Motorcycle Questions? Ask a Mechanic.
I'd 1st check that the driveshaft isn't out of alignment. So check that the U-Joints are properly aligned, as they have to line up with each other or it will vibrate some
if thats OK then check that the wheels are correctly balanced and one other thing to check for which isn't covered by a balance check is out of round or bent wheels, if you use a dial gauge on the axle to measure the run out on the wheel rim this will ensure that the wheels are round and true
Ok yes but there are a pair of driveshafts running to each wheel?
unless you have the live axle version of the trike but that should be an earlier year