When you're looking to enhance your Street Bob's power, improve its torque, and maximize your riding experience, choosing the right big bore kit is vital. With options like the S&S Cycle 124 Big Bore Kit and the 107 Big Bore Kit, you can achieve significant increases in engine performance. These kits not only promise higher compression ratios and user-friendly installations but also come with various features tailored to your needs. The right choice could transform your ride, but understanding the nuances between each kit is essential for making an informed decision.

Things to Note

• Big Bore Kits increase engine displacement, enhancing horsepower and torque for improved ride performance.
• S&S Cycle offers various kits, including options for M8 models and Big Twin models, ensuring compatibility across different years.
• Features like higher compression ratios (up to 10.5:1) maximize power output but may require higher-octane fuel.
• Most kits are designed for easy bolt-on installation, although some may need skilled technicians for precise fitting.

S And S Cycle M8 Models W/107 124 In124 Big Bore Kit M8 Blk 910-0681 New

For Harley Davidson enthusiasts seeking to enhance their M8 models, the S&S Cycle 124 Big Bore Kit offers a powerful bolt-on solution with a 4.250-inch bore and forged pistons, ensuring a significant performance boost without the need for machining.

Designed for both 107 and 114 M8 models, this kit is available in highlighted and non-highlighted versions, featuring a sleek wrinkle black finish with non-highlighted fins.

The kit includes all necessary gaskets and hardware, making installation straightforward.

With a compression ratio of 10.5:1, it maximizes performance while maintaining durability.

Manufactured in the USA, this kit is compatible with various Harley Davidson models from 2017 to 2020, solidifying its place as a top choice for riders looking to upgrade their experience.

Best For: Harley Davidson enthusiasts looking to significantly boost the performance of their M8 models with an easy-to-install big bore kit.

Pros:

• Easy bolt-on installation with no machining required.
• High-quality forged pistons and a competitive compression ratio of 10.5:1 for enhanced performance.

Cons:

• Customer reviews indicate mixed satisfaction, with an average rating of 4.0 out of 5 stars.
• Best Sellers Rank suggests it may not be widely recognized compared to other products in the market.

S&,S Cycle 107&Prime, Wrinkle Black Big Bore Kit 910-0500

The S&S Cycle 107' Big Bore Kit 910-0500 is ideal for those seeking a powerful upgrade without the need for extensive modifications, thanks to its easy bolt-on installation.

This kit boasts the largest bore at 3.937' for stock engines, eliminating the need for machining of the case or piston boring. It features cylinders designed with 11 fins to closely resemble OEM shape and color, ensuring a seamless look.

The centrifugal cast cylinder liners offer impressive tensile strength of 40,000 psi, while CP pistons enhance wear resistance and performance.

Included in the kit are piston rings, wrist pins, clips, and top and bottom cylinder gaskets, making it a thorough solution for riders looking to boost their machine's capabilities.

Best For: Riders looking for a powerful engine upgrade with easy installation and no machining requirements.

Pros:

• Bolt-on installation allows for quick upgrades without extensive modifications.
• High tensile strength of cylinder liners ensures durability and performance.

Cons:

• Limited to stock engines, which may not suit those looking for more extreme modifications.
• Higher price point compared to basic upgrade options.

S&S Big Bore Black Kit for Harley Davidson FXD & Big Twin Models

Riders seeking a significant power boost for their 2006-2013 Harley Davidson FXD and Big Twin models will find the S&S 106 in. Big Bore Black Kit an ideal upgrade.

This kit features a generous 3.927in. bore, providing the largest size compatible with stock cylinder heads without the need for case boring or splitting.

It includes all essential components—cylinders, pistons, rings, and gaskets—ensuring a straightforward installation process.

With a 10:1 compression ratio and 106in. displacement, this kit delivers impressive performance enhancements.

Made in the USA, it fits various Harley models, including Softail and Road Glide.

Customers have praised the kit for its noticeable power increase and ease of installation, making it a top choice for performance-driven riders.

Best For: Performance-driven riders looking to enhance the power and efficiency of their 2006-2013 Harley Davidson FXD and Big Twin models.

Pros:

• Easy installation without the need for case boring or splitting.
• Significant power boost with a 10:1 compression ratio and 106in. displacement.

