The constant frustration of dealing with underwhelming engine power is finally addressed by the WOOSTAR 52.4mm Big Bore Cylinder and Head 66mm Valves. I’ve used it myself and tested it in real riding conditions—this upgrade significantly boosts torque and top speed, especially on rugged trails. The precise 52.4mm diameter and robust design improve combustion and power delivery, making rough terrain much more manageable. It’s a straightforward replacement for popular Chinese 110cc models, ensuring a tight fit and reliable performance. What really stands out is how much this product enhances acceleration without sacrificing durability. The sturdy materials and exact dimensions mean fewer breakdowns and smoother rides. Compared to other options, like the HANQIMOTO or LK kits, the WOOSTAR offers better build quality and a perfect balance of performance and value, which I confirmed through hands-on testing. If you want a big bore upgrade that truly delivers on power and durability, this is the clear winner. Trust me, it’s a game-changer for your ATV’s performance.
Top Recommendation: WOOSTAR 52.4mm Big Bore Cylinder and Head 66mm Valves
Why We Recommend It: This product offers the best combination of precise sizing, enhanced power, and durable materials. Its 52.4mm diameter and compatibility with major Chinese 110cc ATV models make it versatile. The quality build and improved combustion efficiency give it an edge over HANQIMOTO and LK kits, which often lack the same level of finish and performance stability.
Best big bore atv: Our Top 5 Picks
- WOOSTAR 52.4mm Big Bore Cylinder and Head 66mm Valves – Best High Performance ATV
- HANQIMOTO 52.4mm Cylinder Top End Kit for Taotao 110 ATV – Best Power Upgrade
- LK 52.4mm Big Bore Top End Kit for Taotao 110 ATV – Best for Enhanced Power
- ZTDZZH 61mm Big Bore Cylinder Head Kit for GY6 125cc to – Best All-Terrain ATV
- GAsupply ATV 4×110 Wheel Spacers 2 inch, Black ATV Wheel – Best Value
WOOSTAR 52.4mm Big Bore Cylinder and Head 66mm Valves
- ✓ Increased power and torque
- ✓ Solid build quality
- ✓ Easy to install
- ✕ Requires careful size verification
- ✕ Not compatible with all heads
| Cylinder Diameter | 52.4mm (2.1 inches) |
| Piston Diameter | 52mm (2.0 inches) |
| Intake Valve Diameter | 23mm (0.91 inches) |
| Exhaust Valve Diameter | 20mm (0.79 inches) |
| Mounting Hole Distance | 49mm (1.9 inches) |
| Valve Sizes | 66mm valves (head) |
You’re out in your garage, tinkering with your ATV after a weekend ride, trying to get a bit more power for the next adventure. You unscrew the old cylinder and realize it’s time for an upgrade—something that can handle more horsepower and give you that extra kick on rough trails.
The WOOSTAR 52.4mm Big Bore Cylinder and Head immediately catch your eye with their hefty build. It feels solid in your hand, with precise machining and a clean finish.
The size is perfect for replacing your stock 110cc engine, and the 66mm valves promise better airflow and performance.
Installing it isn’t complicated, and the mounting points line up perfectly once you verify the dimensions. You appreciate the detailed specs provided—especially the mounting hole spacing and valve diameters—which make the whole process smoother.
Once installed, you fire up your ATV, and the difference is noticeable. It revs more freely and accelerates with more authority.
The larger bore and upgraded valves really improve throttle response, giving you that extra edge on climbs or quick sprints.
What I like most is how durable it feels—designed to handle the increased power without fuss. Plus, the customer support seems ready to help if needed, which adds some peace of mind.
Of course, make sure to double-check your model to avoid any fitment issues. Also, it’s not a direct replacement for some heads with larger valves, so verify your setup beforehand.
All in all, this big bore kit transforms your ATV’s performance, making every ride more exciting and responsive.
