Vibration

#1
Have a 3.5 Briggs mounted on a DB 30.
I have a pretty good vibration. Engine seems to run smooth and the shaft looks strait. The gas tank is pushed up on the fender frame , very tight.
Think the tanks adds to the vibration? Anyone use dampers of any kind?
Suggestions?
 
#2
There is always dampers on mini bikes, three of them, 2 tires and a seat.

Post a pic of what you have and we can go from there, pics are worth a thousand words.
 
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