I thought this was odd too, But I'm sure the bearing is bad... As I got deeper into my tear down last night, I found the big end rod bearing was bad as well. In fact, I've never seen so much movement in a rod bearing that wasn't yet completely failed! The small end rod bearing and wrist pin look brand new, so I don't believe its an oil problem, but I never say never... The motor has less than 20 hours on it, I run 40:1 premix, and I can only hope this was a freak thing. My '01 XC250 had well over 300 hours on the original crank and rod bearings using the same 40:1 premix. In fact, it is still riding around out here!
On a side note, the coating on the piston was starting to come off in a couple of places as well. I'm not sure if I'm a fan of that stuff (anti friction coating) or not. Now for a complete crank rebuild...
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