Need help, tach surges

[Dan]

I have a 2006 that just this morning learned a new trick. As I was pulling out of the driveway my tach jumps from 4.5k to 13k and then bounces back and forth from 0-13k a couple times. It also did this in second gear. The entire time, the motor is running fine, nothing to indicate there is a problem. I pulled over, turned the bike off for a minute then started it back up with no problems.

On the way home from work I noticed that at in 1st and 2nd gear it would surge slightly between 4k-5k but nothin drastic like what I say earlier in the day. The motor never surged, just the tach. Any ideas?

 

[badazgtp]

Alot of times, when the crank position sensor is about to go, it will cause the tach to jump around. I know it does it on cars, but not sure about the bikes.

 

[dadofthree]

 

[MC MUSTANG]

Dan, pull the cluster and reseat the connector; clean it witrh contact cleaner if you have any. Also, off of the ECU there is a tack signal wire - I can't remember if it green or white - check and see if that is shorted at all...

Does it do it at idle at all?

 

[BA BUSA]

Check the connector at the back of the cluster, also check all of your grounds