Hey Spud and others.
I've read this thread several times (and enjoyed it too) eventhough I dont own an xr650L.
One thing I've always wondered.....Have no one tried to see what opening the fender does to oiltemps on a stock un-oilcoolered bike. Theres a little talk about it last in the thread, but nothing specific. On paper it should be a great, cheap and easy way to help cooling the bike...But sometimes, real world experiences is very different.
I own an xt600, and have cut of a couple of centimeters of the lower back part of the front fender, in an attempt to add more air to the head, but never did "the science" and meassure temps.
Did you ever try to cover the cooler to see what that did to the temps? And did you try to cover up the the mesh screen on the fender aswell, to se what stock temps is?
Thanks for youre time