Everyone likes different "protection stuff" so here is my .02.
1. Skid plate, Uath Sport Cycle has a good one! I"ve been using it for about 8 years now. I run strips of door trim insulation under my frame where the skid plate come in contact with the frame, the same for the brackets that hold the plate to the frame. I do this to cut down on vibration and it also help with noise reduction during sound checks! I also use a copper anti-seize on bolts, to ensure that when I need to remove the plate, I have no problems. The only problem with this plate is, if you don't remove it to change the tranny oil, it will make a mess. I don't mind removing the plate to change the oil, it give me a chance to inspect the under side of the bike / motor.
http://utahsportcycle.com/store/gasgaspic.htm
2. Hand Guards, I like the Moose Aluminum Bark Busters, With E/E Deflectors and this bracket to mount to the bars.
http://www.gofasters.com/index.php?m...roducts_id=322
I have used the Acrebis plastic guards, once and only once! The result was a broken collar bone. It was about 29 degres out side during an enduro and I smacked a pine tree limb in 3rd gear WFO, the guard was frozen it shattered the limb pinned the front break and the rest was painfull!
3. Rad Guards....I don't use them, sorry no help