As I was driving into work this morning. I noticed my tachometer was acting strangely. I was in 5th gear at a speed of 55mph. At this speed in this gear the tach usually reads between 4000 and 5000 rpm, but today it was reading 4000 rpm, then 9000 rpm, then 10000 rpm, then 5000 rpm, then pegging out past 10000 rpm to some unknown rpm. All of this jumping around took place in about 2 seconds. For reference my bike, a 2001 750 Honda Nighthawk, red lines at 8500 rpm.
Fortunately for me, the engine was running at a constant speed, and not matching the tachometer. I hate to even imagine what would have happened to my engine if it was running over 10000 rpm for any length of time.