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Old 02-07-2016, 03:09 PM
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SYCARMS SYCARMS is offline
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Join Date: Sep 2009
Location: Senatobia, Mississippi
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It could be a piston or cracked cylinder. I have personally experienced a hard knock in my engine which turned out to be a starter clutch. You will have to tear it down to pinpoint the problem. Where in Tennessee are you located.