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2006 crf 450 trans oil getting in motor

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i have a 2006 crf 450. the transmission oil is getting low and the engine oil will overfill.... right side crank seal are could it be something else?

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Main bearing seal on primary gear side is toast. You can pull primary gear and replace it without splitting cases, chances are it's a sign the crank bearing is worn and allowing it to wiggle.

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