2004-2009 Suzuki LT-Z250 Service Manual, Page 101Get this manual

2004-2009 Suzuki LT-Z250 Service Manual, Page 101

Install the oil sump filter as its projection faces upward CRANKCASE Wipe the crankcase mating surfaces (both surfaces)
with cleaning solventFit the dowel pins onto the left half on the crankcaseApply engine oil to the conrod big end and gears