2003 Kawasaki KLF250 Service Manual., Page 87Get this manual
4-28 ENGINE TOP END Valves, Guides, Seats, Springs, Oil Seals
Widened Width [A] of engagement by machining with 45 cutter Ground Volume [B] by 32 cutter 32 [C] Correct Width [D] Ground Volume [E] by 60 cutter 60 [F]
Measure the outside diameter of the seating surface with vernier caliperIf the outside diameter of the seating surface is too small, repeat the 45 grind [A] until the diameter is within the specified rangeOriginal Seating Surface [B]
Remove all pittings of flaws from 45 ground surfaceAfter grinding with 45 cutter, apply thin coat of machinist's dye to seating surfaceThis makes seating surface distinct and 32 and 60 grinding operation easierWhen the valve guide is replaced, be sure to grind with 45 cutter for centering and good contactIf the outside diameter [A] of the seating surface is too large, make the 32 grind described belowIf the outside diameter of the seating surface is within the specified range, measure the seat width as described belowGrind the seat at 32 angle [B] until the seat outside diameter is within the specified rangeTo make the 32 grind, fit 32 cutter into the holder, and slide it into the valve guideTurn the holder one turn at time while pressing down very lightlyCheck the seat after each turn