Zipper’s Sport 107 kit for 2007-Up Big Twin bikes is designed to provide maximum torque and horsepower in the range where most of us ride – between 2,000 and 5,000 RPM. If you’re the type of rider who rarely runs your engine to redline, this kit is for you. We’ve carefully matched our Stage II cylinder head design with our Red Shift® 575 camshafts and optimized the compression ratio for super strong low and mid-range acceleration. With just a twist of the wrist, you’ll have the power to pass without downshifting, even when your bike is loaded down for the long ride!

The Sport 107 kit includes specially designed high velocity CNC porting with premium components for your heads, forged, 3.937” bore flat top pistons precisely fitted to your cylinders and a top quality gasket set is included for assembly. Red Shift® 575 cams and dual-piston cam chain tensioners, an Axtell oil bypass valve and Pro-Taper pushrods provide the utmost in valve train stability and durability. The Sport 107 is designed to retain the factory throttle body and injectors, reducing cost. Our MaxFlow air cleaner directs plenty of clean, stable air through the intake tract so that best power can be achieved, and a pre-programmed ThunderMax® EFI controller takes the hassle out of quickly achieving a great tune without needing a dyno. Everything you need is supplied in a single part number and installation is straightforward.

If you want your bike to pull like a freight train when you twist the throttle, the Sport 107 will not disappoint!

All kits can be purchased whole or in any combination of desired components, please contact our sales department at 410-579-2828 for more details and pricing.

This kit uses your factory head and cylinder cores sent in for modification, expect 1-2 weeks completion time. We keep exchange heads and cylinders in stock already modified for quicker turn-around; parts must be in nearly perfect cosmetic condition, expect the same from us. You can also purchase heads and cylinders outright (without supplying a core set). We will supply clean, reconditioned factory castings for your application – add part # 517-010 (cylinders) and 517-015 (heads) to your order.


Zipper’s Sport 107″ Kit for 2007-Up Big Twin Models

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.

*To ensure you enjoy a premium experience, Please fill out a Build Sheet/Job Order Sheet prior to completing an order on the website.
Click here for Zipper’s Build Sheet/Job Order Sheet

Weight 1 lbs
Emissions Compliant

Country of Origin

Engine Type


Fuel / Air


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