The 2007 Yamaha YZF-R1 marked a return to Yamaha's traditional four-valve setup, replacing the five-valve configuration that consisted of three intake valves and two exhaust valves. The bike ...

The Exped R1 is a summer rated air mat with longitudinal baffles that’s proven to be a great size for overall usability and comfort. There are two valves (1 in, 1 out), and it takes less than 4 ...