Yamaha F25 Service Manual page 33

SPEC
Item
Camshaft
Cam lobe height
Intake
Exhaust
Cam lobe width
Intake and exhaust
Journal diameter #1
Journal diameter #2
Cylinder head journal inside
diameter
Runout
Rocker arm shaft
Outside diameter
Rocker arm
Inside diameter
Valve
Clearance
Intake
Exhaust
Head diameter
Intake
Exhaust
Seat contact width
Intake and exhaust
Margin thickness
Intake
Exhaust
Item
Cylinder head
Warpage limit
Valve stem
Diameter
Intake
Exhaust
Runout
Intake and exhaust
Valve guide
Inside diameter
Intake and exhaust
Stem-to-guide clearance
Intake
Exhaust
Installation position
1-15
Specification
Unit
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)
Unit
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Model
F25MHA
30.839–30.939 (1.2141–1.2181)
30.937–31.037 (1.2180–1.2219)
25.950–26.050 (1.0217–1.0256)
36.925–36.945 (1.4537–1.4545)
36.935–36.955 (1.4541–1.4549)
37.000–37.025 (1.4567–1.4577)
0.030 (0.0012)
15.971–15.991 (0.6288–0.6296)
16.000–16.018 (0.6299–0.6306)
0.20 ± 0.05 (0.008 ± 0.002)
0.30 ± 0.05 (0.012 ± 0.002)
31.900–32.100 (1.2559–1.2638)
26.600–26.800 (1.0472–1.0551)
1.200–1.600 (0.0472–0.0630)
0.800–1.200 (0.0315–0.0472)
1.000–1.400 (0.0394–0.0551)
Model
F25EA F25A
0.10 (0.0039)
5.475–5.490 (0.2156–0.2161)
5.460–5.475 (0.2150–0.2156)
0.010 (0.0004)
5.500–5.512 (0.2165–0.2170)
0.010–0.037 (0.0004–0.0015)
0.025–0.052 (0.0010–0.0020)
16.3–16.7 (0.64–0.66)
F25EHA
T25A