Yamaha F30A, Service Manual

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67C3K11
2-8
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Rocker arm shaft
Outside diameter mm (in) 15.971–15.991 (0.6288–0.6296)
Rocker arm
Inside diameter mm (in) 16.000–16.018 (0.6299–0.6306)
Valve
Valve clearance (cold)
Intake mm (in) 0.20
±
0.05 (0.008
±
0.002)
Exhaust mm (in) 0.30
±
0.05 (0.012
±
0.002)
Head diameter (A)
Intake mm (in) 31.9–32.1 (1.256–1.264)
Exhaust mm (in) 25.9–26.1 (1.020–1.028)
Face width (B)
Intake mm (in) 1.84–2.97 (0.0724–0.1169)
Exhaust mm (in) 1.98–3.11 (0.0780–0.1224)
Seat contact width (C)
Intake and exhaust mm (in) 0.9–1.1 (0.035–0.043)
Margin thickness (D)
Intake mm (in) 0.6–1.0 (0.024–0.039)
Exhaust mm (in) 0.7–1.1 (0.028–0.043)
Stem diameter
Intake mm (in) 5.475–5.490 (0.2156–0.2161)
Exhaust mm (in) 5.460–5.475 (0.2150–0.2156)
Stem runout limit
Intake mm (in) 0.030 (0.0012)
Exhaust mm (in) 0.016 (0.0006)
Guide inside diameter
Intake and exhaust mm (in) 5.500–5.512 (0.2165–0.2170)
Stem-to-guide clearance
Intake mm (in) 0.010–0.037 (0.0004–0.0015)
Exhaust mm (in) 0.025–0.052 (0.0010–0.0020)
Valve spring
Free length mm (in) 39.85 (1.5689)
Tilt limit mm (in) 1.7 (0.067)
Cylinder
Bore size mm (in) 64.985–65.015 (2.5585–2.5596)
Item Unit
Model
F30AMHD F40BMHD F40BWHD F40BED
Maintenance specification