According to a report in mxlarge.com (run by our friend Bernd Dietrich), Aprilia will likely debut a Yamaha-engined motocrosser displacing 450cc later this year as a 2004 model. As we have discussed before, Aprilia has a history with off-road motorcycles, and Aprilia chairman Ivano Beggio has expressed an interest in pursuing the dirt bike market. Indeed, there had been earlier speculation that Aprilia would acquire a smaller dirt bike manufacturer such as Husqvarna, but it now appears Aprilia will develop a line of dirt bikes in-house.