Hi prob no help to you but i habe been in a similar situation with my last xtx took it to a garage and turned out to be a snapped woodruff key.

That was an 08xtx 18500 miles they suspected big end issues before they stripped it down.

HTH Chris

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2 wheels is freedom , 1 wheel is heaven
Theory Passed 3/04/08 das test passed 12/06/08
piaggio nrg 50cc-sold / yamaha xt125r -stolen / Yamaha XT660X