Kawasaki Ninja Service Manual: Valve Seat Inspection

Kawasaki Ninja Service Manual / Engine Top End / Valves / Valve Seat Inspection

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 23.9 24.1 mm (0.941
0.949 in.)


Intake 30.4 30.6 mm (1.197
1.205 in.)


Valve Seat Inspection


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
0.05 in.)


Intake 0.5 1.0 mm (0.02
0.04 in.)


Valve-to-Guide Clearance Measurement (Wobble Method)
If a small bore gauge is not available, inspect the valve guide wear by measuring the valve to valve guide clearance with the wobble method as indicated below. Insert a new valve [A] into the gu ...

Valve Seat Repair
Repair the valve seat with the valve seat cutters [A]. Special Tools - Valve Seat Cutter Holder Bar [B]: 57001 -1128 Valve Seat Cutter Holder, 4.5 [C]: 57001 -1330 [For Exhaust Valve Seat] V ...

Other materials:

Radiator Hose and O-ring Replacement
Drain the coolant (see Coolant Change). Remove: Upper Fairing Assembly (see Upper Fairing Assembly Removal in the Frame chapter) Thermostat Housing [A] (see Thermostat Removal in the Cooling System chapter) Oil Cooler [B] (see Oil Cooler Removal in the Engine Lubrication System chap ...

Front Wheel Removal
Remove: Front Caliper Mounting Bolts [A] (Both Sides) Front Caliper [B] (Both Sides) Loosen: Front Axle Clamp Bolts [A] (Right Side) Front Axle [B] Remove the lower fairings (see Lower Fairing Removal in the Frame chapter). Raise the front wheel off the ground. ...

Power Mode Indicator
This indicator shows the selected Power Mode. For more detailed information about the power mode, see power mode section in the How to Ride the Motorcycle chapter. A. Power Mode Indicator NOTE When all power mode indicators go off, the battery voltage is insufficient. Have the machine ...