4186 Stroker Crankshaft Kawasaki KFX450R 2x4 2008 2014

Features: Factory assembled and trued to OEM specifications. Drop in replacement crankshaft requires no modification unless noted . CNC machined and dynamically balanced to suit the increased stroke. Add +2.00 mm to +4.00 mm of stroke depending on application. Uses stock piston unless noted. Main bearings not included . Can be matched with Cylinder Works Big Bore cylinders to get significant displacement and horsepower gains. Not re-buildable as the rods are shorter than OEM.. Connecting rod side clearance is 0.40 mm - 0.80 mm +3.00 mm stroke increase makes 471 cc. Uses stock piston..