Same hub Sportscarpat uses, huh? Since your throwing my name around make sure they know I use them on 135mm frames and not 110mm, that the offset on the engine side sprocket is not correct for a China bicycle engine unless you offset the engine to the left, and that these hubs also have no provision to mount the cable housing so a custom cable stop will need to be added to the frame. Not a simple bolt-on. The 36 tooth motor side sprocket seems kind of small, too. Good luck turning it with a little 66cc two stroke. One final thought is about the brake actualtion. I only use these hubs on centrifugal clutch equipped motor bikes so it leaves the left side handlebar area clear for the use of the brake lever. If you need a clutch lever where will you put the rear brake lever?
Sportscarpat