YAMAHA B3J-14453-00-00 Airbox Intake Boot Filter Cage

( Manufacturer Part Number: B3J-14453-00-00 ), ( Part Type: Intake Boot Filter Cage )

Review YAMAHA Airbox Intake Boot Filter Cage Assembly fits YZ450FX 2020

The **Yamaha YZ450FX Airbox Intake Boot, Filter Cage, and Intake Boot Assembly (Part Number: B3J-14453-00-00, Model Year: 2020)** is a precision-engineered component designed to enhance the performance, reliability, and longevity of Yamaha s legendary YZ450FX motocross bike. This high-quality assembly plays a critical role in the bike s air intake system, ensuring optimal airflow while protecting the engine from debris, dust, and contaminants that could otherwise compromise performance or lead to premature wear. Crafted from durable, lightweight materials, the intake boot and filter cage are engineered to maintain a tight seal with the airbox, minimizing air leaks that could reduce horsepower and throttle response. The filter cage, in particular, securely holds the air filter in place, preventing shifting or displacement under high-G cornering or aggressive riding conditions, while the intake boot s flexible yet robust construction allows for smooth, unrestricted airflow even during extreme maneuvers. This assembly is a direct replacement for OEM parts, ensuring a perfect fit with the 2020 YZ450FX s airbox system, and is built to Yamaha s stringent quality standards, guaranteeing durability and performance consistency over thousands of miles. Whether used for track days, motocross competitions, or off-road adventures, this intake system upgrade helps riders extract maximum power while maintaining engine protection, making it an essential component for those seeking both performance and reliability in their Yamaha YZ450FX.

The Yamaha YZ450FX airbox intake boot, filter cage, and filter assembly (part numbers B3J-14453-00-00, released in 2020) are aftermarket components designed to improve airflow and performance in Yamaha s YZ450FX motocross bike. Below is a detailed breakdown of their pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Enhanced Airflow and Performance**

The primary benefit of these components is improved airflow into the engine. The stock airbox on the YZ450FX is often criticized for being restrictive, leading to reduced power and throttle response. The aftermarket intake boot, filter cage, and filter are designed to create a more direct and efficient airflow path, which can result in better acceleration, smoother power delivery, and increased horsepower. Many riders report noticeable gains in mid-range and top-end performance, especially when paired with a high-quality filter.

2. **Easier Installation and Maintenance**

The B3J-14453-00-00 kit is designed to be a drop-in replacement for the stock airbox components. It typically comes with clear instructions and is engineered to fit seamlessly with the bike s existing airbox setup. This makes installation relatively straightforward, even for riders who are not mechanically inclined. Additionally, the filter is often more accessible for cleaning or replacement compared to the stock setup, which can be cumbersome.

3. **Compatibility with Other Modifications**

The YZ450FX is a popular bike for tuning, and these airbox components are often used in conjunction with other modifications such as exhaust systems, camshafts, or fueling upgrades. The improved airflow from this kit can complement other performance enhancements, allowing the engine to breathe better and handle increased power more effectively.

4. **Durability and Quality**

Yamaha s aftermarket parts are generally well-built and designed to meet the demands of motocross riding. The materials used in the intake boot, filter cage, and filter are robust enough to withstand the rigors of off-road use, including dirt, debris, and high-speed impacts. The filter itself is often made from high-quality foam or cotton, which can provide better filtration while still allowing adequate airflow.

5. **Cost-Effective Performance Upgrade**

Compared to more extensive engine modifications, such as porting the cylinder head or installing a full custom airbox, this kit offers a relatively inexpensive way to improve performance. The cost is often justified by the noticeable gains in power and throttle response, making it a popular choice among riders looking to enhance their bike s performance without a significant investment.

6. **Reduced Backpressure**

The stock airbox on the YZ450FX can create backpressure, which restricts airflow and reduces engine efficiency. The aftermarket components are designed to minimize this backpressure, allowing the engine to draw in more air more efficiently. This can lead to better combustion, improved fuel economy, and reduced engine strain during hard riding.

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### **Cons**

1. **Potential for Reduced Filtration**

While the primary goal of these components is to improve airflow, some riders and mechanics argue that the aftermarket filter may not provide the same level of filtration as the stock filter. This could lead to more dirt and debris entering the engine over time, potentially causing wear or damage to the cylinder walls, pistons, or other internal components. However, this risk can be mitigated by regularly cleaning or replacing the filter and ensuring the bike is ridden in clean conditions.

2. **Increased Risk of Engine Damage**

If the filter is not cleaned or replaced regularly, or if the bike is ridden in extremely dirty conditions, the increased airflow could allow more abrasive particles into the engine. Over time, this can lead to accelerated wear on the piston rings, cylinder walls, or other critical components. Riders who frequently ride in dusty or muddy conditions may need to be more diligent about maintenance to avoid this issue.

3. **Potential for Voiding Warranty**

Yamaha s factory warranty may be voided if aftermarket airbox components are installed, especially if the bike is still under warranty. This is because the installation of non-OEM parts is often considered a modification that could affect the bike s performance or reliability. Riders should check their warranty terms before proceeding with the installation.

