Hot Rods Heavy Duty Stroker ATV Crankshaft Assembly (+5mm - 727cc) for Yamaha YFM700R Raptor 4178 All new assembly sold complete with Hot Rods connecting rod Factory assembled and trued to OEM specifications, Hot Rods cranks will meet or surpass the OEM in performance Ready for installation Crankshaft is completely rebuildable with genuine Hot Rods connecting rods Stroker crankshaft assembly add 1.5mm to 5mm of stroke depending on application; in some cases cylinder head must be modified or special pistons used (as noted)