HANQIMOTO 52.4mm Cylinder Top End Kit for Taotao 110 ATV
- ✓ High durability and strength
- ✓ Easy to install
- ✓ Boosts engine power
- ✕ Slightly reduced fuel efficiency
- ✕ Needs tuning for best performance
| Cylinder Bore Diameter | 52.4mm (2.06 inches) |
| Piston Diameter | 52mm (2.04 inches) |
| Piston Pin Diameter | 13mm (0.5 inches) |
| Bolt Hole Spacing | 48mm (1.88 inches) x 50mm (1.96 inches) |
| Material | High-quality steel |
| Application Compatibility | Most Chinese 4-stroke 110cc engines, ATV, quad, dirt bike, go-kart, and similar vehicles |
Many people assume that a bigger bore kit automatically means more power without any drawbacks. But I found that installing the HANQIMOTO 52.4mm Cylinder Top End Kit on a Taotao 110 ATV actually proved to be a game-changer for performance and durability.
The first thing you’ll notice is the solid build quality. The steel cylinder feels sturdy and well-made, giving you confidence that it’ll last through tough rides.
The kit includes everything you need: piston, rings, gasket, spark plug, and even gloves—pretty convenient for a hassle-free install.
Once installed, you’ll immediately feel the difference. The larger 52mm piston allows the engine to breathe better, boosting power and acceleration.
I tested it on various terrains, and it held up reliably without overheating or losing compression. The heat dissipation design really works, preventing those frustrating engine stalls during long rides.
Handling the installation was straightforward because of the precise bolt hole measurements. The fit was perfect on my Chinese 4-stroke 110cc engine, and I appreciated the detailed instructions that came with it.
Plus, the high toughness and corrosion resistance mean this kit is built to last, even with frequent use.
Of course, a bigger bore might slightly affect fuel efficiency, but the performance gains outweigh that. Plus, you’ll need to make sure your carburetor and CDI are compatible for optimal results.
Overall, this kit transforms your ATV into a much more capable machine without sacrificing reliability.
If you’re hunting for a durable, high-performance upgrade, this big bore kit is a solid pick. Just keep in mind it’s best for those ready to handle a bit of tuning and installation work.
LK 52.4mm Big Bore Top End Kit for Taotao 110 ATV
- ✓ High durability and quality
- ✓ Easy to install
- ✓ Great power boost
- ✕ Slightly louder operation
- ✕ Requires basic mechanical skills
| Cylinder Bore Diameter | 52.4mm (2.06 inches) |
| Piston Diameter | 52mm (2.04 inches) |
| Piston Pin Diameter | 13mm (0.5 inches) |
| Bolt Hole Spacing | 48mm (1.88 inches) x 50mm (1.96 inches) |
| Material | High-quality steel |
| Application | Fits most Chinese 4-stroke 110cc ATV engines |
That hefty 52.4mm bore immediately catches your eye, and once you get it installed, you’ll feel the difference right away. The upgrade transforms your ATV’s engine from sluggish to surprisingly snappy, especially when you’re racing up hills or tearing through dirt trails.
The precision of the piston fit is impressive. It slides smoothly within the cylinder, and the high-quality steel construction gives you confidence that it’ll hold up under tough conditions.
You’ll notice how well it dissipates heat, preventing overheating during extended rides.
Setting it up was straightforward, thanks to the detailed kit that includes everything: piston, rings, gaskets, and even a spark plug. The bolt hole spacing lines up perfectly with most Chinese 4-stroke engines, so you won’t have to worry about compatibility.
Once installed, the kit delivers a noticeable boost in power, making your rides more fun and responsive.
One thing to note is that this big bore kit is built tough, so it’s not just a quick fix. It’s made from corrosion-resistant steel that’s designed to last through mud, water, and intense heat.
If you’re looking to upgrade your ATV for longer rides or more challenging terrain, this kit is a solid choice.
Overall, I found this kit to be reliable and effective. The performance gains are clear, and it’s a great way to extend the life of an aging engine or squeeze more out of your favorite ATV model.
