29 Bad bike.
A. Go to the "Introduce yourself" area in the forum and introduce yourself.
B. I just added that same sprocket on my bike. Do a search on this forum for "Very bad vibration". Mine almost got rid of the vibration completely. I think yours is just a matter of chain vs sprocket. The chain you need is a 415 size. Not the 41 size you normally get with a normal bike.
The small "engine driven sprocket" should also be a 415. Of course it would help if you were to tell us what kind of bike, what kind of motor you have. I would have found that out in the "introduce yourself" section, right? lol.
I'm just playing with you, man. This is a great forum, and people here are A)awesome and B) very willing to help.
I'm form the St. Augustine area, myself. I'm stationed in New Orleans right now, but I go to FL every few months to just to maintain my sanity. Where are you in FL?