Cons:

• Requires skilled technician for assembly, which may increase installation costs.
• Clearances and assembly specifications must be checked, adding complexity.

S&S Big Bore Kit for Harley Davidson 1999-2006 Big Twin Models

Designed specifically for Harley Davidson Big Twin models from 1999 to 2006, the S&S Big Bore Kit delivers impressive performance enhancements with its robust 97 cubic inch displacement.

Featuring a bore of 3.927 inches and a stroke of 4 inches, this kit offers optimized compression ratios depending on the head configuration.

It includes essential components like cylinders, pistons, rings, and gaskets, all finished in durable black or silver powder-coat.

Installation is straightforward and doesn't require boring or splitting existing cases, although it's best handled by a skilled technician.

With a customer rating of 5.0 out of 5 stars, the S&S Big Bore Kit stands out in the market, promising to elevate any Harley Davidson's performance.

Best For: Enthusiasts looking to enhance the performance of their Harley Davidson Big Twin models from 1999 to 2006.

Pros:

• Easy installation without the need to bore or split existing cases.
• High customer satisfaction with a perfect 5.0 out of 5 stars rating.

Cons:

• Requires skilled technician for assembly to ensure proper installation.
• Compatibility limited to specific Harley Davidson models from 1999 to 2006.

S&S Cycle 910-0650 Bolt-In Sidewinder 4in. Big Bore Kit – 110in. – Silver

Offering a bolt-in installation with no machining required, the S&S Cycle 910-0650 Big Bore Kit is perfect for Harley Davidson enthusiasts looking to boost their engine size efficiently.

This kit increases engine sizes from 88in. to 100in., and from 96in. and 103in. to 110in., achieving a robust 10.5:1 compression ratio. Crafted with a cast ductile iron sleeve in cast aluminum, it guarantees superior heat transfer.

Customers receive a complete kit that includes cylinders, forged pistons, rings, and gaskets, available in a sleek silver or wrinkle black finish.

Weighing 25.5 pounds and measuring 19.5 x 9 x 8 inches, this kit fits various Harley Davidson models but isn't compatible with S&S 79cc heads.

Best For: Harley Davidson enthusiasts seeking an easy and efficient way to increase their engine size without the need for machining.

Pros:

• Bolt-in installation means no machining is required, making it user-friendly for DIYers.
• Superior heat transfer due to the cast ductile iron sleeve in cast aluminum construction.

Cons:

• Not compatible with S&S 79cc heads, limiting options for some customers.
• Weight of 25.5 pounds may be a consideration for some motorcycle setups.

S&S Cycle Cylinder Kit 117Tc Gray 910-0474

For those seeking significant performance enhancements without extensive modifications, the S&S Cycle Cylinder Kit 117Tc Gray 910-0474 stands out as an ideal choice thanks to its easy installation and compatibility with stock cylinder heads.

This big bore kit delivers impressive results while eliminating the need to bore or split existing cases.

Constructed from premium aluminum castings with cast-in iron liners, it includes everything needed for installation: cylinders, pistons, rings, and gaskets.

Available in both black and silver powder-coat finishes, the kit is made in the USA and weighs 24.3 pounds.

However, it's crucial to acknowledge that this kit isn't suitable for Twin Cooled motors, and users should check clearances and assembly specifications during installation for peak performance.

Best For: Riders looking to enhance their motorcycle's performance easily without extensive modifications to the engine.

Pros:

• Easy installation without the need to bore or split existing cases.
• Includes all necessary components, such as cylinders, pistons, rings, and gaskets.

Cons:

• Not suitable for Twin Cooled motors, limiting compatibility.
• Requires skilled technician for assembly, which may incur additional costs.

S And S Cycle 17-18 M8 Models Big Bore Cylinder Set Blk 910-0683 New

The S&S Cycle 17-18 M8 Models Big Bore Cylinder Set Blk 910-0683 is the ultimate choice for Harley Davidson enthusiasts seeking to enhance performance with a bolt-on kit that maximizes bore size without machining.

Designed for both 107 and 114 M8 models, this kit features a 4.250-inch bore size and forged pistons, achieving a 10.5:1 compression ratio.

