The FIM has announced new rules restricting the use of modified Moto2 bikes for testing purposes.
At present, the best-funded Moto2 teams are able to swap the Honda-built control engines, which must be used during a grand prix weekend, for a similar 600cc Supersport powerplant and enjoy extra testing outside of a race weekend.
In order to clamp down on this loophole, teams will in future be banned from testing with Moto2 eligible machines fitted with "engines other than the official Championship engines".
The strict mileage limits on the official Moto2 engines will therefore slash the amount of testing possible. However, the new rule won't come into force until November 8.