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Message: <blockquote data-quote="thetool" data-source="post: 17796" data-attributes="member: 1534">It may be normal wear on an engine, especially if you have no vertical scratching or scoring in the cylinders.An engine that ingests unfiltered air containing fine dust particles will do this also at an accelerated rate.  It can look like normal wear-out that occurred in just a few hours, tens or hundreds, depending on how much and how dirty the incoming air was.So, the cause is either normal wear(a well maintained Kubota can go over 5000 hrs easily) or unfiltered intake air, due to no or plugged air filters, or a rip in an intake hose, or an intake hose that wasn't secured to the air cleaner or intake manifold.</blockquote>