Kawasaki Ninja Service Manual: Piston Ring Thickness Inspection

Kawasaki Ninja Service Manual / Crankshaft/Transmission / Pistons / Piston Ring Thickness Inspection

Measure the piston ring thickness.

Use the micrometer to measure at several points around the ring.

Piston Ring Thickness Standard:

Top [A] 0.77 0.79 mm (0.0303
0.0311 in.)

Second [B] 0.78 0.79 mm
(0.0307 0.0311 in.)

Service Limit:

Top 0.70 mm (0.0276 in.)

Second 0.71 mm (0.0280 in.)

Piston Ring Thickness Inspection

If any of the measurements is less than the service limit on either of the rings, replace all the rings.

NOTE

When using new rings in a used piston, check for uneven groove wear. The rings should fit perfectly parallel to the groove sides. If not, replace the piston.

Piston Ring Groove Width Inspection

Measure the piston ring groove width. Use a vernier caliper at several points around the piston. Piston Ring Groove Width Standard: Top [A] 0.82 0.84 mm (0.0323 0.0331 in.) Second [B] 0.8 ...

Piston Ring End Gap Inspection

Place the piston ring [A] inside the cylinder (upper crankcase), using the piston to locate the ring squarely in place. Set it close to the bottom of the cylinder, where cylinder wear is low. ...

Other materials:

Starter Clutch Installation
Replace the O-ring [A] with a new one and apply grease. Apply molybdenum disulfide grease to the starter clutch shaft [B]. Install: Starter Clutch [C] Spacer (Small Diameter) [D] Spacer (Large Diameter) [E] Starter Clutch Shaft Starter Clutch Shaft Holder [F] Turn the O-ring si ...

Air Cleaner
A clogged air cleaner restricts the engine’s air intake, increasing fuel consumption, reducing engine power, and causing spark plug fouling. This motorcycle’s air cleaner element consists of a wet paper filter, which cannot be cleaned. The air cleaner element must be replaced in acco ...

Engine Oil Change
Situate the motorcycle so that it is vertical after warming up the engine. Remove the engine oil drain bolt [A] to drain the oil. The oil in the oil filter can be drained by removing the filter (see Oil Filter Replacement). Replace the drain bolt gasket [B] with a new one. Tighten t ...