Yamaha WR450F(V) Owner's Service Manual page 736

SIGNALING SYSTEM
3. Measure:
• Speed sensor output voltage
Output voltage not correct → Replace the
speed sensor.
Measurement steps:
• Elevate the front wheel and slowly rotate
it.
• Measure the voltage (DCV) of white lead
and black lead. With each full rotation of
the front wheel, the voltage reading should
cycle from 0.6 V to 4.8 V to 0.6 V to 4.8 V.
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