Just found this website looking for a new motor, and I thought I would post my bike. Please let me know what you think. It's a cheap 68.5cc engine kit bought off ebay, and an old diamondback frame. It has road tires and a speedo. Took her out for the first time with a speedo earlier today. Top speed hit 45mph before the road ended. Muhahahaha. I'm only around 200mi on the motor, so I don't want to beat on it. I would guess 48-52mph is top speed. Stay posted for the results....