2001 Yamaha YFM660 Raptor Factory Service Manual, Page 248Get this manual
CRANKCASE
3.Fit the right crankcase onto the left crankcaseTap lightly on the case with soft hammer
CAUTION:
Before installing and torquing the crankcase holding bolts, be sure to check whether the transmission is functioning properly by manually rotating the shift cam in both directions
4.Install: Lead guides Hose guide Crankcase bolts 5.Tighten: Crankcase bolts (follow the proper tightening sequence)