Tusk Crankcase Splitter/Separator The Tusk crankcase splitter is a must for disassembling vertically split 2- and 4-stroke crankcases. It 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. Both 8mm and 6mm mounting bolts are included.