2003-2006 Kawasaki KFX400 service manual, Page 103Get this manual
FINAL SEAT CUT 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 wide, use the 15 or 30 cutter to lower and narrow it to the correct width After the desired seat position and width is achieved, use the 60 cutter very lightly to clean up any burrs caused by the previous cutting operations
Contact area too low and too narrow on face of valve