Yamaha WR250F 2008 Owner's And Service Manual page 218

Measure the output voltage accurate-
ly with a digital electronic voltmeter
that gives an easy reading of a small
voltage.
Throttle po-
Tester se-
sition sen-
lector posi-
sor output
voltage
0.58–0.78 V
10. Put the aligning marks "a" on the
throttle position sensor and car-
buretor.
11. Stop the engine.
12. Remove the carburetor.
13. Tighten:
• Screw (throttle position sensor)
"1"
Tighten the screw (throttle position
sensor) using the T25 bit.
14. Install the carburetor.
CHECKING THE THROTTLE
POSITION SENSOR INPUT
VOLTAGE
1. Disconnect the throttle position
sensor coupler.
2. Start the engine.
3. Inspect:
• Throttle position sensor input volt-
age
Out of specification→Replace the
CDI unit.
THROTTLE POSITION SENSOR SYSTEM
Tester (+) lead → Blue lead "1"
Tester (-) lead → Black/Blue lead
"2"
Throttle po-
sition sen-
tion
DCV
Tester se-
lector posi-
sor input
tion
voltage
4–6 V DCV-20
7-17