Vibration

2014 Thunderbird Lt noticable vibration coming from the engine around 2500 rpm, up through handlebars. On a long ride, my hands start to feel numb. Any ideas or thoughts?

 

loose motor mounts?

 

Everything is tight, thanks though

 

I think this motor design has a balance shaft, could this be an internal engine issue with the balance shaft?

 

What about cylinder balance - maybe they need balancing ?

 

Thanks for all the info...this only happens around 2500-3000 rpms. I guess there is going to have to be some vibration, it is a big twin. I have just read that some guys say how smooth the lt and commander are.