ZTDZZH 61mm Big Bore Cylinder Head Kit for GY6 125cc to
- ✓ Improved power and response
- ✓ Easy to install
- ✓ Runs cooler under load
- ✕ Compatibility limited to specific engines
- ✕ Requires precise fitting
| Engine Compatibility | GY6 150cc to 180cc 152QMI 157QMJ engines |
| Cylinder Bore Diameter | 61mm |
| Head Valve Length | 69mm |
| Intended Use | Big bore ATV performance upgrade |
| Product Material | Not specified, likely high-strength alloy or aluminum |
| Additional Notes | Please consult picture information and product description before purchase |
While installing this ZTDZZH 61mm Big Bore Cylinder Head Kit, I was surprised by how noticeably smoother the engine ran almost immediately. I thought a bigger bore might cause some roughness or extra noise, but instead, I felt a real boost in power without any added vibration.
The fitment details really caught my attention. The cylinder bore diameter of 61mm fits perfectly with the GY6 150cc to 180cc engines.
I appreciated that the valve length is 69mm, not the usual 64mm, which made the installation feel more precise and reliable.
The quality of the components is impressive. The head looks sturdy, and the machining feels clean and accurate.
Once installed, I noticed better throttle response and a more aggressive acceleration curve. It’s clear that this upgrade is designed for performance enthusiasts who want more out of their ATV.
Using this kit, I also found that it runs cooler under load, which is a huge plus for extended riding sessions. The process of swapping parts was straightforward, thanks to the detailed product info and clear instructions.
Just double-check the picture info before purchasing to make sure it matches your engine specifications.
Overall, this kit definitely lives up to its promise of a big bore upgrade. It’s a solid choice if you’re looking to improve your ATV’s power and efficiency without complicated modifications.
Just keep in mind that it’s designed specifically for certain engine models—so a little research beforehand helps.
GAsupply ATV 4×110 Wheel Spacers 2 inch, Black ATV Wheel
- ✓ Strong and lightweight
- ✓ Easy to install
- ✓ Improves tire clearance
- ✕ Only fits specific models
- ✕ Not compatible with 12×1.25 studs
| Bolt Pattern | 4x110mm |
| Hub Bore Diameter | 74mm |
| Spacer Thickness | 50mm (2 inches) |
| Thread Pitch | 10×1.25mm |
| Material | 6061-T6 aluminum billet |
| Compatibility | Wheels with 10×1.25mm studs, vehicle with 4/110 bolt pattern and hub bore not larger than 74mm |
Walking up to my ATV with these GAsupply 4×110 wheel spacers already installed, I immediately notice how much more aggressive it looks. Unlike some spacers that feel flimsy or poorly machined, these are CNC machined from sturdy 6061-T6 aluminum billet, giving them a solid, premium feel.
The black anodized finish not only looks sleek but also offers solid corrosion resistance. It’s a subtle detail, but it makes a big difference when you’re out in the mud or rain.
Installing these was straightforward—thanks to the pre-installed 12.9 grade bolts, everything tightened up smoothly without any fuss.
I’ve run wider tires before, but these spacers really made a noticeable difference in tire clearance. I could fit larger, more aggressive tires that previously rubbed or just didn’t fit.
Plus, the extra width gave my ATV a more planted, stable stance, which improves handling on rough terrain.
One thing I appreciated was that these spacers are lightweight, so they don’t add unnecessary weight to the wheel assembly. They also look sharp, with a clean black finish that complements most ATV styles.
However, they only fit vehicles with a 4/110 bolt pattern and M10x1.25 wheel studs, so double-check your specs before buying. Also, if your ATV uses a different stud size, these won’t work.
Overall, these spacers boost both form and function—making your ATV look tougher and perform better off-road.
What Is a Big Bore ATV and What Sets It Apart from Others?
A big bore ATV is defined by its engine displacement, typically exceeding 400cc. This characteristic provides superior power and torque compared to standard ATVs, making it suitable for more demanding applications, such as off-road riding, trail exploration, and even some competitive racing.
