I put a speedometer on my bike today and got it up to about 26mph. It's not broken in yet, but when I bought the kit it said I'd get top speeds of around 30 to 35 mph. Does anyone know if this lack of speed is due to the engine not being broke in yet? I'm starting to wonder if I was sent a 50cc rather than the 70cc I thought I was buying. How do I know for sure?