It appears you're interested in specifications for the BamX BX400-U4 Sierra. This ATV model is powered by a Single cylinder, four-stroke engine with 387.00 ccm (23.61 cubic inches) of actual displacement before 9.5:1 compression. Fueling is metered via Carburettor allowing this machine to produce its 19.00 HP (13.9 kW) horsepower and 25.00 Nm (2.5 kgf-m or 18.4 ft.lbs) torque. According to our records engine heat of the BamX BX400-U4 Sierra is moderated by Oil & air. You'll need to get familiar with the Automatic transmission and pay attention to final drive Shaft drive (cardan) maintainence. Our best information shows that the front tire size is 25/8-12 and the rear is 25/10-12 . 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 Double disc front brakes and Single disc rear brakes. The BamX BX400-U4 Sierra was launched in 2012, 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.