What would cause the electric starter motor to keep turning after you take your finger off of the button. This is on a bike that doesn't ignite right now, the motor just turns. When it happened earlier today, i hit the kill switch pulled my keys out of the ignition, even yanked the ICU out because i had it exposed and close to me. The battery died before i could disconnect the battery.

Im thinking that all of those would only stop a bike that's running, and aren't directly wired to stop the starter motor. Your finger coming off of the button is supposed to stop it, is there anything other than a button that stuck that would cause this to happen?

Solenoid has stuck, probably burnt contacts that have welded together, it happens 

Unlikely to be related to the start button, that part of the circuit would have isolated as soon as you pulled the keys and dropped the solenoid out.

Replace it and all will be fine, assuming that is the starter motor hasn't run too long, overheated and burnt out.

Yep, I'm with Sledge - starter relay.

You can test it by disconnecting the wires (from the battery, to the starter, and from the starter button), and then jumping the two red wires together. Be prepared for some sparks though...... or get a multimeter and test for continuity.

Could this as a problem have any relation to this guys problem? http://gstwins.com/gsboard/index.php?topic=46028.0 My bikes having identical symptoms. Was going to volt test the wires on my signal generator while the motor was turning to look for a voltage spike every rotation,  to diagnose  it.

Bike was doing as described in link for a couple days, then just wouldnt start period but would turn except it kept turning until battery died as described earlier.

Think it could be related or connected or just coincidence.

Coincidence, the two faults are unrelated. However, if you have been subjecting the bike to numerous start-ups in a relatively short period of time or have been keeping the starter motor running for more than a few seconds at a time this may have contributed to the failure of the solenoid.

Its an old bike, so im not surprised. Is running a volt meter on the signal pulse gen wires while letting the starter turn a reliable way to test that, is there a better alternative?