Yamaha F30A, Service Manual

Page: 42 / 285

SPEC
Specification
2-15
67C3K11
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
F30AEHT F30AET F40BWHT F40BET