I’m also replacing the main bearing shells, so I’ve pressed them into place in the top crankcase half and oiled them with fresh engine oil before carefully lowering the crankshaft into position. The new camchain is also in position on the crankshaft. Incidentally, if only replacing the camchain on one of these engines it is possible to remove the camshaft, then turn the engine over, remove the bottom crankcase half and split the big end caps. This lets you lift out the crankshaft without disturbing the head, barrels and pistons