Yamaha YZ250 2022, Owner'S Service Manual

Page: 238 / 274

ELECTRICAL COMPONENTS
8-11
EAM30587
HANDLING NOTE
NOTICE
ECA27120
Do not loosen the screw (throttle position
sensor) “1” except when changing the throt-
tle position sensor due to failure because it
will cause a drop in engine performance.
EAM30588
CHECKING THE THROTTLE POSITION
SENSOR COIL
1. Remove:
•
Carburetor
• Mixing chamber top
Refer to “CARBURETOR” on page 7-3.
2. Check:
•
Throttle position sensor coil resistance
Out of specification

Replace.
3. Check:
•
Throttle position sensor coil variable resis-
tance
Check that the resistance in increased as the
lever “1” is moved from the full close position
to the full open position.
Out of specification

Replace.
EAM30589
CHANGING AND ADJUSTING THE
THROTTLE POSITION SENSOR
1. Remove:
•
Carburetor
• Mixing chamber top
Refer to “CARBURETOR” on page 7-3.
2. Remove:
•
Screw (throttle position sensor) “1”
• Throttle position sensor “2”
TIP
Loosen the screw (throttle position sensor) using
the T25 bit.
3. Replace:
•
Throttle position sensor
4. Install:
•
Throttle position sensor “1”
• Screw (throttle position sensor) “2”
• Positive tester probe

Blue “1”
• Negative tester probe

Black “2”
Throttle position sensor coil re-
sistance
4–6 k

• Positive tester probe

Yellow “2”
• Negative tester probe

Black “3”
Throttle position sensor coil vari-
able resistance
Full closed
0–2 k

Full opened
4–6 k