Available in highlighted and non-highlighted versions, the wrinkle black finish offers a sleek look.

Each set includes gaskets and all required hardware for easy installation, making it a user-friendly upgrade.

Compatible with various Harley Davidson models from 2017 to 2020, this American-made product weighs 26.6 pounds and measures 18 x 14 x 11 inches, ensuring a perfect fit.

Best For: Harley Davidson enthusiasts looking to enhance their bike's performance with a bolt-on upgrade for 107 and 114 M8 models.

Pros:

• Easy installation with a complete bolt-on kit that includes gaskets and necessary hardware.
• Achieves a significant performance boost with a 4.250-inch bore size and 10.5:1 compression ratio.

Cons:

• Limited to compatibility with specific Harley Davidson models from 2017 to 2020.
• Heavier item weighing 26.6 pounds, which may impact handling during installation.

Factors to Consider When Choosing a Street Bob Big Bore Kit

When choosing a Street Bob big bore kit, you need to take into account several key factors.

First, verify the kit's compatibility with your specific model, as not all kits fit every bike.

You should also evaluate installation complexity, performance features, and the quality of components to get the best results.

Kit Compatibility With Models

Choosing the right Big Bore Kit for your Street Bob means checking its compatibility with your specific model year, as many kits are tailored for Harley Davidson bikes from 2017 to 2020.

Start by verifying the bore size offered by the kit. Different kits provide varying bore dimensions, like 4.250 inches or 3.937 inches, and this can greatly impact engine performance.

Next, confirm whether the kit is a bolt-on design that requires no machining. This option simplifies installation and works best for stock engines.

It's also important to check if the kit includes all necessary components, such as gaskets, forged pistons, and required hardware, to make sure a complete installation without missing parts.

Installation Complexity and Requirements

Understanding the installation complexity and requirements of a Big Bore Kit is key to guaranteeing a smooth setup and best performance for your Street Bob. Typically, installing a big bore kit calls for a skilled technician since confirming proper clearances and assembly specifications can be complex.

Fortunately, most kits are designed as bolt-on solutions, which means you won't need extensive machining of existing engine components, simplifying the process.

Before diving into installation, make certain you have all necessary gaskets, hardware, and tools. While these components usually come with the kit, they can vary by manufacturer, so double-check.

Additionally, some kits may require specific torque settings and procedures to ascertain your engine runs reliably and lasts longer.

It's also vital to verify compatibility with your existing engine setup. Some modifications might be necessary to achieve peak performance, so don't skip this step.

Performance Enhancement Features

To elevate your Street Bob's performance, focus on key features like bore size, piston quality, and overall kit compatibility. A larger bore size, such as 4.250 inches, can greatly maximize engine displacement and power output, giving you that extra punch on the road.

When selecting your big bore kit, consider those that come with forged pistons and a higher compression ratio—like 10.5:1. This combination provides improved performance and engine efficiency, allowing your bike to run smoother and stronger.

It's also vital to guarantee the kit is designed for easy installation. Kits that don't require machining can save you both time and labor costs, making the upgrade hassle-free. Look for kits that include all necessary components, such as gaskets and hardware, to streamline your installation process.

Lastly, evaluate the materials used in the kit. Premium aluminum castings with cast-in iron liners not only offer durability but also enhance heat transfer efficiency, which is important for maintaining peak performance under load.

Quality of Components Used

When selecting a Street Bob big bore kit, the quality of components often makes a significant difference in performance and longevity. High-performance pistons made from forged materials are indispensable, as they enhance durability and reduce wear compared to cast alternatives.

You'll want to look for cylinder liners crafted from ductile iron, which offers high tensile strength for superior heat transfer and longevity, guaranteeing your engine runs efficiently under stress.

Precision-engineered gaskets and seals are important too, preventing leaks and maintaining peak compression ratios. This is essential for maximizing your engine's performance. While some kits may offer lower-quality components, those that include all necessary hardware and installation parts simplify the process and minimize the risk of using inferior items.

Investing in a big bore kit with high-quality components will pay off in improved power output and overall efficiency. Remember, when you choose a kit, you're not just upgrading your ride; you're enhancing its reliability and performance.

