Speedometer discrepancy

[SpudRider]

Originally Posted by Mudflap

Some electronic speedos can be recalibrated simply by putting them in set-up mode and punching in the correct wheel diameter. May take a 16 year old to figure out how to do it though. Could be as simple as holding down both buttons while turning the key on, but probably not.

I have tried starting the bike while holding down each individual button, and both buttons. Unfortunately, none of these attempts put the speedometer into calibration mode.

Originally Posted by Weldangrind

Interesting. Does that mean the speedometer unit is not connected to the Siemens CPU?

I'm sure the speedometer is connected to the Siemens microprocessor. However, the Siemens VDO Speedometers sold in the United States have one button, and are set up to enter configuration mode as described by Mudflap. The details of the configuration mode for the U.S. units are provided in the two documents I have linked below.

http://www.nsifleet.com/pdf/ProgrammableSpeedometer.pdf

http://www.springfieldstreetrod.com/...ionsSpeedo.htm