Join Date: Nov 2014
Location: Depressing state of Michigan (USA)
Over time you'll lose power, fuel economy, etc. At the 25,000 mile mark (quite farther than the 16k recommended) I had the valves checked, new plugs & coils, air filter, and a dyno tune. The bike runs considerably better, sounds better, so yes, it is something you'll want to do when you notice a decline in performance or just want a "pick me up." The dyno tune had a lot to do with it, but the valves did require a slight adjustment.