2003 Suzuki LT-Z400 Factory Service Manual, Page 66Get this manual
CUT FINAL If the contact area is too low or too narrow, use the 60 cutter to raise and widen the contact areaIf the contact area is too high or too use the 15" or 30" cutter to lower and narrow it to the correct widthand width is achieved, use the After the desired seat 60' Gutter to clean up any burrs caused by the previous
Contact area too !ow and too narrow on face of valve