2015 Kawasaki Vulcan 1700 Voyager ABS Owners Manual - Page 169

168 MAINTENANCE AND ADJUSTMENT Air Suction Valves 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 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. A clogged air cleaner restricts the engine's air intake, increasing fuel consumption, reducing engine power, and causing spark plug fouling. The air cleaner element must be replaced in accordance with the Periodic Maintenance Chart. This motorcycle's air cleaner element consists of a wet paper filter, which cannot be cleaned. In dusty, rainy, or on muddy conditions, the air cleaner element should be serviced more frequently than the recommended interval. Air Cleaner NOTICE Use only the recommended air cleaner element (Kawasaki part number 11013-0031). Using the any other air cleaner element will wear the engine prematurely or lower the engine performance.