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Is my yz125 a yz144?

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My bike has athena cylinder kit on it and how do i figure out if its a big bore or not? Does it just say on it or do i have to measure. The person i bought it from bought it from a kid who raced the person who i bought it from was an idiot. He just doesn't have a clue about anything on the bike and he doesn't even know what bored means. But i did get a pretty sweet bike for an even sweeter dealImageUploadedByThumper Talk1402518850.304733.jpg

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I don't think it's possible to tell without measuring. The easiest way would be to remove the head and measure from the top. 54mm = 125, 58mm = 144.

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