It appears you're interested in specifications for the Yamaha XJ 400 Seca. This Naked bike model is powered by a Four cylinder boxer, four-stroke engine with 398.00 ccm (24.29 cubic inches) of actual displacement before 9.7:1 compression. Fueling is metered via Carburettor. 2x34 Mikuni allowing this machine to produce its 45.00 HP (32.8 kW) horsepower and 33.90 Nm (3.5 kgf-m or 25.0 ft.lbs) torque. According to our records engine heat of the Yamaha XJ 400 Seca is moderated by Air. You'll need to get familiar with the 6-speed transmission and pay attention to final drive Chain maintainence. Our best information shows that the front tire size is -19 and the rear is 110/90-18 . 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. 1 Piston Caliper front brakes and Expanding brake (drum brake) rear brakes. The Yamaha XJ 400 Seca was launched in 1981, 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.