Normal or bad?

My 04' 450 always give a little rattle from the bottom end when I shut it down. It has done this since I've owned it (August). I'm just wondering if its just in the tranny/gears, or if I might need to take a look at my counter-balance bearings (the only ones i forgot to really check when I had the cases apart last time). I don't really want to split cases again if it's nothing to worry about. Anybody know?

I bought my 05 YZ450F in June and it always rattled from new. Not specifically on shutdown just all the time. It is just really noisey..

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