2000 polaris 400 2 stroke 4x4 bottom end
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The 400 Xplorer wasn't a racer quad that a 250r was,but you can improve response. I'd head for a clutch kit or just a simple spring change first and see if that is good enough for you.Even with a big bore kit it would just be a faster utility quad. I'd also give Rick Ritter a holler as he lives and breathes 400 engines.He can help on clutch springs,clutch kits and engine mods.Ritter Cycle Racing - FAST, NOT FICTION.