Yamaha YZ250F(V) Owner's Service Manual page 620

THROTTLE POSITION SENSOR SYSTEM
5. Install:
• Carburetor
• Throttle position sensor coupler
6. Adjust:
• Engine idling speed
Refer to "ENGINE IDLING SPEED
ADJUSTMENT" section in the CHAPTER
3.
7. Insert the thin electric conductors 2 (lead)
into the throttle position sensor coupler 1,
as shown, and connect the tester to them.
Tester (+) lead → Yellow lead 3
Tester (–) lead → Black lead 4
CAUTION:
• Do not insert the electric conductors
more than required because it may
reduce the waterproof function of the
coupler.
• Make sure that a short-circuit does not
develop between the terminals because it
may cause damage to electrical compo-
nents.
8. Start the engine.
9. Adjust:
• Throttle position sensor output voltage
Adjustment steps:
Adjust the installation angle of the throttle
position sensor 1 to obtain the specified
output voltage.
NOTE:
Measure the output voltage accurately with
a digital electronic voltmeter that gives an
easy reading of a small voltage.
Throttle posi-
tion sensor out-
put voltage
0.58 ~ 0.78 V
6 - 10
– +
ELEC
Tester selector
position
DCV