Yamaha YZ250N Owner's Service Manual page 516

TPS (THROTTLE POSITION SENSOR) SYSTEM
7. Adjust:
9Idle speed for TPS adjustment
Adjustment steps:
9Set
the inductive
tachometer) to the high tension cord.
9Turn the throttle stop screw 1 until the
specified idle speed.
Refer to "IDLE SPEED ADJUSTMENT" sec-
tion in the CHAPTER 3.
Idle speed for TPS adjustment:
1,700~1,900 rpm
8. Disconnect the TPS coupler.
9. Calculate:
9TPS coil resistance at idle speed.
TPS coil resistance at idle speed:
TPS coil resistance × (0.13~0.15)
<Example>
If the TPS coil resistance is 5kΩ, then the TPS
coil resistance at idle speed is:
5kΩ × (0.13~0.15) = 650~750Ω
Refer to "TPS COIL INSPECTION" section
about the TPS coil resistance.
10. Adjust:
9TPS coil resistance at idle speed
Adjustment steps:
Adjust the angle of the TPS 1 to obtain the
resistance calculated (example: 650~750Ω).
Tester (+) lead Yellow lead 2
Tester (–) lead
6-11
ELEC
tachometer (engine
Black lead 3