Yamaha F40B - Fuel System

67C3K11 2-10
1
2
3
4
5
6
7
8
9
Fuel system
Crankshaft
Crankshaft journal diameter mm (in) 42.984–43.000 (1.6923–1.6929)
Crankpin diameter mm (in) 32.984–33.000 (1.2986–1.2992)
Crankpin width mm (in) 21.000–21.070 (0.8268–0.8295)
Crankshaft runout limit mm (in) 0.05 (0.0020)
Crankcase
Crankshaft journal oil
clearance
(*1)
mm (in) 0.012–0.044 (0.0005–0.0017)
Upper and lower crankcase
main journal bearing thickness
A - (Blue) mm (in) 1.498–1.502 (0.0590–0.0591)
B - (Black) mm (in) 1.494–1.498 (0.0588–0.0590)
C - (Brown) mm (in) 1.490–1.494 (0.0587–0.0588)
Oil pump
Type Trochoid
Relief valve opening pressure kPa
(kgf/cm
2
, psi)
389–451 (3.89–4.51, 56.4–65.4)
Thermostat
Opening temperature
at 0.05 mm (0.0020 in) °C (°F) 58–62 (136–144)
Fully open temperature °C (°F) 70 (158)
Valve open lower limit mm (in) 3.0 (0.12)
Manual starter
Starter rope length mm (in) 1,750 (68.9) —
Starter rope extended length mm (in) 1,400–1,600 (55.12–62.99) —
(*1)
The figures are for reference only.
Item Unit
Model
F30AMHD F40BMHD F40BWHD F40BED
Carburetor
ID mark
(For Europe) 69H22 67C23 — 67C23
(For Oceania) — 67C03 —
Float height mm (in) 12.0–16.0 (0.47–0.63)
Valve seat size mm (in) 1.4 (0.06)
Main jet (M.J.) #88 #95
Main nozzle (M.N.) mm (in) 2.4 (0.09) 2.8 (0.11)
Pilot jet (P.J.)
(For Europe) #40 — #40
(For Oceania) — #38 —
Pilot screw (P.S.) turns out 1 7/8 ±
1/2
2 ± 1/2
Engine idle speed r/min 850 ± 50
Item Unit
Model
F30AMHD F40BMHD F40BWHD F40BED
Maintenance specification