i ordered five kits a few weeks ago from ZoomBicycles. i only paid $630.00 flat, free shipping, pretty good deal im guessing. As soon as the motors arrived i look on the box they all say 66.5cc or something like that, i am really confused now. did i get the (china) 66/80cc or the 49cc. i just built a new bike with this motor and it sure seems like its missing power, compared to my other true 80/66cc bikes. but they do say the same cubic centimeters. this motor sucks on any incline too, but im going to break it in first before i tryin figure out whats hold the power back. here is a picture of the bike and motor 2.
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