There is a weird noise coming from the rear end of my shee. It feels like the chain is skipping the sprocket, or some kind of spline jumping another one, but my chain and sprockets are brand new and my chain is tight. It happens like if I do a wheelie and I get to the balance point, then I give it another shot of gas and "clunk clunk clunk" really fast. Or the other day i was riding in the snow spinning out, then it got grip and did it did the same thing again. I have new bearings in my axle carrier too, that was my first thought.