by Hubert Carpet » Wed Jun 05, 2019 1:22 pm
Usually, the pickup is a reed switch that is normally open and is closed momentarily each time the magnet passes by. The distance between the switch and the magnet can be adjusted by the number of turns you screw the pickup into the brake caliper.
The switches are pretty fragile and can be damaged when you fit or remove them. They can also randomly pack up.
You can test by unplugging the lead and using a meter or continuity tester. Pass a magnet by the switch or spin the front wheel and check that the circuit is made each time the magnet passes by. Conversely, you can do a quick test on the speedo by briefly shorting across the pickup lead and watching the speedo reading. Not very scientific but will confirm that the speedo is not dead.
If the spare part price for the pickup is too high you can often find them on eBay as plain reed switches.
2020 200RR.
2014 300RR. Gone but not forgotten.