I've been told by service techs that a valve adjustment or check is a waste if the bike is not showing symptoms of the valves being out of adjustment. I do not have any popping, backfiring or trouble starting my bike. I have almost 5000 miles on the bike, I had the first service between 500 and 600 miles. I changed the oil at 3000 miles. If there are no problems should I carry the bike in and have the valves inspected? I am an Industrial Maintenance Tech and I understand that an ounce of prevention goes a long way, however, I also know how expensive that inspection is, and it could be money better spent on accessories. I also would like to know how to perform the check and/or adjustment myself if possible. My friends and I have some long rides planned for the spring and I would like my bike to be in tip top condition. Any info would be greatly appreciated.