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AMA to Combine Daytona Sportbike and Supersport Classes in 2015

AMA Pro Racing announced plans to combine its Daytona Sportbike and Supersport classes into a single category by the 2015 season. The two classes currently share many similarities including engine displacement regulations, minimum weight limits and eligible machines. The Supersport class has more restrictions on modifications and are limited to a maximum top speed of 165 mph while Daytona Sportbike machines are allowed to reach speeds up to 170 mph.

2012 Yamaha YZ250F Announced

Yamaha revealed its 2012 YZ250F motocross bike with a number of updates. The 2012 Yamaha YZ250F gets several engine refinements including a new 39mm carburetor, compared to the 2011 version’s 37mm carb. The piston and piston pin are said to be lighter, while the connecting rod and counterbalancer are also new.

MotoGP Lifts Rookie Rule, Caps Factory Prototype Entries and Adjusts Other Regulations

As expected, MotoGP organizers have officially lifted the rule barring rookies from racing for factory teams, but the Grand Prix Commission also tweaked some other regulations including a cap on factory prototype machines. We’ve discussed the lifting of the rookie rule already, with the main impetus being to allow a manufacturer such as Honda to sign up-and-coming Moto2 star Marc Marquez when he is expected to move up to the premiere class next season. As of Jan.