2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 163Get this manual
1D-21 Engine Mechanical: Hold each piston ring and put it into the cylinderMake sure that the piston rings are caught by the cylinder skirtNOTE When mounting the cylinder, keep the camshaft drive chain tautThe camshaft drive chain must not be caught between the cam drive chain sprocket and crankcase when the crankshaft is rotated Place the cylinder head (3) on the cylinderNOTE When installing the cylinder head (3), keep the cam chain taut I933H1140080-01
NOTE Apply engine oil to the threaded parts of the cylinder head bolts and both sides of the its washers Be sure to install the washer with rounded side facing up