To put it mildly, this kit rips! Steve Janes of Snowest Magazine probably best sums up our 660 big bore kit: "Although we liked calling it PeeWee, it certainly proved to be a giant killer on the slopes." A conclusion Steve came to during the 2005 Project Weekend Escape, in which he rode a 600 kitted with a Carl's Performance 660 big bore.

The 660 kit includes boring, plating and porting your cylinders, head and power valve modifications, new piston kits and all necessary gaskets.

We recommend our 660 single pipe, bored carbs, V Force reeds and airbox/clutch cover kit for optimal power gains.

See our 600 Edge and IQ Hop-Up Guides for more complementary items for this kit.

Price listed applies to approved cylinder exchange only. This requires sending us your cylinders for approval. We then substitute pre-done kit cylinders from our inventory for your kit. Price is higher if you plan to purchase new cylinders for use in your kit.