HI all, new to the forum, new to dirt bikes and new to my WR450F! I went out over the weekend and did some trail riding with some new friends, temps in the high 80's and it was more of the slower, tight woods riding than the fast, open riding. At some point into the ride, about 45 minutes or so, we noticed my radiator starting to overflow. We stopped, let it cool down, and then rode again and the overflow repeated itself. At the end of the ride I barely had anything left in the radiator. One of the guys I was riding with had suggested using Evans coolant, along with possibly a new water pump and a high pressure radiator cap. Doing some research it appears that Evans is a good place to start. I pulled off the water pump cover as well to look at the impeller, which shows no damage. Is the impeller supposed to spin while the bike is shut off or just move slightly in both directions? Just wanting to check to see what's normal.... So my question, should I just start with the coolant, or do the Boyeson water pump kit and the radiator cap as well, or some combo of the 3? Just want to make sure I'm doing the right thing, thanks again for the help!