The Yamaha TT-R90 can reach a top speed of approximately 40 mph without any modifications. The exact speed will vary due to many other factors, such as the weight of the rider, tire inflation, terrain type and wind speed and direction.
The Yamaha TT-R90's single cylinder, 4-stroke engine has a capacity of 90cc and is air-cooled. The Yamaha TT-R90 was manufactured from 2000 to 2007. All models feature a simple electric starter, an automatic three-speed clutch, and a low seat height, making the TT-R90 suitable for use by children ages 7 to 10. The TT-R90 also features a throttle stop that can be used by parents to restrict speed.