This is what kits are in the main.Or what about just a conversation kit for pedal Asist
You can get a super motorbike for £1000, forget mopeds go for an nice little 250cc, there are hundreds out there. Much safer and legal.What the most basic conversion kit my budget is 1000
For £500, you can get a kit which will just about do 20mph on the flat with the wind behind you. Average speed with normal pedalling would be 12 -14 mph., and 8 - 10 mph mph on hills.Also I will I be able to use my hydrolic brake
Do woosh do 29er wheel hub motorsI'd suggest you contact someone like whoosh, who will help you choose a suitable ebike kit for your bike. The back up service and help you will get will save you not only money in the long run, but help with technical issues also.