If you have 24K miles on the ride, you need to check your valve clearance. I did mine at half that time and found 7 of the 8 valves to be out of spec. The clearance was too great. Didn't make any difference on the performance of the bike though. Once I adjusted the valve clearance, the valve train was a lot quieter. Too much clearance isn't as serious as not enough. This can lead to the valves not closing on their seats causing poor heat transfer eventually damaging them.
