125cc Dirt Bikes Yamaha

TT-R 125cc 4 stroke Dirt Bike?

Hi, I wondered at what speed (mph) you think a Yamaha TT-R 125cc 4 stroke Dirt Bike with me would regard. I weigh 160 pounds Model Type: http://www.yamaha-motor.com/sport/products/modelspecs/237/1/specs.aspx

Most people think they are is much faster than they really are. could get up to 40 or so if you're lucky. I have a 250cc dirt bike oriented race and I could get up 65.

Yamaha 125 TT-r