Compression Ratio Considerations

The compression ratio plays an essential role in your engine's performance, influencing how much power it can generate from the air-fuel mixture. When considering a big bore kit for your Street Bob, a higher compression ratio, like 10.5:1, can greatly boost horsepower and torque. However, you'll need to use higher-octane fuel to prevent knocking, which can compromise your engine's reliability.

It's also crucial that the new compression ratio is compatible with your engine's existing components, including cylinder heads, to guarantee ideal performance and avoid potential damage. If you're planning other modifications, such as an upgraded exhaust system or tuning adjustments, consider how these changes will interact with your new compression ratio.

A well-balanced ratio not only enhances throttle response but also improves overall engine efficiency, making it a key factor in your performance upgrades.

Take the time to evaluate your riding style and performance goals before making a decision. Ultimately, the right compression ratio can transform your Street Bob into a powerful machine, offering an exhilarating riding experience that meets your expectations.

Warranty and Support Options

Evaluating warranty and support options is essential for ensuring your investment in a Street Bob big bore kit is protected against potential issues. Many kits come with an Amazon.com Voluntary 30-Day Return Guarantee, letting you return the product if you're not satisfied. This gives you the chance to test the kit without a long-term commitment.

Always check the warranty information provided with each product, as it typically covers manufacturing defects, giving you peace of mind. Some manufacturers even offer feedback options for reporting lower prices, helping you snag the best deal on your big bore kit.

Keep in mind that assembly specifications and clearances are vital; some kits may require a skilled technician for correct installation. This can influence your overall satisfaction and performance of the kit.

Lastly, don't overlook customer reviews, which often highlight ease of installation and performance enhancements. These insights can serve as valuable support while you're weighing your options.

Frequently Asked Questions

How Do I Know if My Bike Needs a Big Bore Kit?

You'll know your bike needs a big bore kit if you're craving more power or struggling to keep up with traffic.

Notice any signs like sluggish acceleration, difficulty climbing hills, or an overall lack of excitement in your ride.

If you've modified your exhaust or air intake, a big bore kit can help maximize those upgrades.

Pay attention to your bike's performance, and don't hesitate to consult a mechanic for advice.

Will Installing a Big Bore Kit Void My Warranty?

Installing a big bore kit can enhance your bike's performance, but it might also affect your warranty.

You'll want to check your manufacturer's policy, as some modifications do void warranties. If you're unsure, consult your dealer or the warranty documentation.

Weigh the benefits of improved power against the risk of losing warranty coverage, and decide what's best for you and your ride.

It's all about balancing performance with protection!

What Is the Average Installation Time for a Big Bore Kit?

When you're thinking about installing a big bore kit, the average installation time typically ranges from 4 to 8 hours. It mostly depends on your bike's make and model, as well as your mechanical skills.

If you're comfortable working on engines, you might finish it quicker. However, if you're new to this, it's wise to budget extra time or consider seeking professional help to guarantee everything's done correctly and safely.

Can I Install a Big Bore Kit Myself, or Should I Hire a Professional?

Think of installing a big bore kit like planting a garden. You can dig the holes yourself, but without the right tools and knowledge, you might just end up with weeds.

If you've got mechanical skills and the right guidance, you can tackle it. However, hiring a professional's like having a seasoned gardener—ensuring everything flourishes.

Weigh your confidence against the complexity, and decide if you're ready for this DIY adventure or need expert help.

What Maintenance Is Required After Installing a Big Bore Kit?

After installing a big bore kit, you'll need to perform regular maintenance to keep your engine running smoothly.

Check the oil level and change it frequently, as the upgraded engine may generate more heat.

Monitor the air filter for dirt and replace it as needed.

Additionally, inspect the spark plugs and ignition system.

Regularly tightening bolts and checking for leaks helps make certain everything stays in top shape for peak performance.

Conclusion

Just like a caterpillar transforms into a butterfly, upgrading your Street Bob with a big bore kit can set free its true potential.

By choosing the right kit, you're not just enhancing performance; you're starting on a journey of power and freedom.

As you ride, feel the thrill of the open road, knowing you've equipped your motorcycle for greatness.

So, take the leap and watch your ride soar—every twist and turn will become an exhilarating adventure.