Yamaha F25 Service Manual page 34

Item
Valve spring
Free length
Tilt
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
Unit
F25EA
mm (in)
mm (in)
mm (in) 30.839–30.939 (1.2141–1.2181)
mm (in) 30.937–31.037 (1.2180–1.2219)
mm (in) 25.950–26.050 (1.0217–1.0256)
mm (in) 36.925–36.945 (1.4537–1.4545)
mm (in) 36.935–36.955 (1.4541–1.4549)
mm (in) 37.000–37.025 (1.4567–1.4577)
mm (in)
mm (in) 15.971–15.991 (0.6288–0.6296)
mm (in) 16.000–16.018 (0.6299–0.6306)
0.20 ± 0.05 (0.008 ± 0.002)
mm (in)
0.30 ± 0.05 (0.012 ± 0.002)
mm (in)
mm (in) 31.900–32.100 (1.2559–1.2638)
mm (in) 26.600–26.800 (1.0472–1.0551)
mm (in) 1.200–1.600 (0.0472–0.0630)
mm (in) 0.800–1.200 (0.0315–0.0472)
mm (in) 1.000–1.400 (0.0394–0.0551)
Power unit technical data
Model
F25A T25A
39.9 (1.57)
1.7 (0.07)
0.030 (0.0012)
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