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
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