Considering upgrading your Harley Davidson Sportster's performance? Explore the world of possibilities with the top 7 Sportster Big Bore Kits meticulously selected to amplify your motorcycle's power output. From the renowned S&S 3.5 in. bore Cylinder and Piston Conversion Kit to the cutting-edge YFS 200 Blaster Big Bore Kit, each option offers a unique advantage. Immerse yourself in the world of high-performance upgrades and discover how these kits can take your riding experience to the next level.

Things to Note

• Verify compatibility with your specific Harley Davidson Sportster model year.
• Consider performance benefits such as increased displacement and compression ratio.
• Prioritize durability with high-quality materials and coatings for longevity.
• Ensure simplicity of installation with detailed instructions for a smooth process.
• Check warranty coverage and terms to protect your investment.

S&S 3.5 in. bore Cylinder and Piston Conversion Kit for Harley Davidson Sportster

For motorcycle enthusiasts seeking to upgrade their Harley Davidson Sportster for increased power and performance, the S&S 3.5 in. bore Cylinder and Piston Conversion Kit offers a straightforward solution.

This kit is specifically designed for Harley Davidson 1986-2013 Sportster models, boosting the displacement from 883cc to 1200cc without requiring any machining, re-balancing, or cylinder head modifications.

The ready-to-assemble kit includes pistons already fitted to cylinders, along with pistons featuring rings and wrist pins, gaskets, assembly lube, and detailed instructions for easy installation.

Manufactured by S&S Cycle, this kit weighs 20 pounds and has dimensions of 19.5 x 9 x 8 inches.

With positive customer reviews and a best seller rank in Powersports Cylinder Heads, the S&S 3.5 in. bore Cylinder and Piston Conversion Kit proves to be a popular choice for Harley Davidson enthusiasts looking to enhance their bike's performance.

Best For: Riders looking to upgrade their Harley Davidson Sportster for increased power and performance without the need for extensive modifications.

Pros:

• Straightforward installation process with no machining or cylinder head modifications required.
• Significant increase in displacement from 883cc to 1200cc for improved performance.
• Ready-to-assemble kit includes all necessary components and detailed instructions.

Cons:

• Limited compatibility with specific Harley Davidson Sportster models from 1986-2013.
• May not be suitable for riders seeking extreme performance upgrades beyond the 1200cc displacement.
• Cost of the kit may be prohibitive for some budget-conscious motorcycle enthusiasts.

YFS 200 Blaster Big Bore Kit (68 mil Cylinder +2 Over Complete Top End Rebuild Kit)

Ideal for Yamaha Blaster enthusiasts seeking to enhance their motorcycle's performance, the YFS 200 Blaster Big Bore Kit offers a complete top end rebuild solution with a 68 mil Cylinder and +2 Over sizing.

This high-quality kit includes essential components such as the top end gasket, piston rings, wristpin, circlips, and wrist pin bearing, providing durability and longevity for the Yamaha Blaster.

Featuring a forged Wiseco piston known for its superior strength and reliability, this aftermarket top-end kit is designed to boost compression and horsepower effectively.

With easy installation as a direct replacement for the original equipment, Yamaha Blaster owners can trust in the performance upgrades provided by this YFS 200 Blaster Big Bore Kit.

Best For: Yamaha Blaster enthusiasts seeking to significantly enhance their motorcycle's performance.

Pros:

• Complete top end rebuild solution with high-quality materials for durability and longevity.
• Forged Wiseco piston for superior strength and reliability.
• Easy installation as a direct replacement for original equipment.

Cons:

• May require some technical knowledge or professional assistance for installation.
• Higher cost compared to standard replacement parts.
• Compatibility limited to Yamaha Blaster models.

S&S Cycle 910-0481 98 Big Bore Kit Black

The S&S Cycle 910-0481 98 Big Bore Kit Black offers motorcycle enthusiasts seeking enhanced performance a complete upgrade solution that includes gaskets but excludes top Rocker Box, breather, and carburetor gaskets.

Manufactured by S&S Cycle, this kit comes in black powder-coat exterior finish and dimensions of 16 x 10 x 13 inches. The product has received positive customer feedback, with a 5.0 out of 5 stars rating based on 2 reviews.

