2007-2010 Kawasaki Ultra 250X/260X/260LX PWC Factory Service Manual, Page 229Get this manual
ENGINE TOP END 6-31 Valves
Measure the outside diameter of the seating surface with vernier caliperIf the outside diameter of the seating surface is too smallrepeat the 45 grind until the diameter is within the specified range Widened Width [A] of engagement by machining with 45 cutter Ground Volume [6] by 32 cutter 32 [C] Correct Width [0] Ground Volume [E] by 60 or 55 cutter 60 or 55 [F] Measure the outside diameter of the seating surface with vernier caliperIf the outside diameter of the seating surface is too smallrepeat the 45 grind [A] until the diameter is within the specified rangeOriginal Seating Surface [6]
O Remove all pittings of flaws from 45 ground surfaceOAfter grinding with 45 cutter, apply thin coat of machinist's dye to seating surfaceThis makes seating surface distinct and 32 and 60 grinding operation easiero When the valve guide is replaced, be sure to grind with 45 cutter for centering and good contact If the outside diameter [A] of the seating surface is too largemake the 32 grind described belowIf the outside diameter of the seating surface is within the specified rangemeasure the seat width as described below Grind the seat at 32 angle [6] until the seat 0.0 is within the specified range OTo make the 32 grindfit 32 cutter into the holder, and slide it into the valve guide OTurn the holder one turn at time while pressing down very lightlyCheck the seat after each turnG[ 50 12 SI C