2007 Arctic Cat Four-Stroke Factory Service Manual, Page 98Get this manual
6Rotate the engine to the upside down position for installing the crankshaft and counterbalancers! NOTE: It is advisable to install cap screw and large washer to the cylinder head cap screw hole between pistons to avoid any chance of the pistons sliding out of the cylinder 8With the proper bearings selected, install the half-bearings into the upper engine case; then lubricate the bearing faces liberally with engineassembling grease taking care not to get any grease between the engine case and bearing! NOTE: Make sure the tabs of the bearings are properly seated to the notches in the upper engine case
7With new O-ring, install the piston cooling jets with Allen-head cap screws; then tighten to specifications
! CAUTION
Prior to lubricating the bearings and journals, make sure all surfaces are cleaned thoroughly and dried with compressed air to avoid contaminants between the bearings and shaft surface