HOT RODS Crankshaft Assembly - Stroker - Yamaha 4149

Crankshaft Assembly - Stroker - Yamaha 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.