first time i ever seen this type of failure and i run some heavily stressed XT based engines in my supermono and supermoto,
doesnt mean it cant happen, as we see.
im always more interested in the "why?"
one reason i can think of is heavily lugging at low rpm, but not that provable.
when you take the motor appart, check the right main bearing fit in the new cases, if its too loose, that could be another reason.
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