I last adjusted the valves on my like at 11,500 miles. The recommended interval is every 5K miles but I didn't check them again until today at 22,000 miles. I could have waited another 5 or 10K as they barely needed adjustment. The Intakes had loosened to .005 Inches from .004 so I adjusted them. The exhausts had not moved so I left them alone.
As with many modern scooters removing and replacing the plastics is a PITA while the actual mechanical work is pretty simple.
