Kawasaki STX-15F service manual Valve Seat Inspection, Valve Seat Repair

6-26 ENGINE TOP END

Valves

Valve Seat Inspection

•Remove the valve (see Valve Removal).

•Check the valve seating surface [A] between the valve [B] and valve seat [C].

○Measure the outside diameter [D] of the seating pattern on the valve seat.

If the outside diameter is too large or too small, repair the seat (see Valve Seat Repair).

Valve Seating Surface Outside Diameter

Standard:

Exhaust	27.6 ∼	27.8 mm (1.087 ∼	1.094 in.)
Inlet	32.6 ∼	32.8 mm (1.283 ∼	1.291 in.)

○Measure the seat width [E] of the portion where there is no build-up carbon (white portion) of the valve seat with a vernier caliper.

Good [F]

If the width is too wide [G], too narrow [H] or uneven [J], repair the seat (see Valve Seat Repair).

Valve Seating Surface Width

Standard:

Exhaust	0.8 ∼	1.2 mm (0.03 ∼	0.047 in.)
Inlet	0.5 ∼	1.0 mm (0.02 ∼	0.039 in.)

Valve Seat Repair

•Repair the valve seat with the valve seat cutters [A].

Special Tools-	Valve Seat Cutter Holder,	5:
	57001-1208 [B]

Valve Seat Cutter Holder Bar: 57001-1128 [C]

[For Inlet Valve Seat]

Valve Seat Cutter, 45° - 35: 57001-1116

Valve Seat Cutter, 32° - 35: 57001-1121

Valve Seat Cutter, 55° - 35: 57001-1247

[For Exhaust Valve Seat]

Valve Seat Cutter, 45° - 30: 57001-1187

Valve Seat Cutter, 32° - 30: 57001-1120

Valve Seat Cutter, 60° - 30: 57001-1123

If the manufacturer’s instructions are not available, use the following procedure.