Yamaha F15B, Service Manual

Page: 20 / 180

SPEC
2-5 6D45F11
Specifications
Item Unit
Model
F15BMH F15BM
Stem diameter
Intake mm (in) 5.475–5.490 (0.2156–0.2161)
Exhaust mm (in) 5.460–5.475 (0.2150–0.2156)
Guide inside diameter
Intake and exhaust mm (in) 5.500–5.512 (0.2165–0.2170)
Stem-to-guide clearance
Intake and exhaust mm (in) 0.025–0.052 (0.0010–0.0020)
Stem run-out limit mm (in) 0.01 (0.0004)
Valve springs
Free length mm (in) 34.40 (1.3543)
Minimum free length mm (in) 32.68 (1.2866)
Tilt limit mm (in) 1.5 (0.06)
Connecting rods
Small-end inside diameter mm (in) 14.015–14.029 (0.5518–0.5523)
Big-end inside diameter mm (in) 31.030–31.042 (1.2217–1.2221)
Crankpin oil clearance mm (in) 0.021–0.045 (0.0008–0.0018)
Crankshaft
Crankshaft journal diameter mm (in) 34.997–35.009 (1.3778–1.3783)
Crankpin diameter mm (in) 30.997–31.009 (1.2204–1.2208)
Crankpin width mm (in) 21.000–21.070 (0.8268–0.8295)
Run-out limit mm (in) 0.05 (0.0020)
Big end side clearance mm (in) 0.050–0.220 (0.0020–0.0087)
Crankcase
Crankshaft main journal oil mm (in) 0.012–0.045 (0.0005–0.0018)
clearance
Upper and lower crankcase
main journal bearing thickness
A - (Blue) mm (in) 1.494–1.498 (0.0588–0.0590)
B - (Black) mm (in) 1.498–1.502 (0.0590–0.0591)
C - (Brown) mm (in) 1.502–1.506 (0.0591–0.0593)
Oil pump
Type Trochoid
Outer rotor-to-housing mm (in) 0.100–0.150 (0.0039–0.0059)
clearance (A)
Outer rotor-to-inner rotor
mm (in) 0.040–0.140 (0.0016–0.0055)
clearance (B)
Rotor-to-cover clearance (C)
mm (in) 0.030–0.090 (0.0012–0.0035)
Discharge L (US gal, 5.70 (1.506, 1.254)
lmp gal)/min
Relief valve opening pressure kPa 388.0–450.0
(kgf/cm 2 , psi) (3.88–4.50, 56.3–65.3)
6D45F11-02 03.10.9 20:42 Page 6