Stripped all of the teeth off of my rear sprocket yesterday (I should've replaced it earlier). Read in Motocross action that they always add one tooth (50 instead of the stock 49) to the rear to help 3rd gear. This was specifically talking about the 2002. I have the 2000. Any comments or suggestions? Also, is it best to replace front & rear sprockets & the chain all at one rather than piece by piece?