I tore into the top of WR the other day for the first time. This is the first dealing I have had with these bikes and am now reallizing why there are so many posts about valve adjustments. It looks to me like there are lifters oppperating the valves and am curious if anyone has seen any roller lifters available. Thought this would free up some extra hp (slight I am sure) and also provide a little better longevity. Curious what you guys think or know.