It's listed under ASIN B00T6J5HLI and ranks #1,311,785 in Automotive and #491 in Powersports Cylinder Heads. The kit doesn't include top Rocker Box, breather, and carburetor gaskets, but customers have praised its quality and the included gaskets.

Best For: Motorcycle enthusiasts looking for a complete upgrade solution to enhance performance.

Pros:

• High-quality kit from reputable manufacturer, S&S Cycle.
• Black powder-coat finish adds a sleek look to the motorcycle.
• Positive customer feedback on the quality and included gaskets.

Cons:

• Excludes top Rocker Box, breather, and carburetor gaskets.
• Limited availability of warranty information.
• May require additional purchases for complete installation.

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

Crafted with a 97 cubic inch displacement and varying compression ratios, the S&S Big Bore Kit by S&S Cycle caters to enthusiasts seeking enhanced performance for their Harley Davidson Big Twin Models.

With a bore of 3.927 inches and a stroke of 4 inches, this kit includes cylinders, pistons, rings, and gaskets for a thorough upgrade.

The kit offers three compression ratio options: 9.7:1 with stock heads, 9.3:1 with S&S 89cc heads, and 10.7:1 with S&S 79cc heads.

Available in black or silver powder-coat finish, the kit is made in the USA.

Installation is straightforward without the need to bore or split existing cases, but professional assembly is recommended to guarantee proper clearances and specifications.

Customer reviews rave about the performance boost provided by this kit.

Best For: Performance enthusiasts seeking enhanced power and torque for their Harley Davidson Big Twin Models.

Pros:

• Significant increase in engine displacement for improved performance.
• Multiple compression ratio options to suit different riding styles.
• Easy installation process without the need for complex modifications.

Cons:

• Professional assembly recommended, may add to overall cost.
• Limited compatibility with specific Harley Davidson models from 2001-2006.
• Warranty limited to Amazon.com's 30-Day Return Guarantee.

S&S Cycle Big Bore Cylinder and Piston Kit

Featuring a bolt-in installation process that eliminates the need for machining or splitting crankcases, the S&S Cycle Big Bore Cylinder and Piston Kit offers motorcycle enthusiasts a straightforward upgrade option for increasing engine size and enhancing performance.

This kit includes cast ductile iron sleeves in cast aluminum for superior heat transfer, allowing for engine size increases from 88in. to 100in., and from 96in. and 103in. to 110in. With a 10.5:1 compression ratio, the performance is streetable and dependable.

Complete kits come with cylinders, forged pistons, rings, and gaskets, providing all necessary components for the upgrade.

Available in wrinkle black or silver powder coat finish, the S&S Cycle Big Bore Cylinder and Piston Kit combines quality materials and precise engineering to deliver improved motorcycle performance.

Best For: Motorcycle enthusiasts looking for a straightforward upgrade option to increase engine size and enhance performance without the need for extensive modifications.

Pros:

• Bolt-in installation process eliminates the need for machining or splitting crankcases
• Superior heat transfer with cast ductile iron sleeves in cast aluminum
• Streetable and dependable performance with a 10.5:1 compression ratio

Cons:

• Limited compatibility with specific engine sizes
• Relatively heavy product weight at 21.9 pounds
• May require professional installation for optimal results

S&S Big Bore Black Kit for Harley Davidson FXD, Big Twin models

Ideal for riders seeking a significant boost in power without the need for extensive modifications, the S&S Big Bore Black Kit for Harley Davidson FXD and Big Twin models offers a straightforward installation process and notable performance gains.

Specifically designed for Harley Davidson 2006-2013 FXD and 2007-2013 Big Twin models, this kit features the largest safe bore of 3.927 inches that can be used with stock cylinder heads, resulting in a 106 cubic inch displacement and a 10:1 compression ratio.

The package includes cylinders, pistons, rings, and gaskets, all made in the USA by S&S Cycle. Customers have praised its ease of installation and reported increased power output, making it a recommended choice for those looking to enhance their motorcycle's performance.

Best For: Riders looking to enhance the power output of their Harley Davidson FXD or Big Twin models without extensive modifications.

