2012 Kawasaki NINJA ZX-6R Owners Manual - Page 115

MAINTENANCE AND ADJUSTMENT 113 Valve Clearance Valve and valve seat wear decreases valve clearance, upsetting valve timing. 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. NOTICE If valve clearance is left unadjusted, wear will eventually cause the valves to remain partly open; which lowers performance, burns the valves and valve seats, and may cause serious engine damage. Valve clearance for each valve should be checked and adjusted in accordance with the Periodic Maintenance Chart. Inspection and adjustment should be done only by a competent mechanic following the instructions in the Service Manual.