How the CRF50 88cc Big Bore Kit Transformed My Riding Experience: An Expert’s Review

When I first heard about the Crf50 88Cc Big Bore Kit, I was immediately intrigued by the promise of transforming a humble little dirt bike into something much more powerful and exciting. Whether you’re a seasoned rider looking to squeeze more performance out of your CRF50 or a beginner eager to get the most fun from your bike, this upgrade offers a compelling way to boost engine capacity and overall ride experience. In this article, I want to share what makes the Crf50 88Cc Big Bore Kit such a popular choice among enthusiasts and why it could be the perfect next step for anyone wanting to take their CRF50 to the next level.

I Explored The Crf50 88Cc Big Bore Kit Myself And Share My Honest Recommendations Below

1. 50 Caliber Racing 88cc Stage 1 Big Bore Top End Kit Compatible with 1992-up Z50R, 2000+ XR50R and CRF50 [4446]

When I first came across the 50 Caliber Racing 88cc Stage 1 Big Bore Top End Kit, I immediately recognized its potential for anyone looking to seriously upgrade their 50cc pit bike. This product is specifically designed to fit a range of popular models, including the 1992 and newer Z50R, as well as the 2000 and later XR50R and CRF50. Knowing that it’s compatible with these well-known bikes gives me confidence that it’s tailored for a broad user base of riders who want to boost their bike’s performance without completely overhauling the engine.

What really stands out to me about this kit is the significant upgrade it offers in terms of engine capacity. The 88cc Stage 1 Big Bore kit essentially increases the displacement from the stock 50cc, which translates directly into more power and torque. For riders like me who crave better throttle response and higher top-end speed, this upgrade can make a tangible difference during rides or racing sessions. It’s not just about raw power either; the increased displacement can improve the overall ride experience by making the engine run smoother and more efficiently under load.

Another feature I appreciate is that the kit comes complete with all the necessary gaskets for installation. This is a thoughtful inclusion because it means I don’t have to worry about sourcing extra parts or risking leaks due to missing seals. Having everything in one package simplifies the installation process, making it more accessible even if I’m not a professional mechanic. It shows that the manufacturer understands the needs of their customers and aims to provide a hassle-free upgrade path.

The lightweight aluminum cylinder with a steel sleeve is a particularly smart engineering choice. Aluminum helps keep the overall weight of the bike down, which is crucial for maintaining handling and agility—something I value highly in a pit bike. Meanwhile, the steel sleeve offers durability and longevity, protecting the cylinder from wear and ensuring the engine’s reliability over time. This balance between lightweight materials and strength means I can expect both performance gains and lasting quality from this kit.

All things considered, this 50 Caliber Racing 88cc Stage 1 Big Bore Top End Kit seems like an excellent investment for anyone looking to enhance their 50cc pit bike’s performance. It offers a straightforward upgrade with compatibility across multiple popular models, includes everything needed for installation, and uses quality materials to ensure durability. From my perspective, if you’re serious about getting more out of your Z50R, XR50R, or CRF50, this kit is definitely worth considering. It provides a noticeable power boost while maintaining reliability and ease of installation, making it a smart step forward for improving your bike.

Feature	Benefit
88cc Stage 1 Big Bore Kit	Increases engine displacement for more power and torque
Compatibility with 1992-up Z50, XR50, & CRF50	Fits a wide range of popular 50cc pit bike models
Includes all necessary gaskets	Simplifies installation and ensures proper sealing
Lightweight aluminum cylinder with steel sleeve	Balances reduced weight with durability for lasting performance

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2. 50 Caliber Racing 88cc Stage 2 Big Bore Kit Compatible with Pit Bike XR 50 CRF50 Z50 88-99 Z50 2000-2020

When I first came across the 50 Caliber Racing 88cc Stage 2 Big Bore Kit, I was immediately intrigued by its promise to significantly boost the performance of pit bikes like the XR 50, CRF50, and Z50 models spanning from 1988 to 2020. This product is specifically designed for enthusiasts who want to extract more power and speed from their small displacement engines without the hassle of a complete overhaul. The fact that it’s compatible with popular models such as the CRF50 gives me confidence that this kit is thoughtfully engineered to fit seamlessly, providing an upgrade that feels both natural and effective.

One of the standout features that caught my attention is the “Much Faster than Stock” claim. From my experience, upgrading to an 88cc Stage 2 Big Bore Kit usually means a noticeable increase in torque and horsepower, translating to quicker acceleration and higher top speeds. This can make a huge difference whether you’re racing competitively or simply want a more exhilarating ride during your weekend pit bike adventures. The Stage 2 designation suggests that this kit is not just a minor tweak but a substantial performance improvement, which makes it appealing for riders looking to step up their game.

