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Just got back from the motocross track, where I busted my quad (2008 KFX 450). Keep in mind that these may be stupid questions. I'm new to riding and don't know anything about anything. The chain was a little loose, I believe, and I probably should've tightened it (not that I know how to tighten a chain) but I'm not sure if that came into play here. I took a jump and didn't let off the throttle. I over-revved the engine and the rear sprocket snapped off while I was in the air. It looks like there are 4 bolts that hold the sprocket on and it appears that those bolts have been completely sheared off (see pics below). If this is just a matter of replacing these bolts, that would be awesome. Are these bolts meant to shear under pressure (like the shear pin on a boat propeller)? Also, in the side that still has nuts, that bolt is pretty skinny. The corresponding hole on the sprocket is much larger. Are these some sort of specialty bolts? Am I not even in the right ballpark with these issues? I seriously have no idea what I'm doing here. I appreciate any help.