250GP replaced with four-stroke 625-650cc inline-fours

Dorna unveiled its proposal for a four-stroke replacement for the 250GP class today. If it gets its way, 250cc two-strokes will be replaced by four-strokes of between 625 and 650cc in 2011.The capacity was chosen to protect World Supersport racing. With the aim of keeping costs down, further rules dictate the new engines will be inline-fours,