Bad cylinder scoring.

Niksan258

New Member
Jul 12, 2020
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Hey guys! My bike has been ridden for around 350-400km and started having some loud rattling sounds. I've run it at 20:1 for a tank and then 40:1 with chainsaw mineral oil. Upon opening it up I found pretty bad scoring of the cylinder. What could have been the cause of this and do I need to do a whole top end replacement ?
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