For the record, I know of a fault that can occur with the stock speedo gauge, and how to correct it. I found this fault and cure when I was testing the speedo instrument in the lab during the development of the Yellow Box.
If the speedo gets bad pulses, like very fast pulses from a "crackly" bad connection, it can jump right up the scale. If the bike is then turned off the speedo needle can "hang" and often resets itself to THE WRONG SPOT! This is very scary, from that point on your speedo will not work at all and keeps resetting to a very high speed, probably past the end of the dial in no-mans land.
The problem is caused by the stepper motor and computer in the gauge. When you turn the bike off it is supposed to reset to the correct zero position.
Anyway, to fix the problem, set the bike up on a SECURE rear stand and gently take it up to redline in 6th gear obviously with the rear wheel in the air. Get a friend to hold the bike/stand down for safety!!
Once the speedo has been taken high enough and the wheel gently brought back to a standstill it will then reset normally and work normally.
I have heard people spend hundreds of $ on a new speedo cluster (combination meter) when all they needed was to reset it properly.
If you can't remember all this, just remember if your speedo starts resetting to some weird position when you turn the bike off, the "Yellow Box" guy can help you fix it. I'm usually around the bike forums somewhere.
Yellow Box at:
http://centauri.ezy.net.au/~fastvid/
[This message has been edited by 99TLR (edited 09 June 2000).]