Yamaha F90D - Page 18

6D81G11
2-4
1
2
3
4
5
6
7
8
9
Oil ring
Dimension B mm (in) 2.38–2.48 (0.0937–0.0976)
Dimension T
(*)
mm (in) 2.40 (0.0945)
End gap mm (in) 0.20–0.70 (0.0079–0.0276)
Side clearance mm (in) 0.03–0.15 (0.0012–0.0059)
Camshafts
Intake (A) mm (in) 36.48–36.58 (1.4362–1.4402)
Exhaust (A) mm (in) 36.90–37.06 (1.4528–1.4591)
Intake (B) mm (in) 29.95–30.05 (1.1791–1.1831)
Exhaust (B) mm (in) 29.92–30.08 (1.1780–1.1842)
Camshaft journal diameter mm (in) 24.960–24.980 (0.9827–0.9835)
Camshaft runout limit mm (in) 0.03 (0.0012)
Valves
Valve clearance (cold)
Intake mm (in) 0.20
±
0.03 (0.008
±
0.001)
Exhaust mm (in) 0.34
±
0.03 (0.013
±
0.001)
Head diameter (A)
Intake mm (in) 29.0–29.2 (1.14–1.15)
Exhaust mm (in) 24.0–24.2 (0.94–0.95)
Face width (B)
Intake mm (in) 1.99–2.44 (0.0783–0.0961)
Exhaust mm (in) 2.27–2.72 (0.0894–0.1071)
Seat contact width (C)
Intake mm (in) 1.20–1.60 (0.0472–0.0630)
Exhaust mm (in) 1.20–1.60 (0.0472–0.0630)
Margin thickness (D)
Intake mm (in) 0.80–1.20 (0.0315–0.0472)
Exhaust mm (in) 1.00–1.40 (0.0394–0.0551)
Stem diameter
Intake mm (in) 5.975–5.990 (0.2352–0.2358)
Exhaust mm (in) 5.960–5.975 (0.2346–0.2352)
Guide inside diameter
Intake and exhaust mm (in) 6.000–6.018 (0.2362–0.2369)
Stem-to-guide clearance
Intake mm (in) 0.010–0.043 (0.0004–0.0017)
Exhaust mm (in) 0.025–0.058 (0.0010–0.0023)
Stem runout limit mm (in) 0.01 (0.0004)
Valve springs
Free length mm (in) 53.20 (2.0945)
Tilt limit mm (in) 2.6 (0.10)
(*)
The figure is for reference only.
Item Unit
Model
F90TR
Maintenance specification