Yamaha WR250F(R), Owner'S Service Manual

Page: 96 / 860

MAINTENANCE SPECIFICATIONS
2 - 17
SPEC
EC212300
ELECTRICAL
Item Standard Limit
Ignition system:
Advancer type Electrical ----
CDI:
Pickup coil resistance (color) 248 ~ 372
Ω
at 20 °C (68 °F)
(White – Red)
----
CDI unit-model/manufacturer 5UM-00/YAMAHA (For USA) ----
5UM-10/YAMAHA (Except for USA) ----
Ignition coil:
Model/manufacturer 5UL-00/DENSO ----
Minimum spark gap 6 mm (0.24 in) ----
Primary coil resistance 0.08 ~ 0.10
Ω
at 20 °C (68 °F) ----
Secondary coil resistance 4.6 ~ 6.8 k
Ω
at 20 °C (68 °F) ----
Charging system:
System type AC magneto ----
Model/manufacturer 5UM-00/YAMAHA ----
Normal output 14 V/120 W at 5,000 r/min ----
Charging coil resistance (color) 0.288 ~ 0.432
Ω
at 20 °C (68 °F)
(White – Ground)
----
Lighting coil resistance (color) 0.224 ~ 0.336
Ω
at 20 °C (68 °F)
(Yellow – Ground)
----
Rectifier/regulator:
Regulator type Semiconductor short circuit ----
Model/manufacture SH712AA/SHINDENGEN ----
Regulated voltage (AC) 13.0 ~ 14.0 V ----
Regulated voltage (DC) 14.1 ~ 14.9 V ----
Rectifier capacity (AC) 12 A ----
Rectifier capacity (DC) 8 A ----
Electric starting system:
Type Constant mesh ----
Starter motor:
Model/manufacturer 5UM00/YAMAHA ----
Operation voltage 12 V ----
Output 0.35 kW ----
Armature coil resistance 0.0189 ~ 0.0231
Ω
at 20 °C (68 °F) ----
Brush overall length 7 mm (0.28 in) 3.5 mm (0.14 in)
Brush quantity 2 pcs. ----
Spring force 3.92 ~ 5.88 N
(400 ~ 600 g, 14.1 ~ 21.2 oz) ----
Commutator diameter 17.6 mm (0.69 in) 16.6 mm (0.65 in)
Mica undercut (depth) 1.5 mm (0.06 in) ----