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 bum up a great deal of the normally unburned gases, as well as change a significant portion of the carbon monoxide into carbon dioxide.
The air suction valve is essentially a check valve that 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 is abnormal engine noise. Air suction valve removal and inspection should be done only by a competent mechanic following the instructions in the Service Manual.
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