4111 Stroker Crankshaft Yamaha YFZ350 1987 2006

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 0.45 mm - 0.85 mm. +4.00 mm stroker crankshaft increase with +5.00 mm longer rods makes up to 403 cc. Requires Vertex long rod pistons and Vertex gasket kit when using OEM cylinder heads. Kit Includes: • Crankshaft • Connecting Rods • Crankshaft Bearings • Labyrinth Seal.