Page 27 of Kawasaki ATVs by Kawasaki USA

ENGINE The ATV industries first V-twin receives its first substantial revisions in 2006 for the use in the Brute Force 650 4x4i. The new, liquid-cooled, 633 cm 3, SOHC, 4-valve V-twin engine is more powerful than many competitors largest machines, churning out a substantial 46 PS 7,500 rpm. Torque output 51.4 N m 5,500 rpm lets the KVF650F accelerate with ease. All new, high flow cylinder heads are based on the mighty the Brute Force 750 4x4i but feature a combustion chamber matched to the 650s 9.9:1 compression ratio. New, KVF750 style, all-aluminum cylinders feature electrofusion-coated bores for light weight, long wear and excellent heat dispersion. The electrofusion bores save 1.5 pounds of engine weight compared to the iron liner cylinders of the other KVF650 models. Other than jetting changes, the large bore, dual CVKR-34 mm, down-draft carburetors are lifted straight from the KVF750. Oriented for best flow into the straight intake tract, they deliver high intake efficiency and gutsy power across the rpm range. Primer feature ensures easy starts no matter how cold the weather. The four valve heads use large, 30 mm intake and 26 mm exhaust valves. Efficient, SOHC (Single OverHead Cam) design operates forked rocker arms with screw type lash adjusters for ease of maintenance. Vacuum-operated petcock automatically shuts off fuel flow when the engine is not running. Offsetting the cylinders by 90 results in perfect primary balance, for low vibration levels and comfortable riding. Its so smooth theres no need for a separate extra engine balancer, saving power and weight. Oversquare bore and stroke measure 80 x 63 mm (85 x 66 mm for the 750). Pistons and con rods are common with the other KVF650 models. New aluminum exhaust pipe and muffler covers are lighter than previous steel components.

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