I HAVE AN 01 KATANA GSX 600 I JUST ROLLED 9000 MILES I HAD THE PLUGS CHANGED THE VALVES ADJUSTED AND OF COURSE I CHANGE MY OIL EVERY 1500 MILES. I RECOMMEND TO ANY KATANA OWNER TO STAY UP WITH THE SCHEDULED MAINTENANCE,BUT MAN SINCE THIS LAST SERVICE IT RIDES BETTER THAN IT EVER HAS !!!!!!!!!!