Kawasaki Ninja Owners Manual: Kawasaki Clean Air System

The Kawasaki Clean Air System (KCA) is a secondary air suction system that helps the exhaust gases to burn more completely. When the spent fuel charge is released into the exhaust system, it is still hot enough to burn. The KCA System allows extra air into the exhaust system so that the spent fuel charge can continue to burn.

This continued burning action tends to burn up a great deal of the normally unburned gases, as well as changing a significant portion of the carbon monoxide into carbon dioxide.

The air suction valve is essentially a check valve which allows fresh air to flow only from the air cleaner into the exhaust port. Any air that has passed the air suction valve is prevented from returning. Inspect the air suction valves in accordance with the Periodic Maintenance Chart. Also, inspect the air suction valves whenever stable idling cannot be obtained, engine power is greatly reduced, or there are abnormal engine noises.

Air suction valve removal and inspection should be carried out only by a competent mechanic following the instructions in the Service Manual.

Valve Clearance

Valve and valve seat wear decreases valve clearance, upsetting valve timing. NOTICE If valve clearance is left unadjusted, wear will eventually cause the valves to remain partly open; which lowe ...

Exhaust Device

This motorcycle is equipped with a exhaust device system. This system controls the valve in the exhaust pipe and produces stable engine power at low and middle engine speed. This exhaust device i ...

Other materials:

Clutch Plate, Wear, Damage Inspection
Visually inspect the friction and steel plates for signs of seizure, overheating (discoloration), or uneven wear. Measure the thickness of each friction plate [A] at several points. If any plates show signs of damage, or if they have worn past the service limit, replace them with new on ...

Evaporative Emission Control System (California model only)
This system routes fuel vapors from the fuel system into the running engine or stores the vapors in a canister when the engine is stopped. Although no adjustments are required, a thorough visual inspection must be made at the intervals specified by the Periodic Maintenance Chart. Inspection ...

Connecting Rod Big End Bearing Insert/Crankpin Wear Inspection
Remove the connecting rod big end (see Connecting Rod Removal). Cut strips of plastigage to crankpin width. Place a strip on the crankpin parallel to the crankshaft installed in the correct position. Tighten the connecting rod big end nuts to the specified torque (see Connecting Rod I ...