ok guys i have this big up hill that some rocks are the size of my front tire to the size of the back sprocket, they call it BLACK ROCK because of all the bikes spinning there back tires and now all the rocks are black. now there is 2 lines and i was doing the easy one. lo, but anyway im is there anytips to do it. o yea its lose rock and some rocks wont move. im on a 2001 husky cr 125 with 13/51 gearing.