Howdy honda gurus out there. Heres my problem. 2003 650L. Bought the bike with 1600 miles on it. I'm assuming the previous owner did not treat the bike very well. Bald rear tire and very scrathed up plastics were the clues. I switched to synthetic oil once I bought the bike. Rotella 5-40. The bike now has 5500 miles on it and once again the valves are getting very noisy. It likes to do this to me every 1000 miles or so. The last time they needed adjustment they sounded ok but the bike was idling and starting hard. I adjusted the valves and presto, problem solved. Now 1200 miles later the bike idles and starts fine but the valves are singing their unpleasant tune. I do have the habit of riding the bike at high speeds for 4-5 mile spurts. (14/45 gearing) Just passing cars and having fun. Usually between 70 to 85 mph. Other than this ocassional high speed driving I'm very good to her. Is it this occasional high speed driving doing something to my valve train or am I overlooking something? I'm stumped and am sick of adjusting valves. I'm going out to the garage to adjust again right now. I'll let ya know how I make out. Chewwy.