Ok guys, I was out riding sunday and everything was going good. My buddy and I stopped for a few minutes and when I started the bike again I could hear a loud banging that sounded like it was in the top end. I quickly shut it down and proceeded to push my bike out of the deep ravine that I was in. After I got it home I turned the engine over with my hand while holding the compression release and could feel the engine just stop somewhere near TDC if I pushed really hard I could feel it break lose and make another rev. I'm thinkin a valve is hitting the piston. Has anyone had this happen to them? If so what was the problem and what all did it take to repair it? The funny thing is my buddy's WR 400 did the same thing about 1 month ago. He has been putting off fixing it because he thought it was the lower rod bearing and wasn't thrilled about splitting the case.