Welcome to the site.
I own a yuba bodaboda with about 6500 miles. I've had a geared hub motor on it since about 1500 miles. Since it doesn't engage the chain, no undue wear happens to other parts. I bought my power wheel at ebikeling.com .
I wore out the power wheel at about 4500 miles, threw it away, and installed another I had bought previously. Took about 2 afternoons. Had to remount the controller since the old one was under the seat and the cables to the new one required it to be <3 feet from the motor. I have the motor on the front to maintain the 8 speed sprocket the bodaboda came with. Rear hub motors only allow a 7 speed sprocket.
My brake pads last about 3000 miles, my chain lasts 5000. I bought a park chain gauge, and when it was delivered my chain was at 100% wear. Took me longer to put the chain on than the new hub motor. Had to make some tools since the ones I owned weren't adequate and it takes 4-5 days to get something shipped from California. I own a chain stretcher for phelps-dodge bicycle (industrial) chain, and it was too wide for 8 speed chain. Neither of my bike parts suppliers search came up with any tool answering to the description "chain stretcher". So I made something out of a snap ring tool.
