Yamaha FT25B Manual De Servicio página 196

– +
ELEC
ENRICHMENT CONTROL SYSTEM
8080
8090
ENRICHMENT CONTROL SYSTEM
CHECKING THE POWER COIL
Measure:
• Power coil output peak voltage
Below specification → Replace the
power coil.
Output peak voltage
Yellow/black (Y/B) –
Yellow/black (Y/B)
Cranking
r/min
Unloaded Loaded
D.C. V 15
Peak voltage adaptor
YU-39991 / 90890-03169
Power coil resistance
(reference data)
Yellow/black (Y/B) –
Yellow/black (Y/B)
6.7 - 7.1 Ω at 20 ˚C (68 ˚F)
CHECKING THE ELECTROTHERMAL
RAM
1. Measure:
• Electrothermal ram resistance
Out of specification → Replace.
Electrothermal ram resistance
Yellow (Y) – Yellow (Y)
16 - 24 Ω at 20 ˚C (68 ˚F)
2. Measure:
• Electrothermal ram projection length
a
Out of specification → Replace.
Measuring steps
(1) Connect a 12-V battery to the electro-
thermal ram.
(2) Measure the length of the projection
after applying power for five minutes.
Electrothermal ram projection
maximum length ...................... a
14 - 15 mm (0.55 - 0.59 in)
– 86 –
E
1,500 3,500
6 25 66
8
8
8