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Never heard of a self programing speedo unit. Obviously not an HD unit. I can point you in the direction of www.harleytechtalk.org. free to join ask any question you want and you will be answered. This is the best HD site in the world. If you like it, maybe you might consider donating to keep the site going. It's a sponor free site so it runs on donations only from members.
Is the speedo electronic or cable operated? If cable operated there are a number of things to check. Firstly remove speedo cable from back off guage. Remove speedo cable from speedo drive generally front wheel. Check that the inner is still one piece, by spinning. If that is good you need to check if your speedo drive is functional. Screw cable back to drive, lift front wheel and check if cable inner is turning, if it is you may need a new speedo. (spring worn like my old Triumph.
Let's start by taking the battery out and taking it to an automotive part store. Ask them to load test the battery for you. They'll usually do this for no charge. If the battery test good, put it back in the bike and make sure it's charged up fully.
Now, connect a DVOM (digital volt ohm meter) to the battery. Red meter lead to positive, black meter lead to negative. Put the meter function knob on DC Volts, 20 volt or greater range. Start the engine and bring it to a high idle. You should be reading 14.5-14.8 volts across the battery. If not, check the output of your alternator.
Unplug the regulator down at the cases just to the left side of your oil filter. Look down into the connector and you'll see two pins. Put your meter's function knob in AC Volts, 50 volt range. Start the engine and bring it to a high idle. Touch one lead of your meter (either lead) to one pin and the other lead to the other pin. You should be reading thirty volts or more.
If not, you probably need to replace the stator in your alternator, If you read 30 volts or more, replace your regulator.
Now, as to whether or not this will correct your speedo problem, I have absolutely no idea.
Copied from the manual.
You can download it here:
To change to kilometers per hour or miles per hour:
- Disconnect the battery. (the total distance will be saved).
- Re-connect the battery whilst holding down either button and it will
met -- for km/h
mil --- for mp/h
- The white plastic block connector on the speedo is for the display
- The red wire is positve.
- The black wire is negative.
- Warning; your speedo is set for the diameter of your front wheel
If you get the display to read a 00 then you are in the rolling radius
changing mode. you can trim the speed to run fast or slow.
It ranges from a-25 to a 25.
Standard setting is a 00 we recommend you keep it at that.
I have the same speedo but it built into the headlight on my 97 Siz Days 250.
So it is a GasGas part but I do not really know too much about the parts needs to make it work. Although mine was routed to the rear wheel instead of the front so you might want to see if there is a sensor built into your rear hub. You should be able to go with the newer gasgas speedo setup since your on a 02'. Good luck with it.