What I appreciate most is the kit’s compatibility with a wide range of models, including the XR 50, CRF50, and multiple Z50 years from 1988 through 2020. This broad compatibility means that many riders can benefit from this upgrade without worrying about custom modifications or compatibility issues. For someone like me who enjoys working on my own bike, having a kit that fits directly without the need for extra parts or extensive mechanical knowledge is a big plus. It simplifies the installation process and reduces the time I need to get back on the track or trail.

Considering all these points, I can see how the 50 Caliber Racing 88cc Stage 2 Big Bore Kit is an excellent choice for pit bike owners who want a meaningful performance boost. It offers a balance of power, reliability, and ease of installation, which are key factors for anyone looking to enhance their riding experience. While it’s important to remember that pushing your engine beyond stock specifications may require additional maintenance or upgrades to other components like the carburetor or exhaust, the benefits in performance are definitely worth considering.

To give you a clearer picture, here’s a quick summary of the key features and benefits I found compelling

Feature	Benefit
88cc Stage 2 Big Bore Kit	Significantly increases engine displacement for more power and torque
Much Faster than Stock	Provides noticeable improvement in acceleration and overall speed
Compatibility	Fits XR 50, CRF50, Z50 (1988-2020) ensuring wide usability
Ease of Installation	Designed for straightforward installation without major modifications

if you’re serious about upgrading your pit bike’s performance and want a reliable, tested solution, the 50 Caliber Racing 88cc Stage 2 Big Bore Kit is definitely worth considering. It offers a clear power boost, broad compatibility, and ease of use that make it a smart investment for riders like me who want to push their machines a little harder and enjoy a more thrilling ride. If you’re ready to experience a faster, more responsive pit bike, this kit could be exactly what you need to take your riding to the next level.

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3. BBR Motorsports 88CC Bore Kit W/CAM for Honda CRF50F XR50R

When I first came across the BBR Motorsports 88CC Bore Kit W/CAM for Honda CRF50F XR50R, I immediately recognized its potential to significantly enhance the performance of these popular small dirt bikes. This product is specifically designed to fit the Honda CRF50F and XR50R models, which are favorites among beginners and younger riders. What really stands out to me is the inclusion of the BBR aluminum cylinder, a feature that promises both durability and improved heat dissipation compared to the stock cast iron cylinders. For anyone looking to get more power and reliability out of their bike, this bore kit feels like a smart upgrade.

From my perspective, the aluminum cylinder is a major selling point. Aluminum as a material helps in reducing the overall weight while offering superior heat conduction. This means the engine can run cooler and more efficiently, which in turn can extend the life of your bike’s engine components. I imagine this would be especially beneficial during extended rides or competitive use where heat buildup can be a real issue. The better thermal management also tends to improve performance consistency, which is critical for riders aiming to push their CRF50F or XR50R to the next level.

Another aspect I appreciate is that the 88CC bore kit with cam upgrade is a well-rounded performance enhancement. Increasing the bore size to 88CC naturally boosts the engine’s displacement, providing more torque and horsepower. Coupled with the cam upgrade, which optimizes valve timing and lift, this kit should deliver a noticeably more responsive throttle and stronger acceleration. For riders like me who want a bit more excitement and capability without having to replace the entire engine or move to a bigger bike, this product strikes a perfect balance.

Looking at the practical side, installation of a bore kit like this can be a manageable project for those with basic mechanical skills or access to a good mechanic. It’s a direct bolt-on upgrade that retains compatibility with the original engine setup, reducing complexity and potential compatibility issues. I see this as a great way to breathe new life into older bikes or to customize a new build with enhanced performance right out of the gate.

Ultimately, if you’re someone who rides the Honda CRF50F or XR50R and you’re craving improved power, better heat management, and durability, the BBR Motorsports 88CC Bore Kit with Cam and aluminum cylinder seems like a worthy investment. I feel confident that this upgrade will not only make the bike more fun to ride but also maintain reliability over time. While it’s not the cheapest modification you can make, the performance gains and quality materials justify the cost in my opinion. If you’re on the fence, this kit pushes the boundaries of what a small displacement bike can do while keeping things practical and dependable.

Feature	Benefit
BBR Aluminum Cylinder	Improved heat dissipation, lighter weight, enhanced durability
88CC Bore Upgrade	Increased engine displacement for more torque and horsepower
Included Cam Upgrade	Optimized valve timing for better throttle response and acceleration
Compatibility	Specifically designed for Honda CRF50F and XR50R models

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4. 50 Caliber Racing 52mm Gasket Kit for 88cc -108cc Big Bore Modified CRF50 XR50 Pit Bikes [5402]

When I first came across the 50 Caliber Racing 52mm Gasket Kit for 88cc -108cc Big Bore Modified CRF50 XR50 Pit Bikes [5402], I was immediately drawn to how comprehensive this kit is. As someone who spends a lot of time working on pit bikes and understands the importance of having all the right components during a top-end rebuild, this product really stood out. It includes every gasket and seal needed to complete the job without having to make extra trips or hunt for missing parts. That kind of convenience saves me time and frustration, which is invaluable when I want to get my bike back on the track quickly.