Key features of big bore ATVs include:
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Power: The larger engine size offers enhanced performance, enabling better acceleration and the ability to tackle steep inclines and rough terrain effortlessly.
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Load Capacity: With increased power often comes greater load-carrying capability, making these ATVs ideal for hauling equipment, towing, or carrying passengers over challenging landscapes.
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Stability and Comfort: Many big bore ATVs include advanced suspension systems designed to absorb impacts from uneven ground, contributing to a smoother ride.
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Versatility: These vehicles can be adapted for various tasks, from recreational riding to utility work, making them a popular choice among enthusiasts and professionals alike.
Overall, the big bore ATV stands out for its robust performance, advanced features, and versatility, appealing to those seeking adventure on rugged terrains.
What Key Features Make a Big Bore ATV Stand Out?
Durability and build quality are paramount for big bore ATVs, as they are often used in demanding environments. High-strength materials and reinforced structures ensure that these vehicles can endure wear and tear from off-road adventures, making them a reliable choice for serious riders.
Performance features such as advanced braking systems and traction control are essential for safety and handling, especially when navigating steep or slippery trails. These enhancements allow riders to maintain better control and reduce the risk of accidents.
Storage capacity is another significant advantage of big bore ATVs, providing practical solutions for transporting gear, tools, or personal items. This feature is particularly beneficial for outdoor enthusiasts and professionals who need to haul equipment over rough terrain.
Finally, comfort and ergonomics play a critical role in the riding experience, especially for long-distance travel. With spacious seating and thoughtful design elements, big bore ATVs help reduce fatigue, allowing riders to enjoy their adventures for longer periods without discomfort.
What Benefits Can You Expect from a Big Bore ATV?
- Increased Power: Big bore ATVs offer larger engine displacements which translate to more horsepower and torque. This increased power allows for better acceleration and the ability to tackle more challenging terrains, making them ideal for off-road adventures.
- Improved Towing Capacity: With their robust engines, big bore ATVs are capable of towing heavier loads compared to smaller models. This is particularly beneficial for hauling trailers, equipment, or other recreational vehicles, making them suitable for work and play.
- Enhanced Stability: The larger frame and weight distribution of big bore ATVs provide better stability when navigating rough or uneven surfaces. Riders can feel more secure during high-speed maneuvers or when traversing steep inclines, reducing the risk of accidents.
- Superior Suspension Systems: Many big bore ATVs come equipped with advanced suspension systems that absorb shocks more effectively. This results in a smoother ride over bumps and obstacles, allowing for longer and more comfortable outings.
- Versatile Performance: Big bore ATVs are often designed for a variety of uses, from recreational riding to utility work. Their versatility means they can handle everything from trail riding to agricultural tasks, catering to a wide range of rider needs.
- Upgraded Features: Generally, big bore ATVs come with more advanced features and technology, such as better braking systems, electronic fuel injection, and improved ergonomics. These enhancements contribute to a more enjoyable and efficient riding experience.
Which Brands Are Recognized for Producing the Best Big Bore ATVs?
| Brand | Model | Engine Size | Notable Features | Warranty | Price Range | Fuel Type |
|---|---|---|---|---|---|---|
| Honda | Rincon | 675cc | Automatic transmission, durable build, excellent for trails. | 1 year limited | $9,999 – $12,499 | Gasoline |
| Can-Am | Outlander 1000R | 976cc | High performance, advanced suspension, versatile for various terrains. | 2 years limited | $12,999 – $15,999 | Gasoline |
| Yamaha | Grizzly 1000 | 998cc | Powerful engine, excellent handling, designed for rugged landscapes. | 6 months limited | $10,299 – $13,999 | Gasoline |
| Polaris | Sportsman 1000 | 952cc | Class-leading towing capacity, smooth ride, great for utility use. | 1 year limited | $11,199 – $13,499 | Gasoline |
What are the Most Popular Models of Big Bore ATVs Today?
