Hi Bikeguy Joe,
I don't know how thier bike worked out, but we get calls almost every day about replacing the Hoot boxes with our new drive. The majority of the calls are about the gear versions, however we are starting to get a lot more calls about the chain primary versions.
I thought the double chain had a better chance of working longer, but we still hear about major chain stretch and the chain hitting the case inside.
Many have told us the single row chain version stretches and then rips the teeth off the front pulley.
Owners of the latest double chain version have reported, chain hitting case, badly worn front sprocket, and several have told us something about the rear sprocket assembly binding up. I think there might be some kind of "freewheel" assembly the sprocket is attached to that is not working correctly.
We are currently working on a special adapter to fit the short tapered shaft on the motor.
We are also hearing the ratios are off and the motor is turning very high RPMs with minimum top end.
I think a few have managed to keep them working, but from all that I have read they had to do a lot of maintenance to get good results.
Have fun,