Yamaha F40B - Fuel System

SPEC
Specification
2-17 67C3K11
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
F30AEHT F30AET F40BWHT F40BET
Carburetor
ID mark
(For Europe) — 69H22 — 67C23
(For Oceania) 69H02 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)
Item Unit
Model
F30AEHT F30AET F40BWHT F40BET