After 3 hours its pretty close to being cool again isnt it? And itll start warm if its less than that? That is kind of odd..
Unfortunately theres no way that I know of to test the clutch inside the starter. If replacing it actually works though Ill consider myself very lucky (and buy a lotto ticket or two).
Ill let you know if it works for me but it could easily be a couple of weeks. Im going to order a metal head gasket and maybe the HKS valve springs just for fun and install those..
-j0lt