NEW OEM BRP Rotax Engine. 2016+ ATV 850 Vtwin 78 horsepower@ 7300 RPM, 94mm bore, 61.5mm stroke, 10.5:1 compression ratio. The 850 will have the larger valves when compared to the 800R, these were first seen in the 2013 1000R maverick engine, these are 36.5mm and 31mm respectively. This is new, not rebuilt. It will ship as pictured. No electronics included, you will need to transfer over your parts. Shipped with signature required.