I have that same vibration at around 75 MPH as soon as I hit 80 - 85 the vibration is gone again. It has to be the belt.
Speaking of top speed, I just so happened to see how fast I could go yesterday and I only got to 101 MPH on the 2014 RT Ltd and acceleration from around 90 - 95 MPH dropped off and it took a bit to creep up to 101 MPH and the RPM was right around 5,000.
I cannot image the 2014 Triple on the RT is going too much faster than 100 MPH.
I spoke with the tech from can-am at the recent spyderfest about ECU programming. He told me the RT is tuned to deliver all it's performance below 6k and the timing really retards after that to limit it's top speeds. He stated that there is no practical speed advantage to shifting above 6K and the auto tranny really prefers shifting south of 4k.
I tried to run 2nd gear to the rev limiter in my 2015 RT and could not find one before I stopped just short of 9K.
I tried for top speed and was surprised how sleepy it got around 90mph. I figured down hill with a tail wind the 1330 RT might be good for 110 mph. Or until the windshield pops off in my face. Not sure which would happen first
All of that information is amazing to me. Can't imagine taking my bike that fast now. But when I was younger it would have been so cool. I recently had what I think was belt slap. Had my 14 rt with the trailer and riding 2 up at 77-79 mph. It would go away when I would back off. Hadn't heard the noise before.
I have gotten my 2012 RTS Beast up to 105 so far. Couldn't keep going cuz I couldn't see around a turn to see if there were any BLUE LIGHTs ahead. Guess I got some work ahead of me to see what the top speed is.