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Meeting this weekend, the GP Commission confirmed the demise of two-stroke GP racing as they finalized plans to start the Moto3 series in 2012. Replacing the 125GP racing class, Moto3 will center around 250cc singe-cylinder four-stroke motor with a maximum bore size of 81mm. The class will be open to multiple engine manufacturers, who will have to make their motors available for €10,000 or less.

Two-stroke GP racing is expected to die next year, and the announcement of the Moto3 class is expected to occur during the GP Commission’s meeting at the Czech GP in a couple days. Scheduled to meet on Friday, the GP Commission has been hammering out the details on the 250cc single-cylinder four-stroke racing class that will replace 125GP in 2012, and will likely make an announcement after Sunday’s race.

Similar in concept to the Moto2 class, the most notable difference is the rumor that the Moto3 class will not be a spec-motor series, meaning any manufacturer can build a thumper and compete in the series. Considering the large number of manufacturers that already have experience racing 250cc singles, we can expect an array of bikes to be on the grid in 2012.

After the GP Commission convened at Assen to meet regarding rules for the 2011 season, and other GP affairs, talk quickly began to spread that rumors of a Moto3 class were true. Seeing the success of Moto2 in replacing 250GP, the GP Commission seems to think that a similar race series could successfully replace the 125GP class, making all of GP racing a four-stroke affair as early as 2012 or 2013.

In a somewhat bizzare move, the GP Commission is set to discuss the possibility of bringing 1000cc race bikes to MotoGP a year earlier than previously agreed upon. A proposal set to be put forth on Friday by IRTA President and Tech3 Yamaha boss Herve Poncharal would allow for 1000cc motorcycles to race in MotoGP in 2011 rather than in 2012 as was planned because of the alleged need to fill the grid from its current 17 bike total.

The GP Commission (FIM, Dorna, IRTA & MSMA) met this week to discuss and further refine the rules that will be implemented in the 2012 MotoGP season, namely the return to the 1,000cc format. The new rules lock in the amount of gas a bike can carry, as well as other details pertinent to GP racing, but the rule everyone is talking about is the 1,000cc switch. Interestingly enough, the 2010 rules allow for motors “up to 1000cc”, but provide different bike weight for bikes under and over 800cc. Check out the details after the jump.