I believe Kev had his big bore on his old XTX and sold the big bore seperately when he sold his bike.

Not to mention it also pathes the way for a 2009 XTX big bore.

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09 XT660X:

CCC Stainless Rounds, Stage 1 DNA, Stage 2 DNA, PCV With Custom Autotune Map, PCV AutoTune, Home made O2 eliminator, Self machined Fork Spacers, DIY Autotune Switch.