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Hello, I just purchased a grass kart powered by a rmx250, and thought I should check it out before I try turning it over. Turns out the underside of the Piston has smashed on something lower down, causing a lip to disintegrate. So I rang the local wholesaler to purchase a rebuild kit and they don’t have any rmx Pistons 70mm in diameter, so I’m assuming someone has rebored this incorrectly which has caused the damage. Whats the best solution? And what engine has a 70mm Piston that I can order? I would like this engine back together ASAP! TIA