Just because my mind doesn't seem to switch off overnight I'm actually struggling to see where you may have been at fault. You say he did 100 miles before breakage and no doubt you did miles also. I thought the engine itself was bullet proof. You can abuse the clutch and the chain could he have abused the rev range ?. Excited and testing rider ? I dont know but honestly I dont see where it's your fault and it was just unfortunate.
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