First off I'd like to thank TT and all you guys for all the excellent advice. I've learned so much and have prevented so many mistakes thanks to you guys
I've owned my 03 crf450r for two years and have had the time of my life. This has been the best bike I've ever owned, and I've owned a couple (86kx250, 88cr250r, 94rm250, 93cr250r, 87xr250, 79rm100, and a bunch of others) including street bikes. I really love this bike.
Oh yeah, carb boot. Recently, I've replaced my intake valves, had my frame welded, and repaired my head pipe following a most excellent crash ( took a stump at the front right axle and have never been ejected from anything soo fast) So today after my ride, I was sitting and marveling at its beauty and noticed that the carb boot at the air box side was missing the screw and was partially off. All I know is that I work really hard to get that air filter out, clean, and back in and was really to find the dirt being fast tracked into my engine.
I ride in sand and pretty dusty conditions so I'm really worried about the life I've taken from my valves. She still fires up pretty good so I'll wait till the snow before I check.
Thanks again guys and hope I can help some of you guys some time.