Yamaha f80a Service Manual page 22

SPEC
Item
Stem diameter
Intake
Exhaust
Guide inside diameter
Intake and exhaust
Stem-to-guide clearance
Intake
Exhaust
Stem runout limit
VALVE SPRINGS
Free length
Minimum free length
Tilt limit
VALVE LIFTERS
Valve lifter outside diameter
Valve-lifter-to-cylinder-head
clearance
VALVE PADS
Valve pad thickness
(in 0.025 mm increments)
PISTONS
Piston-to-cylinder clearance
Measuring point (D)
Measuring point (H)
Pin boss inside
diameter
Oversize piston diameter
PISTON PINS
Outside diameter
PISTON RINGS
Top ring
Dimension B
Dimension T
End gap
Side clearance
2nd ring
Dimension B
Dimension T
End gap
Side clearance
Oil ring
Dimension B
Dimension T
End gap
Side clearance
MAINTENANCE SPECIFICATIONS
Unit
mm (in) 5.975 ~ 5.990 (0.2352 ~ 0.2358)
mm (in) 5.960 ~ 5.975 (0.2346 ~ 0.2352)
mm (in) 6.005 ~ 6.018 (0.2364 ~ 0.2369)
mm (in) 0.015 ~ 0.043 (0.0006 ~ 0.0017)
mm (in) 0.030 ~ 0.058 (0.0012 ~ 0.0023)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in) 27.965 ~ 27.980 (1.1010 ~ 1.1016)
mm (in) 0.020 ~ 0.056 (0.0008 ~ 0.0022)
mm (in) 2.000 ~ 3.300 (0.0787 ~ 0.1299)
mm (in) 0.070 ~ 0.080 (0.0028 ~ 0.0031)
mm (in) 78.928 ~ 78.949 (3.1074 ~ 3.1082)
mm (in)
mm (in) 18.008 ~ 18.015 (0.7090 ~ 0.7093)
mm (in)
mm (in) 17.997 ~ 18.000 (0.7085 ~ 0.7087)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
– 5 –
Model
F80
0.03 (0.001)
53.20 (2.094)
52.25 (2.057)
2.6 (0.10)
13 (0.51)
79.25 (3.120)
1.17 ~ 1.19 (0.046 ~ 0.047)
2.89 ~ 2.91 (0.114 ~ 0.115)
0.15 ~ 0.30 (0.006 ~ 0.012)
0.02 ~ 0.08 (0.001 ~ 0.003)
1.47 ~ 1.49 (0.058 ~ 0.059)
3.00 ~ 3.20 (0.118 ~ 0.126)
0.70 ~ 0.90 (0.028 ~ 0.035)
0.03 ~ 0.07 (0.001 ~ 0.003)
2.38 ~ 2.48 (0.094 ~ 0.098)
2.40 (0.094)
0.20 ~ 0.70 (0.008 ~ 0.028)
0.03 ~ 0.15 (0.001 ~ 0.006)
E
F100