Crank Case Splitter Atc Motorcycle Dirtbike Atv Motor Engine Puller Crankcase Crankcase splitter/separator tool. A must for disassembling vertically split 2 and 4 stroke crankcases. Makes crankcase disassembly easy by safely pushing the crank assembly out of the case halves. Adjustable arms permit it to be used on a variety of bolt patterns. Includes both 8mm and 6mm mounting bolts.