900 (0.7833 - 0.7835)
0.20 - 0.35 (0.0079 - 0.0137)
0.55 (0.022)
0.03 - 0.07 (0.001 - 0.003)
0.07 (0.003)
2-3
Model
30HMH
0.1 (0.004)
Keystone
2.0 (0.079)
3.0 (0.118)
E