Zipper’s 128 Gen 2 Sleeper Big Bore Kit

The 128 Gen 2 Sleeper Kit is the entry level big bore kit that delivers powerful results with minimal parts changed. To keep the cost reasonable on this package, the Sleeper 128 kit uses your factory unmodified heads, along with the OEM throttle body and manifold. No cores needed to ship, just buy the kit in advance and install it once the motorcycle arrives on the lift. The Sleeper 128 kit is a huge gain in power, for just a cam & cylinder swap. The RS532 cam gives you immediate throttle response at any RPM, and shines across the board in this package.

If you prefer more top end rush, and a slightly later torque curve, you can upgrade this kit with a Red Shift Cams RS548 cam, but this does require higher lift valve springs. Both combinations are very similar to one another as the comparison graph shows, just a slight shifting of the powerband by the camshaft.

Not legal for sale or use in California on any pollution controlled motor vehicle.
Not legal for sale or use on any EPA pollution controlled motor vehicle.

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