With the move to Moto3, there will be no more two-stroke World Championship races. The 2012 season will see four-stroke machines across MotoGP, Moto2 and Moto3.As for specs, the 250cc motors in Moto3 will have a maximum bore of 81 mm. Each engine should last for three races minimum and cost not more than €12000 ($18,500 USD). Also, each chassis manufacturer if required should be ready to supply a minimum of 15 riders.In 2012, Moto3 will join Moto2, which debuted this year. In Moto2, 600cc 4-stroke Honda spec engines replaced the 250cc two-stroke race bikes.