Yamaha WR250F(N) Owner's Service Manual page 626

THROTTLE POSITION SENSOR SYSTEM
6. Adjust:
Throttle position sensor coil resistance
at idle speed
Adjustment steps:
Adjust the angle of the throttle position sen-
sor 1 to obtain the resistance calculated
(example: 650 ~ 750
Tester (+) lead
Tester (–) lead
7. Tighten:
Screw (throttle position sensor) 1
NOTE:
Tighten the screws (throttle position sensor)
using the T20 bit (tamper resistant fastener
type).
8. Install:
Throttle position sensor coupler
THROTTLE POSITION SENSOR INPUT
VOLTAGE INSPECTION
1. Disconnect the throttle position sensor
coupler.
2. Start the engine.
3. Inspect:
Throttle position sensor input voltage
Out of specification
unit.
Tester (+) lead
Tester (–) lead
Throttle posi-
tion sensor
input voltage
4 ~ 6 V
6 - 10
–
ELEC
)
Yellow lead 2
Black lead 3
Replace the CDI
Blue lead 1
Black/Blue lead 2
Tester selector
position
DCV-20
+