The latest models of motocross bikes, which will serve members of the world championships in 1990, have very powerful engines.
The machine Honda, Yamaha, Kawasaki and Suzuki engines power a 125 cm-1 lies in the range 38 39 m. s./28 29 kW, 53 Class 250 cm3 55.6 liters. C/39 41 kW and 500 SML 64 65 l. C/47 48 kW.