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2010 KX450F rod bearing failure

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My sons 2010 KX450f engine locked up on him this weekend during a race. Pulled the top end and the rod bearing is locked up on the crack.

has anyone heard of this on the KX450F. Kind of disappointing

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I've fixed one to date - all others are still going strong.

How many hours, if known? If over 60-70 hours - that's just how it goes sometimes..

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rod bearing seizures are normally caused by lack of oil pressure, check the oil pump, oil filter ect for clogs or wear.

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