ABF,
The entire sidecar weighs either 62 or 68 lbs.(I forget which).
Of course any additional weight will effect acceleration. The bike That I have it on is 50cc single speed. I changed the rear sprocket from 44T to 50T to get extra torque for the sidecar. Of course I lost top end but I'm no speed demon anyway.
I stuck with the 50cc just for the round fin look. The max load that I put into it is 80 lbs(grandaughter). Goes fine but have to help it up the hills.
It only takes about 2 minutes to connect/ disconnect the car from the bike. I have much stronger engines that would work better but I'm happy the way it is.