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Buy YamahaYZF R125 workshop manual here
Quick test for the Pick up coil on the YZF R125
test between the white wire and the pink at the solder connections of pick up coil this will test coil
it should be between
Results should be
ill then do the same test but at the wiring connector block results should be the same or very similar and will let you know wiring is correct to connector .
if the pick up coil is faulty buy a new or used one from here
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