Yamaha F15B, Service Manual

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Maintenance specifications
Item Unit
Model
F15BMH F15BM
2 nd ring
Dimension B mm (in) 1.47–1.49 (0.0579–0.0590)
Dimension T mm (in) 2.50–2.70 (0.0984–0.1063)
End gap mm (in) 0.30–0.50 (0.0118–0.0197)
Side clearance mm (in) 0.02–0.04 (0.0008–0.0016)
Over size
1 st mm (in) 59.25 (2.33)
2 nd mm (in) 59.50 (2.34)
Oil ring
Dimension B mm (in) 2.31–2.51 (0.0909–0.0988)
Dimension T mm (in) 2.30–2.60 (0.0906–0.1024)
End gap mm (in) 0.20–0.70 (0.0079–0.0276)
Side clearance mm (in) 0–0.22 (0–0.0087)
Over size
1 st mm (in) 59.25 (2.33)
2 nd mm (in) 59.50 (2.34)
Camshaft
Intake (A) mm (in) 27.596–27.696 (1.0865–1.0904)
Exhaust (A) mm (in) 27.616–27.716 (1.0872–1.0912)
Intake and (B) mm (in) 23.950–24.050 (0.9429–0.9468)
exhaust
Camshaft journal diameter
mm (in) 34.935–34.955 (1.3754–1.3762)
Camshaft journal oil clearance mm (in) 0.050–0.080 (0.0020–0.0032)
Camshaft run-out limit mm (in) 0.03 (0.0012)
Rocker arm shafts
Outside diameter mm (in) 12.941–12.951 (0.5095–0.5099)
Rocker arms
Inside diameter mm (in) 13.000–13.018 (0.5118–0.5125)
Valves
Valve clearance (cold)
Intake mm (in) 0.15–0.25 (0.0059–0.0098)
Exhaust mm (in) 0.20–0.30 (0.0079–0.0118)
Head diameter (A)
Intake mm (in) 27.9–28.1 (1.10–1.11)
Exhaust mm (in) 21.9–22.1 (0.86–0.87)
Face width (B)
Intake and mm (in) 1.98–3.11 (0.0780–0.1224)
exhaust
Seat contact width (C)
Intake and mm (in) 0.60–0.80 (0.0236–0.0315)
exhaust
Margin thickness (D)
Intake and mm (in) 0.50–0.90 (0.0197–0.0354)
exhaust
6D45F11-02 03.10.9 20:42 Page 5