Pros:

• Significant boost in power output
• Easy installation process with no need for case modifications
• Made in the USA by S&S Cycle

Cons:

• Requires a skilled technician for assembly
• Responsibility lies with the assembler to check clearances and specifications
• Limited compatibility with specific Harley Davidson models

Glixal Big Bore Cylinder Kit for GY6 49cc 50cc to 105cc Scooter Moped ATV Go-Kart

The Glixal Big Bore Cylinder Kit for GY6 49cc 50cc to 105cc Scooter Moped ATV Go-Kart offers a high-performance upgrade with its 52mm cylinder inner diameter, suitable for enhancing engine power in GY6 49cc to 100cc engines.

Designed for the GY6 139QMB 4-Stroke Engine, this kit includes essential components like the cylinder, piston, piston ring, and more for a thorough overhaul. Manufactured by Glixal, known for quality products, this kit has received positive feedback for its performance and power increase.

Users recommend additional modifications such as a big valve head, carburetor, and camshaft for best results. Proper installation techniques, parts compatibility, and regular maintenance are emphasized to guarantee longevity and peak performance, making this kit a popular choice among scooter enthusiasts.

Best For: Scooter enthusiasts looking to upgrade their GY6 49cc to 100cc engines for enhanced performance and power.

Pros:

• Significant power increase and performance enhancement.
• Quality components and materials for durability.
• Compatible with GY6 139QMB 4-Stroke Engine.

Cons:

• Additional modifications may be needed for optimal results.
• Installation and maintenance require technical expertise.
• Potential compatibility issues with other scooter models.

Factors to Consider When Choosing a Sportster Big Bore Kit

When selecting a Sportster Big Bore Kit, you should consider the size to guarantee it fits your bike's engine.

Look for performance upgrades that match your riding style and needs.

Check for kits that offer easy installation, durability in materials, and improvements in power and compression for enhanced performance.

Size Considerations

Consider the bore size and stroke length as essential factors when selecting a Sportster big bore kit for peak performance enhancement. The increased bore size and stroke length directly impact the displacement of your engine, leading to improved power and torque.

It's important to verify compatibility with your specific Harley Davidson Sportster model year to avoid fitment issues and guarantee a seamless installation process. When choosing a big bore kit, check the displacement increase it offers to understand the level of performance enhancement you can expect.

Look for kits that include all necessary components such as pistons, cylinders, gaskets, and detailed assembly instructions to simplify the upgrade process. Additionally, verify whether any extra modifications or tuning are needed to fully take advantage of the benefits of the big bore kit.

Performance Upgrades

Size considerations play a vital role in determining the performance upgrades you can expect when selecting a Sportster big bore kit. Upgrading to a larger bore size can result in increased displacement, leading to enhanced horsepower and torque output.

Additionally, higher compression ratios achieved through the installation of components like cylinders, pistons, rings, and gaskets can further boost the overall performance of your motorcycle. It's important to verify the compatibility of the kit with your specific Sportster model to maximize the potential gains.

Keep in mind that the performance benefits can vary based on the kit's specifications, including bore size, stroke, and compression ratio. To fully capitalize on these enhancements, proper installation and tuning are necessary.

Consider any additional modifications or adjustments required to optimize the performance of your Sportster with the chosen big bore kit.

Installation Simplicity

Look for Sportster big bore kits that prioritize ease of installation through bolt-in compatibility and detailed instructions. Opt for kits that offer a straightforward installation process without the need for machining or splitting crankcases.

Make sure the kit includes all necessary components and is designed as a direct replacement for the original equipment to guarantee compatibility and simplicity during installation. It's crucial to verify if any special tools or additional parts are required for the installation to avoid any surprises during the process.

Additionally, checking user reviews or feedback on the simplicity of the installation can provide valuable insights before committing to a purchase. By selecting a big bore kit that focuses on ease of installation, you can save time and effort while upgrading your Sportster motorcycle's performance efficiently.

Material Durability

When selecting a Sportster big bore kit, prioritize endurance by evaluating the materials used in the cylinders and pistons for long-lasting performance. Opt for kits that feature high-quality materials such as forged aluminum or cast iron, as these materials offer improved durability and superior heat dissipation capabilities.

It's essential to choose components that can withstand the increased stress and heat generated by a larger bore size without compromising performance. Additionally, checking for coatings or treatments on the cylinders and pistons is vital to guarantee they can resist wear, corrosion, and heat damage over time, thereby extending the lifespan of your motorcycle's engine.

