I rode my 07 Ultra for 7k miles and everything was smooth. While at Myrtle beach with a passenger, I took off from a stop and something went wrong. The engine started to shake ,like engine knock, but as if is was trying to come out of the frame. The two other bikes that were ahead of us heard it and thhought I broke something. I took it to the stealer and he said it was just a little engine knock at startoff BTW, he had previously dyno tuned the bike. I have to be careful when I take off in first gear. If I don't have the revs up high enough it will shake and bang around. If I put it on my trailer, it does it as well. Is this a broken mount or what? Any ideas will be greatly appreciated. I'm going back to the stealer after Myrtle and have him BS me again. It's annoying because I've never heard another one do this.

 

Sounds exactly like a broken mount. It is under warranty so have it checked.

 

My buddy's 07 SG did this with less than a 1000 miles on it. Turned out that the bolt in the front motor mount lost a nut! He just needed it replaced.