4. **Compatibility Issues**

While the B3J-14453-00-00 kit is designed to be compatible with the 2020 YZ450FX, there is always a small risk of fitment issues. For example, the intake boot or filter cage might not align perfectly with the airbox, leading to gaps or leaks that could reduce airflow efficiency. Riders should carefully follow the installation instructions and double-check for proper sealing.

5. **Limited Performance Gains for Some Riders**

The performance improvements from this kit may vary depending on the rider s riding style, the condition of the bike, and other factors such as the quality of the filter used. Some riders may not notice significant gains, especially if the bike is already well-tuned or if the filter is not cleaned regularly. Additionally, riders who primarily ride in light or casual conditions may not see as much benefit as those who push the bike hard in competition or aggressive riding.

6. **Potential for Increased Oil Consumption**

In some cases, improved airflow can lead to increased oil consumption, particularly if the bike is ridden hard or if the piston rings are worn. This is not a direct result of the airbox components themselves but rather a side effect of the engine running more efficiently. Riders should monitor their oil levels and top up as needed to avoid engine damage.

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### **Conclusion**

The Yamaha B3J-14453-00-00 airbox intake boot, filter cage, and filter assembly for the 2020 YZ450FX is a well-regarded aftermarket upgrade that offers significant benefits in terms of airflow, performance, and ease of installation. The kit is designed to address the shortcomings of the stock airbox, providing riders with better throttle response, increased power, and smoother power delivery. Its durability, compatibility with other modifications, and cost-effectiveness make it a popular choice among Yamaha owners.

However, there are some potential drawbacks to consider, including the risk of reduced filtration, potential engine damage if maintenance is neglected, and the possibility of voiding the factory warranty. Riders should weigh these factors carefully and ensure they are prepared to maintain the bike properly to avoid any negative consequences.

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### **Recommendation**

For riders looking to enhance the performance of their 2020 YZ450FX without a major investment, the B3J-14453-00-00 airbox kit is a strong recommendation. It is a relatively simple and effective upgrade that can provide noticeable gains in power and responsiveness. To maximize the benefits and minimize risks, riders should:

1. **Use a High-Quality Filter**: Pair the kit with a reputable aftermarket filter, such as a K&N or Yoshimura, which offers better filtration while still allowing adequate airflow.

2. **Regular Maintenance**: Clean or replace the filter regularly, especially if the bike is ridden in dirty or dusty conditions. This will help prevent debris from entering the engine and causing wear.

3. **Check Warranty Terms**: Before installation, review Yamaha s warranty policy to ensure that the modification does not void coverage. Some riders opt to remove the aftermarket parts before returning the bike for warranty service.

4. **Monitor Engine Health**: Keep an eye on oil consumption and overall engine performance. If oil levels drop too quickly or if there are signs of excessive wear, address the issue promptly.

5. **Consider Other Modifications**: If performance gains are still desired after installing the airbox kit, consider pairing it with other upgrades such as a high-flow exhaust or camshafts, but ensure the bike is properly tuned to handle the increased power.

In summary, the B3J-14453-00-00 kit is a worthwhile upgrade for most YZ450FX riders, provided they are committed to proper maintenance and aware of the potential trade-offs. For those who prioritize performance and are willing to invest time in upkeep, this kit is an excellent choice.

Details:

I am more than happy to send you specific pictures upon request. Some parts, especially electronics, may be shipped with deliberate paint markings or security stickers. If you are looking for expedited shipping, or combined contact me PRIOR to purchase the easiest buying experience. Inspect and replace if necessary.

2020 Yamaha YZ450FX. I can not guarantee the age, quality or longevity of these used wear parts. Items come as pictured. Air filter looks used and may need replaced.

The exact item you see in the photographs is same are receiving. I also have a video of the bike starting and running for assurance as well. I rode the bike for about 2 hours and was able to ensure all systems on were in good working order. I always recommend when buying a suspension, motor or brake component to inspect and replace any wear parts if deemed necessary.

The same applies to any bearings/seals/gaskets. Has the backfire screen cut out it appears. These parts likely fit many different years/ model's. If you re unsure of fitment, message me with your make model and year I may be able to help point you in the right direction.

Please review all posted photos carefully. All parts were personally removed from a good running 2022 Yamaha YZ450FX with 136 hours on it according to the CCU.

part #: b3j144530000 prices

• $44.99-$45.00

specifications intakefuelmotorcycle:

• for models: Yz450fx
• for makes: Yamaha
• for years: 2020
• mpn: B3j-14453-00-00
• part type: Intake Boot Filter Cage

seller intakefuelmotorcycle:

• rating: 99.9%
• # reviews: 993
• city: Pottsville, Pennsylvania

payments intakefuelmotorcycle:

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general intakefuelmotorcycle:

• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery
• condition: Used

shipping intakefuelmotorcycle:

• carrier: USPS
• transit: 4-8 Days
• type: Calculated
• service: USPS Ground Advantage
• class: Standard
• cost: $17.75

offer intakefuelmotorcycle:

• availability: In Stock
• started: April 9, 2026
• options: Ship-to-home
• quantity: 1
• sold: 0

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• policy: No Returns

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