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Big Bore Kits
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Unlock Serious Power with Harley-Davidson® Big Bore Kits
Unlock Serious Power with Harley-Davidson® Big Bore Kits
When you're ready to take your ride to the next level, Harley-Davidson® big bore kits deliver the performance boost you've been chasing. Designed for riders who want more torque, horsepower, and throttle response, these kits are built to wake up your bike and transform your ride.
A big bore kit increases your engine’s displacement. Key components like cylinders and pistons deliver stronger performance throughout the RPM range. That means faster acceleration, harder launches, and more confidence every time you twist the throttle. Chase speed on the street and get more muscle for every mile. Big bore kits are how you bring factory power to its full potential.
Looking for more ways to amplify your ride? Explore the full Screamin’ Eagle® collection.
Engineered for a Seamless Fit
Each Screamin’ Eagle® big bore kit is precision-designed to work with your specific Harley-Davidson® bike. Developed by the same engineers who designed your bike, these kits offer factory-level fit and finish — without the guesswork. No cutting corners. No second-guessing compatibility. Just pure performance backed by Harley-Davidson quality and expertise.
With multiple stages to choose from, you can tailor your upgrade to match your riding style — from aggressive urban runs to full-on highway domination. Shop Harley-Davidson® big bore kits to take your ride up a level.
Want to take your bike even further? Explore H-D’s full range of motorcycle parts to complete your custom build with intake, exhaust, tuning options, and more.