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07 exc big bore kit

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Has anybody installed a big bore kit on there 450 or 525 07exc?

How big do you want to go? The easy ones are the 540, 560 and 570 and are all straight bolt on kits.

The 576, 588 and 600 are the first three with the stoker crank.

I've done them all. What kind of power increase are you looking for?

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540 is very practicle, inexpensive and runs excellent, I get them from Travis who has an exchange program, similar kit is available from KTM, quite a bit more $ and your stuck with one compression ratio

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I have heard good things about the 570. I'm not really looking for anything in particular. More than anything I would want reliability.

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I have heard good things about the 570. I'm not really looking for anything in particular. More than anything I would want reliability.

Any of our big bore kit are very reliable. I've started moly coating the pistons on our kits to further help longevity. Our kits come complete with gaskets, cylinders (exchanged) and pistons.

Feel free to call me if you have any questions that don't get answered here.

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