Handling Note; Checking The Throttle Position Sensor Coil; Changing And Adjusting The Throttle Position Sensor - Yamaha YZ125 2022 Owner's Service Manual

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HANDLING NOTE

ECA27120
NOTICE
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.
1
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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.
• Positive tester probe 
Blue "1"
• Negative tester probe 
Black "2"
Throttle position sensor coil re-
sistance
4–6 k
1
2
3. Check:
• Throttle position sensor coil variable resis-
tance
Check that the resistance in increased as the
lever "a" is moved from the full close position
to the full open position.
1 1 1
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CHANGING AND ADJUSTING THE
THROTTLE POSITION SENSOR
1. Remove:
1
2. Remove:
2
TIP
Loosen the throttle position sensor screw using
the T25 bit.
8-11
ELECTRICAL COMPONENTS
Out of specification  Replace.
• Positive tester probe 
Yellow "1"
• Negative tester probe 
Black "2"
Throttle position sensor coil vari-
able resistance
Full closed
0–2 k
Full opened
4–6 k
1
2
a
1
2
a
• Carburetor
• Mixing chamber top
Refer to "CARBURETOR" on page 7-3.
• Throttle position sensor screw "1"
• Throttle position sensor "2"
1
2
1
2