Kawasaki Ninja Service Manual: Piston Wear Inspection

Kawasaki Ninja Service Manual / Crankshaft/Transmission / Pistons / Piston Wear Inspection

Measure the outside diameter [A] of each piston 5 mm (0.20 in.) [B] up from the bottom of the piston at a right angle to the direction of the piston pin.

If the measurement is under service limit, replace the piston.

Piston Wear Inspection

Piston Diameter

Standard: 75.959 75.974 mm
(2.9905 2.9911 in.)
Service Limit: 75.81 mm (2.985 in.)

Cylinder (Upper Crankcase) Wear Inspection

Split the crankcase (see Crankcase Splitting). Remove the pistons (see Piston Removal). Assemble the cylinder (upper crankcase) [A], the cylinder head [B] and the cylinder head gasket [C]. ...

Piston Ring, Piston Ring Groove Wear Inspection

Check for uneven groove wear by inspecting the ring seating. The rings should fit perfectly parallel to groove surfaces. If not, replace the piston and all the piston rings. With the pist ...

Other materials:

Oil Pump Drive Gear Shaft Installation
Apply molybdenum disulfide grease [A] to the oil pump drive gear shaft. Apply molybdenum disulfide oil solution to the followings. Transmission Case [B] Crankcase [C] Install the oil pump drive gear shaft and washer [D] as shown in the figure. Install the new circlip [E] into the ...

Spark Plug Replacement
Remove the stick coils (see Stick Coil Removal in the Electrical System chapter). Remove the spark plugs using the 16 mm (0.63 in.) plug wrench [A] vertically. Replace the spark plug with new ones. Standard Spark Plug Type: NGK CR9EIA-9 Insert the spark plug vertically into the sp ...

Spring Plate Free Play Measurement
Insufficient clutch free play will cause the engine braking effect to be more sudden, resulting in rear wheel hop. On the other hand, if the free play is excessive, the clutch lever may feel “spongy” or pulsate when pulled. Hold an extra drive shaft in a vise and install the following c ...