It appears you're interested in specifications for the Yamaha SR 400. This Naked bike model is powered by a Single cylinder, four-stroke engine with 399.00 ccm (24.35 cubic inches) of actual displacement before 8.5:1 compression. Fueling is metered via Carburettor allowing this machine to produce its 27.00 HP (19.7 kW) horsepower and 29.00 Nm (3.0 kgf-m or 21.4 ft.lbs) torque. According to our records engine heat of the Yamaha SR 400 is moderated by Air. You'll need to get familiar with the 5-speed transmission and pay attention to final drive Chain maintainence. Our best information shows that the front tire size is 90/100-18 54S and the rear is 110/90-18 61S . The entire package is supported by the frame, . We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Single disc front brakes and Expanding brake rear brakes. The Yamaha SR 400 was launched in 2002, and we're happy to know (or assume) you've got one in your garage. To help you keep your ride in tip-top shape, consider purchasing an owner or service manual.