Motorcycle Review: 2004 Yamaha R1

The power delivery was very linear, and due to its oversquare bore, very revvy. The compression ration is higher, from 11.8:1 to 12.4:1 and both exhaust and intakes are larger with tighter valve angles. Those valves are also shorter and lighter as are the piston’s and the consequent redline is 2,000rpm more than last years model, now set at 13750.