Well today I did the solid motor mount mod. Everything seems to have went okay but now there is a very small vibration from about 1500 - 1800rpm'*. Is this normal or did I do something wrong? You can just feel the vibration through the pedal. Riding shotgun you can't feel a thing.

Some have felt some vibration. There have been discussions on it, including this one, about halfway down the current index for this section.
http://www.bonnevilleclub.com/forum/...ic.php?t=81507

It'* normal, soon enough, you won't even realize you feel it

Personally, I like the feeling.

Consider it normal and that is the only downside to the solid mount. You might be able to lessen it with some rubber to dampen..