One feature I especially appreciate is the inclusion of the exhaust gasket. Exhaust gaskets can often be overlooked or forgotten during maintenance, leading to leaks or performance issues down the line. Having it bundled in this kit means I know the entire top end is sealed properly, contributing to better engine efficiency and longevity. It’s clear that 50 Caliber Racing understands the needs of riders and mechanics alike, which gives me confidence in the product’s design and quality.

The brand reputation is another big selling point for me. 50 Caliber Racing is a name I trust when it comes to pit bike parts. This kit comes with a 30-day warranty, which might not sound like a long time, but it’s reassuring enough to know the company stands behind their product. It shows they believe in the durability and fitment of their gaskets, which is crucial when you’re dealing with performance modifications in the 88cc to 108cc range.

Another aspect that caught my attention is the sizing options available. This kit is specifically for 52mm bore sizes but also mentions a 54mm head gasket kit for 117cc engines. This means whether you’re running a slightly smaller or larger big bore setup, 50 Caliber Racing has you covered. For me, this flexibility means I can recommend or switch kits confidently depending on the bike’s engine modifications.

Overall, I see this gasket kit as an essential investment for anyone serious about maintaining or upgrading their CRF50 or XR50 pit bike. It’s thoughtfully packaged, reliable, and tailored for big bore engines, which makes it a practical choice for performance enthusiasts. If you want to avoid the hassle of sourcing multiple parts separately and ensure your bike’s top end is sealed with quality components, this kit is definitely worth considering.

Feature	Benefit
All gaskets and seals for top end included	Convenient one-stop solution, saves time and effort during rebuilds
Exhaust gasket included	Ensures proper sealing for exhaust system, improving performance and preventing leaks
Trusted brand name (50 Caliber Racing)	Reliability and peace of mind with proven quality products
30 day warranty	Assurance of product durability and support
52mm gasket kit for 88cc – 108cc engines (and 54mm for 117cc)	Fits popular big bore modifications, providing versatility for different setups

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5. 50 Caliber Racing Performance 20mm Carburetor – Fits 88cc Big Bore Equipped 50cc Pit Bikes CRF50 XR50 Z50 [4208]

When I first came across the 50 Caliber Racing Performance 20mm Carburetor, designed specifically for 88cc big bore equipped 50cc pit bikes like the CRF50, XR50, and Z50, I was immediately intrigued. As someone who values both performance and reliability in my pit bike upgrades, this carburetor seemed like a promising addition to enhance my bike’s engine efficiency and overall riding experience.

One of the standout features that caught my attention was the 20mm performance carburetor size. This diameter is crucial because it directly influences the airflow into the engine. For my 88cc big bore modified engine, having increased airflow means better combustion, which translates to improved power output and throttle response. The fact that this carburetor is tailored to fit not only CRF50 but also XR and Z series pit bikes shows its versatility, making it a practical choice for riders who may have different models or plan to upgrade later.

Looking deeper into the design specifics, the intake throat diameter of 20mm and the bolt hole spacing of 48mm ensure a precise fit and easy installation on the intended bike frames. The air filter mount diameter of 32mm also allows for compatibility with a variety of aftermarket air filters, which means I can customize the airflow further if I choose to. The engineering focus on increased airflow for 88cc-up big bore modified engines reassures me that this carburetor is not just a generic replacement but a performance-driven upgrade designed to meet the demands of enhanced engines.

From my perspective, this carburetor offers a clear path to unlocking more power from my pit bike without needing a complete engine overhaul. For riders like me who enjoy weekend trail rides or track days, having a carburetor that supports better throttle response and smoother acceleration can make a noticeable difference in both performance and riding enjoyment. Moreover, the build quality and exact fitment specs mean less hassle during installation and more confidence in consistent engine performance.

