I installed a Bafang BBS02 750 watt motor on my Baccehetta recumbent bike. I have the controller set at 18 amps with nine settings using a 48 volt battery. Max speed is 40mph thats as high as I can spin the petals. I ride between 140 and 150 miles a week. On flat ground I use a setting of 20% ( think around 145 watts) ridding at speeds of 21+ mph. At 4700 miles I serviced the motor by disassembling the motor and greasing everything. I found one thrust bearing on the pedal crank shaft had come apart and had to be replaced I never felt any problem or roughness before disassembly. I now have 8800 miles on the motor without any problems ( I did have battery problems but that's another story ). I plan to disassembly the motor at 10,000 miles and do another service. At the present time I don't have a throttle on the bike but when I did I only used it starting up and or when crossing highways. The unit is a little heavy but who cares only notice weight when loading the bike. I don't have the best hearing at my age but I have never heard the motor run. With the price you can purchase the Bafang BBS02 I think it would be hard to beat.