Max Biaggi, Ben Spies, and Tom Sykes have graced us with some sounds of the new Yamaha R1 (1000cc cross-plane engine) and Aprilia RSV4 (1000cc V4 engine) taking a few laps at the Portimao circuit in Portugal. Click the jump to see the two videos.

 

Yamaha R1:

Aprilia RSV4:

Source: MCN

Is 2009 here yet?