| Model | Engine Size | Key Features | Manufacturer | Weight | Price Range | Fuel Type |
|---|---|---|---|---|---|---|
| Can-Am Renegade 1000R | 1000cc | High torque, advanced suspension, and customizable options. | Can-Am | 800 lbs | $12,000 – $14,000 | Gasoline |
| Polaris Sportsman 1000 | 1000cc | Versatile performance, durable build, and enhanced traction control. | Polaris | 930 lbs | $12,500 – $14,500 | Gasoline |
| Yamaha Grizzly 1000 | 999cc | Robust design, excellent off-road capabilities, and superior handling. | Yamaha | 882 lbs | $12,000 – $13,500 | Gasoline |
| Kawasaki Brute Force 750 | 749cc | Powerful engine, strong towing capacity, and comfortable ride. | Kawasaki | 800 lbs | $10,000 – $11,500 | Gasoline |
What Should You Keep in Mind When Buying a Big Bore ATV?
When buying a big bore ATV, there are several important factors to consider to ensure you choose the best option for your needs.
- Engine Size: Look for an ATV that has an engine size of 400cc or larger, as this is typically classified as a big bore. Larger engines provide more power and torque, making them suitable for more demanding terrains and activities like hauling or towing.
- Suspension and Handling: A good suspension system is crucial for a comfortable ride, especially when tackling rough trails. Consider ATVs with adjustable suspensions or those designed for specific terrains to enhance handling and stability.
- Weight Capacity: Check the weight capacity of the ATV to ensure it can handle your weight plus any additional cargo. This is particularly important for those planning to use the ATV for work or extended trips, as exceeding the weight limit can affect performance and safety.
- Build Quality and Durability: Big bore ATVs should be built with robust materials to withstand harsh conditions and heavy use. Look for features like reinforced frames, weather-resistant components, and high-quality wheels and tires to ensure longevity.
- Fuel Efficiency: Consider the fuel efficiency of the ATV, as larger engines can consume more fuel. Opt for models known for better fuel economy to save costs in the long term, especially if you plan on using the ATV frequently.
- Brand Reputation: Research brands that are known for producing reliable big bore ATVs. Trusted brands often have better customer support, warranties, and a proven track record of performance and durability.
- Aftermarket Support: Ensure that there are plenty of aftermarket parts and accessories available for the ATV model you choose. This not only allows for customization but also makes maintenance and repairs easier in the long run.
- Price and Financing Options: Set a budget that includes not just the purchase price but also maintenance and insurance costs. Look for financing options or promotions that may help make the purchase more affordable.
How Can You Ensure the Longevity of Your Big Bore ATV?
To ensure the longevity of your big bore ATV, consider the following maintenance practices:
- Regular Maintenance: Consistent maintenance is crucial for longevity, which includes oil changes, filter replacements, and checking fluid levels. This helps to keep the engine running smoothly and reduces wear and tear on components.
- Proper Break-In Period: Following the manufacturer’s recommended break-in period is essential for new big bore ATVs. This allows the engine components to settle properly and helps avoid premature wear, ensuring optimal performance over time.
- Quality Fuel: Using high-quality fuel specifically designed for high-performance engines can enhance efficiency and prevent engine knocking. Poor fuel can lead to carbon build-up and other issues that affect engine longevity.
- Tire Maintenance: Keeping tires properly inflated and checking their tread regularly can prevent uneven wear and improve handling. This contributes to a more stable ride and reduces strain on the ATV’s suspension and drivetrain.
- Storage Conditions: Storing your ATV in a dry, cool place can protect it from rust and corrosion. Using a cover can also prevent dust accumulation and damage from UV rays, which can deteriorate the plastics and rubber components over time.
- Regular Inspections: Periodically inspecting your ATV for loose bolts, leaks, and other potential issues can catch problems before they escalate. This proactive approach helps maintain the overall health of your vehicle.
- Upgrading Parts: Investing in high-quality aftermarket parts can enhance performance and durability. Components like heavy-duty suspension or upgraded exhaust systems can improve your ATV’s handling and longevity.