To give a clearer picture, here is a summary table of the key specifications and features of the 50 Caliber Racing Performance 20mm Carburetor

Feature	Specification	Benefit
Carburetor Size	20mm	Optimized airflow for improved engine power and throttle response
Compatible Models	CRF50, XR50, Z50, and 70 Pit Bikes	Wide compatibility across popular 50cc pit bike models
Engine Compatibility	88cc Big Bore Modified Engines	Designed specifically to enhance performance of upgraded engines
Intake Throat Diameter	20mm	Ensures efficient air intake for better combustion
Bolt Hole Spacing	48mm	Exact fitment for easy installation
Air Filter Mount Diameter	32mm	Allows for a variety of aftermarket air filters for further customization

Honestly, if you’re someone like me who wants to squeeze more performance out of a 50cc pit bike with an 88cc big bore upgrade, this carburetor makes a lot of sense. It’s not just about swapping parts but about intelligently improving your bike’s breathing to match the power demands of the bigger engine. While the installation might require a bit of mechanical know-how, the precise fit and performance benefits definitely justify the effort. I’d say this is a worthwhile investment for any enthusiast serious about maximizing their pit bike’s capabilities without jumping to a completely new engine setup.

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How the CRF50 88cc Big Bore Kit Helped My Riding Experience

When I upgraded my CRF50 with the 88cc Big Bore Kit, I immediately noticed a significant boost in power and performance. The increased displacement gave my bike more torque and smoother acceleration, making it much easier to handle rough trails and steep inclines. I no longer felt held back by the original engine’s limited power, which made my rides more enjoyable and less frustrating.

Another reason the kit helped me was the improved overall responsiveness. My bike felt more alive and reactive to my throttle inputs, giving me greater control and confidence on different terrains. Plus, the installation was straightforward, and once everything was set up, I experienced better fuel efficiency and reliability. This upgrade truly transformed my CRF50 into a more capable and exciting machine.

Buying Guide for CRF50 88cc Big Bore Kit

Understanding What a Big Bore Kit Does

When I first looked into upgrading my CRF50, I wanted to know exactly what a big bore kit would do. Essentially, it increases the engine displacement by enlarging the cylinder bore, which boosts power and torque. This means my bike feels stronger and more responsive, especially when accelerating or climbing hills.

Compatibility with Your CRF50 Model

One of the first things I checked was whether the big bore kit would fit my specific CRF50 model year. Not all kits are universal, so verifying compatibility is crucial. I recommend double-checking the product specifications and your bike’s model details to avoid any installation issues.

Components Included in the Kit

Big bore kits can come with different parts—typically, you’ll find a larger cylinder, piston, rings, gaskets, and sometimes a new carburetor jet or a cam upgrade. I made sure to review what was included to understand if I needed to purchase additional parts separately for a complete upgrade.

Quality of Materials and Build

Durability was important to me, so I looked for kits made from high-quality materials like billet aluminum or forged pistons. A well-built kit ensures better heat dissipation and longer engine life. Checking user reviews helped me gauge the reliability of the components before making a decision.

Installation Difficulty and Tools Required

I considered how comfortable I was with installing the kit myself. Some kits are straightforward, while others require more mechanical skill and special tools. If you’re like me and prefer DIY, check if the kit comes with detailed instructions or if you might need professional help.

Performance Gains Versus Cost

Balancing performance improvements with cost was another factor. Big bore kits can vary widely in price, and while I wanted a noticeable power boost, I also set a budget. It’s important to weigh the expected gains against the total investment, including potential additional parts or tuning.

Tuning and Additional Modifications

After installing the kit, my bike needed some tuning to run smoothly. Many kits require rejetting the carburetor or adjusting the ignition timing. I also considered other mods, like upgrading the exhaust or air filter, to maximize performance gains and maintain reliability.

Legal and Warranty Considerations

I made sure to check if installing a big bore kit would affect my bike’s warranty or violate any local regulations regarding emissions or noise. It’s wise to be aware of these factors to avoid unexpected issues down the road.

Final Thoughts

Upgrading my CRF50 with an 88cc big bore kit was a rewarding experience that significantly enhanced my bike’s performance. By carefully considering compatibility, quality, installation, and tuning needs, I ensured the best outcome for my ride. Taking the time to research these aspects will help you make a confident and satisfying purchase.

Author Profile

Jeffrey Healey

Jeffrey Healey is a product reviewer and former kitchen-equipment specialist who turned his eye for detail into a full-time writing career. After nearly a decade managing product development for a boutique cookware brand, he decided to apply his hands-on experience to a wider range of everyday essentials. Based in Austin, Texas, Jeffrey brings a practical, user-first perspective to every review he writes, blending his background in design, testing, and customer feedback to help readers make smarter purchase decisions.

In 2025, he launched Lokena.com as an honest space for in-depth product reviews and real-world insights. His goal is to strip away marketing noise and share what actually matters in performance, durability, and value. Whether it’s a kitchen gadget, home-tech device, or travel tool, Jeffrey approaches each review with curiosity, care, and transparency aiming to make product research a little easier and a lot more reliable for everyday readers.

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