I have 26,400 miles on my 2013 GT. My dealer had me wait until winter so they could use my bike for training since they hadn't had any other scooters with that many miles. The valves were within specs, no need to adjust. The drive chain needed replacement due to a kink in the chain (it could have gone farther with no issue of failure). The sprockets did not show any sign of wear. The dealer said that the chain is an o ring chain, so the oil bath doesn't lubricate it's internal bearings. The belt showed little wear and no cracks. They didn't replace the belt. They did replace the rollers in the clutch and the associated plate. The rollers were in backwards (as has been stated elsewhere in other forums) and were worn flat. They replaced the handlebar switches per a recall notice. The switches had not been a problem at all. The dealer said it looks like the GT could go another 24,000 without a major service. I do live in a rural area. Most of the miles were put on commuting 35 miles to work, most of which is open road. So the wear and tear of city driving could require more major service $. So far, so good. The dealer was gracious and didn't charge me labor this time around due to having the bike for an extended time and getting a chance for their mechanic to have a hands on experience with a bike as a whole piece instead of and 'engine assembly', etc. like the factory training. He said that the next time around will cost about $1600.