2012 Kawasaki Vulcan 1700 Voyager ABS Owners Manual - Page 168

166 MAINTENANCE AND ADJUSTMENT 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. Air Cleaner 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.