What do you suppose could be causing valve noise in my 2008 Ultra-Roadsmith? The last couple of times I rode, the valve noise came in at about 2500 rpm until it was fully warmed up, then it was quiet. The oil is clean and pretty fresh, about 1500 miles on it. I use Amsoil 20W-50 and have exclusively since 5000 miles. I change oil and filter at 3000 miles, yea I know that's probably a waste, but I feel better about it. I now have a bit over 17000 miles on it. Any help or opinions are appreciated.