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:

Balance Adjustment
If the wheel always stops in one position, provisionally attach a balance weight [A] on the rim at the marking using adhesive tape. Rotate the wheel 1/4 turn [B], and see whether or not the wheel stops in this position. If it does, the correct balance weight is being used. If the whe ...

Oil Pump Installation
Install the outer rotor [A] into the crankcase. Assemble: Oil (Water) Pump Shaft [B] Pin [C] Inner Rotor [D] To prevent dropping, apply grease to the pin. Install the inner rotor assembly into the crankcase. Fit the slot [E] onto the projection [F]. Replace the O-ring [A ...

KIBS Hydraulic Unit Terminal Names
1. Ground: BK 2. CAN Communication Line (High): GY/BL 3. Front Wheel Rotation Sensor Signal Input: Y 4. Power Supply: BR/W 5. KIBS Kawasaki Self-Daignosis System Terminal: P 6. Front and Rear Brake Light Switch Signal: BL/R 7. Unused 8. Front Wheel Rotation Sensor Signal Output: G/Y 9. P ...