Power Unit Technical Data; Power Unit - Yamaha F25 Service Manual

SPEC
Item
Fuel pump
Holding pressure
Inlet positive pressure
Inlet negative pressure
Outlet positive pressure
Carburetor
Float height
Valve seat size
Main jet (MJ)
Main air jet (MAJ)
Main nozzle (MN)
Pilot jet (PJ)
Pilot air jet (PAJ)
Starter jet (SJ)
Prime Start plunger length

Power unit technical data

Power unit

Item
Cylinder
Minimum compression
pressure (*1)
Engine oil
Oil pressure (*2)
at 60 °C (140 °F) with SL
10W-30 engine oil and at
950 r/min
Thermostat
Valve opening temperature
Fully open temperature
Fully open stroke
Item
Cylinder
Minimum compression
pressure (*1)
1-13
Specification
Unit
kPa
(kgf/cm
psi)
kPa
(kgf/cm
psi)
kPa
(kgf/cm
psi)
mm (in)
mm (in)
mm (in)
mm (in)
Unit
kPa
(kgf/cm
psi)
kPa
(kgf/cm
psi)
°C (°F)
°C (°F)
mm (in)
Unit
kPa
(kgf/cm
psi)
F25EA
2
,
2
,
2
,
14.0 ± 2.0 (0.55 ± 0.08)
F25MHA
2
, 750.0 (7.50, 108.8)
2
, 250.0 (2.50, 36.3)
58.0–62.0 (136–144)
F25EA
2
, 870.0 (8.70, 126.2)
Model
F25A
50.0 (0.50, 7.3)
30.0 (0.30, 4.4)
50.0 (0.50, 7.3)
1.2 (0.05)
#108
#70
2.6 (0.10)
#45
#85
#62
10.7 (0.42)
Model
F25EHA
870.0 (8.70, 126.2)
70.0 (158)
3.0 (0.12)
Model
F25A
T25A
T25A