250x/300ex piston
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Maybe Wiseco can answer your question. It's a little strange to me too. The bores are identical but the stroke is longer on the 300. There must be some reason the 250X has more compression. I know that the 250 has a decompression valve and the 300x does not. And if you've ever tried to kick a 250X without the decompressor valve being hooked up, it almost hurts.
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