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Okay, have the speed sensor back apart. A couple of questions:
1. The parts schematic says the inner hub is part number 21192, but I can't find any hub that looks like this one using that part number. They are all black and have much more prominent tangs. As you can see, this one appears pretty worn.
2. Is there supposed to be anything in the hole at the top of the speed sensor hub? You can see the sort of square hole inside the hub at the top in the picture.
3. Don't mind replacing the sensor magnet, but at $35 or so, I don't want to spend it if the speed sensor hub is broken.
You can get the correct parts diagram for your model year here (what I provided was for a '13, yours looks a bit different):
Okay, have the speed sensor back apart. A couple of questions:
1. The parts schematic says the inner hub is part number 21192, but I can't find any hub that looks like this one using that part number. They are all black and have much more prominent tangs. As you can see, this one appears pretty worn.
2. Is there supposed to be anything in the hole at the top of the speed sensor hub? You can see the sort of square hole inside the hub at the top in the picture.
3. Don't mind replacing the sensor magnet, but at $35 or so, I don't want to spend it if the speed sensor hub is broken.
That hole at the top is where one of the tangs on the hub engages. There should be another 180 across from it. That's how the sensor rotates and produces a signal for the speedo. Spin that and see if the speed works. If it doesn't you need to page 16-75 in the service manual and run the diagnostic flow chart to find out where the fault is.
Installed the new sensor and it works correctly now.
Only question left is how the part worked when I was test riding the bike and for the first weeks after I got it home. No way it should have worked at all.
2018 Klx250s. I have 2. Now the second one has a failing speedo although I believe that's a failed magnet/speed sensor as the speed reading is going haywire
