Yamaha F25A - Page 48

2-7
SPEC
E
MAINTENANCE SPECIFICATIONS
IGNITION CONTROL SYSTEM
Oil pressure switch kPa (kg/cm
2
, psi) 15.5 (0.16, 2.25)
Power bobbin (Y/B – Y/B)
loaded
@ cranking 1* V 7
@1,500 r/min V 30
@3,500 r/min V 80
open circuit
@ cranking 2* V 10
@1,500 r/min V 40
@3,500 r/min V 80
Electrothermal valve coil
resistance (Y/B – Y/B)
Ω 6.7 ~ 7.1
Engine temperature sensor
resistance
@ 5 ˚C (41 ˚F) kΩ 2.5
@ 20 ˚C (68 ˚F) kΩ 1.25
@ 70 ˚C (158 ˚F) kΩ 0.176
Engine speed limiter
Retard timing r/min 6,200 ± 80
Ignition off r/min 6,300 ± 80
Reset r/min 6,000 ± 80
Overheat speed control r/min 2,000 ~ 3,000
STARTING SYSTEM
Fuse A 20
STARTER MOTOR
Type Bendix
Rating Second 30
Output kW 1.1
Brush length limit mm (in) 6.4 (0.25)
Commutator undercut mm (in) 0.8 (0.03)
CHARGING SYSTEM
Lighting coil output peak voltage
(Y – Y)
loaded
@ cranking 1* V 10
@1,500 r/min V 25
@3,500 r/min V 65
open circuit
@ cranking 2* V 10
@1,500 r/min V 25
@3,500 r/min V 60
Item Unit
Model
Worldwide F20A F25A
USA, CANADA — F25X
* Cranking 1: Open circuit
Cranking 2: Related parts are connected.