My motor was worn out in about the same # of miles. If you don't break them in super soft they have a tendency to wear out quickly. I know of TE450s that have 10k+ miles on the stock motors without rebuilding, they were broken in soft.
Got 27000km's out of my 450smr and the next owner did another 10000km's last time I spoke to him. Mine wasn't broken in soft either. Don't know what the reason would be for the early failure.
On the plus side looks like a new stroke bore and TC cams will make the pain go away!!
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