What four wheeler has the most horsepower?

The Kawasaki KFX1400R is a four-wheeler that has the most horsepower. It has a 998cc, 4-stroke, liquid-cooled, DOHC, 4-valve, single-cylinder engine that produces 138.2 horsepower at 8,500 rpm and 111.3 lb-ft of torque at 7,300 rpm. This engine is paired with a 5-speed manual transmission with reverse and a chain final drive. The KFX1400R also has a four-wheel independent suspension with adjustable coil-over shocks, front and rear disc brakes, and 27-inch tires.