Before making a purchase, take the time to research the manufacturer's reputation and read customer reviews to gauge the durability and longevity of the materials used in the big bore kit. Prioritizing material endurance won't only enhance your motorcycle's performance but also secure a long and reliable engine life.

Power and Compression

Consider the impact of increased bore size and compression ratio when selecting a Sportster big bore kit for best power and performance enhancement.

By increasing the bore size, you can boost the engine's displacement, resulting in heightened power and torque. The compression ratio is equally vital, as higher ratios typically lead to increased power output.

However, it's essential to strike a balance between power gains and engine reliability, as extreme modifications can affect longevity. Understanding how changes in bore size and compression ratio influence fuel efficiency and overall engine performance is key to choosing the right kit.

Additionally, consider the intended use of your motorcycle; kits can be optimized for street riding, drag racing, or other specific applications. Keep these factors in mind to ensure that your Sportster big bore kit not only enhances performance but also aligns with your motorcycle's needs.

Compatibility Check

To confirm a proper fit for your Harley Davidson motorcycle, it's essential to verify the compatibility of the Sportster big bore kit with your specific model year and engine size.

Check if any modifications to the cylinder head, crankcase, or other components are necessary for installation. Additionally, make sure that the kit includes all required components such as cylinders, pistons, rings, gaskets, and assembly instructions.

It's important to take into account the increase in displacement and compression ratio offered by the big bore kit to align with your performance goals and riding style. If uncertain, seek advice from a professional technician or Harley Davidson specialist for guidance on selecting the right kit for your Sportster.

Warranty Coverage

Understanding the warranty coverage provided by manufacturers is vital when selecting a Sportster big bore kit. Warranty terms can vary, typically ranging from 30 days to several years. It's important to verify what the warranty covers, including parts and labor, before making a purchase.

Some manufacturers may offer specific warranties for different components like cylinders, pistons, or gaskets. To validate the warranty, proper installation by a qualified technician is often a requirement, highlighting the significance of following installation instructions diligently.

Frequently Asked Questions

Will Installing a Big Bore Kit Affect My Motorcycle's Warranty?

Installing a big bore kit on your motorcycle could potentially void your warranty. Manufacturers often specify that modifications like big bore kits can impact the warranty coverage.

It's essential to review your warranty terms and consult with your dealer before making any modifications to your bike. Being informed about the potential consequences will help you make the best decision for your motorcycle and warranty coverage.

Do I Need to Rejet My Carburetor After Installing a Big Bore Kit?

When you upgrade to a large bore kit, you'll likely need to rejet your carburetor. This step guarantees your engine runs smoothly and efficiently with the increased airflow. Ignoring it could lead to poor performance or potential damage.

Can I Use My Existing Exhaust System With a Big Bore Kit?

Yes, you can use your existing exhaust system with a big bore kit. However, it's suggested to upgrade to a higher-flowing exhaust for peak performance gains.

While the stock exhaust may work, a new system will better complement the increased power output from the big bore kit.

Consider upgrading to maximize the benefits of your motorcycle's enhanced performance.

How Much Horsepower Gain Can I Expect From a Big Bore Kit?

You can anticipate a substantial increase in horsepower from a big bore kit. By expanding the cylinder displacement, your engine can produce more power and torque, resulting in enhanced performance.

The precise horsepower gain will depend on the particular kit you select and your bike's current setup. Researching and choosing a kit that aligns with your performance objectives and guarantees correct installation are crucial for achieving the best outcomes.

Is Professional Installation Recommended for Big Bore Kits?

For big bore kits, professional installation is highly recommended. This guarantees that the upgrade is done correctly and minimizes the risk of any potential issues down the road.

Professional mechanics have the expertise and tools needed to install the kit properly, optimizing its performance on your motorcycle. While it may cost extra, the peace of mind and improved results are worth it in the long run.

Conclusion

Now that you've explored the top 7 Sportster Big Bore Kits, imagine the roar of your upgraded Harley Davidson as you hit the open road with increased power and performance.

With options like the S&S 3.5 in. bore Cylinder and Piston Conversion Kit and the YFS 200 Blaster Big Bore Kit, you can easily take your motorcycle to the next level.

So go ahead, choose the perfect kit and experience the thrill of a faster, more powerful ride.