Yamaha YZF-R125 Service Manual: Checking the lean angle sensor

1. Remove:

  • Lean angle sensor

2. Check:

Lean angle sensor output voltage Out of specification Replace.


a. Connect the lean angle sensor to the wire harness.

b. Connect the pocket tester (DC 20 V) to the lean angle sensor coupler as shown.


Positive tester probe
yellow/green "1"

Negative tester probe
gray/black "2"

Checking the lean angle sensor


c. Set the main switch to "ON".

d. Tilt the lean angle sensor to 65.

e. Measure the lean angle sensor output voltage.

    Checking the crankshaft position sensor
    1. Disconnect: Crankshaft position sensor coupler (from the wire harness) 2. Check: Crankshaft position sensor resistance Out of specification  Replace the crankshaft position senso ...

    Checking the starter motor operation
    1. Check: Starter motor operation Does not operate → Perform the electric starting system troubleshooting, starting with step 4. Refer to "TROUBLESHOOTING" on page 8-9. a. Con ...

    Other materials:

    Checking the primary driven gear
    1. Check: Primary driven gear "1" Damage/wear Replace the primary drive gear and clutch housing as a set. Excessive noise during operation  Replace the primary drive gear and clutch housing as a set. ...

    Installing the piston and cylinder
    1. Install: Top ring "1" 2nd ring "2" Oil ring expander "3" Lower oil ring rail "4" Upper oil ring rail "5" NOTE: Be sure to install the piston rings so that the manufacturer marks or numbers face up. 2. Install: Piston "1" Piston pin "2" Piston pin clips "3" NOTE: ...

    Installing the cylinder head
    1. Install: Cylinder head NOTE: Pass the timing chain through the timing chain cavity. 2. Tighten: Cylinder head bolts "1" Cylinder head bolts "2" NOTE: Lubricate the cylinder head bolts and washers with engine oil. Tighten the cylinder head bolts in the proper tighten ...

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