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Proper way to install piston rings?

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Howdy. I have an 08 crf250r that I'm putting a high compression cylinder kit in. The piston that comes in the kit doesn't say which way is up on the rings, and I'm not sure if it's like a 2 stroke and has marks for up and down. I found the letter that indicates up on the compression rings but the oil rings have no way of telling which way they should go. Also, the instructions say the bottom ring should have a larger gap than the top oil ring, has anybody tried that and seen how it works?

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