PRO CIRCUIT 19CRF450EK-1 Engine CRF450R/RX FT17-20

( Brand: Pro Circuit ), ( Manufacturer Part Number: 19CRF450EK-1 ), ( Type: Engine Package ), ( Vintage Part: No ), ( Performance Part: Yes )

Review PRO CIRCUIT Engine Package Crf450r/rx fits CRF450R RX

Introducing the Pro Circuit 19CRF450EK-1 Engine for CRF450R/RX models from 2017 to 2020, an exceptional upgrade for your off-road motorcycle. This high-performance engine is designed to deliver improved power, torque, and responsiveness, enhancing the overall riding experience.

The Pro Circuit 19CRF450EK-1 engine is a rebuilt and ported CRF450R/RX engine, featuring a complete top end overhaul, including new CRF450R piston, rings, and cylinder head. The engine comes with a high-performance Pro Circuit camshaft and valve springs, which increase engine RPM and provide better valve control for improved power and torque.

This engine upgrade includes a Pro Circuit performance airbox, which allows for a freer-flowing intake system, providing the engine with more air for greater power and improved throttle response. Furthermore, the Pro Circuit 19CRF450EK-1 engine includes a high-flow exhaust system, which reduces backpressure and enhances exhaust gas flow, resulting in increased power and torque.

The Pro Circuit 19CRF450EK-1 engine also features a new clutch assembly with a lightweight clutch basket and heavy-duty clutch plates, ensuring smoother and more consistent engagement for better power transfer to the rear wheel. This engine upgrade also includes a Pro Circuit high-performance CDI ignition system, which provides a stronger spark for improved combustion efficiency and better throttle response.

The Pro Circuit 19CRF450EK-1 engine is also compatible with the factory EFI system, ensuring easy installation and integration with your motorcycle's existing fuel injection system. This engine upgrade is perfect for riders looking to gain an edge on the competition, with increased power and torque, improved throttle response, and a more responsive engine for better performance on the track or trail.

In conclusion, the Pro Circuit 19CRF450EK-1 engine is a high-performance upgrade for CRF450R/RX models from 2017 to 2020, featuring a rebuilt and ported engine, high-performance camshaft and valve springs, a performance airbox, a high-flow exhaust system, a new clutch assembly, and a high-performance CDI ignition system. This engine upgrade delivers increased power, torque, and responsiveness, making it the perfect choice for riders looking to take their motorcycle to the next level.

The Pro Circuit 19CRF450EK-1 engine, which is used in CRF450R/RX models from 2017-2020, is a high-performance aftermarket engine option for those seeking to enhance the power and overall riding experience of their motorcycle. Here are some pros and cons of buying this engine.

1. Increased Power: The Pro Circuit engine delivers more power than the stock Honda CRF450R/RX engine. This translates to faster acceleration and improved top speed, making the bike more fun and responsive to ride.

2. Improved Durability: The Pro Circuit engine features a number of upgrades designed to improve durability. For example, it has a heavier crankshaft, stronger connecting rods, and improved piston rings. This can help extend the lifespan of the engine and reduce the need for costly repairs.

3. Enhanced Performance: The Pro Circuit engine has a number of performance upgrades, such as a high-performance camshaft, ported cylinder head, and high-flow air filter. These upgrades can help improve throttle response, power delivery, and overall engine efficiency.

4. Better Fit and Finish: The Pro Circuit engine is specifically designed to fit and work seamlessly with the CRF450R/RX frame and chassis. This can help ensure a smooth installation process and a better overall riding experience.

1. Cost: The Pro Circuit engine is more expensive than the stock Honda engine. This can be a significant investment for some riders.

2. Complexity: Installing the Pro Circuit engine is a more complex process than installing a stock engine. It requires specialized tools and knowledge, which can add to the overall cost and time involved.

3. Potential for Issues: As with any aftermarket engine, there is a risk of encountering issues or problems that may require additional repairs or modifications. This can add to the overall cost and time involved in owning and maintaining the bike.

In conclusion, the Pro Circuit 19CRF450EK-1 engine is an excellent option for those seeking to enhance the power and performance of their CRF450R/RX motorcycle. Its durability upgrades and high-performance components make it a worthwhile investment for serious riders. However, its higher cost, complexity, and potential for issues are important considerations to keep in mind before making a purchase. Ultimately, the decision to buy a Pro Circuit engine depends on your budget, riding style, and level of mechanical expertise. If you are willing to invest the time, money, and effort required to install and maintain the engine, it can provide a significant performance boost and help take your riding experience to the next level.

Recommendation: If you are a serious off-road rider looking for maximum power and performance from your CRF450R/RX, the Pro Circuit 19CRF450EK-1 engine is a strong recommendation. Its durability upgrades, high-performance components, and seamless fit with the CRF450R/RX frame and chassis make it an excellent choice for those seeking to push their motorcycle to its limits. However, it is important to carefully consider the cost, complexity, and potential for issues before making a purchase. If you are unsure about your ability to install and maintain the engine, it may be worth considering other aftermarket engine options or seeking the help of a professional mechanic.

Details:

Newest Pro Circuit cam design for CRF450R/RX. Improved throttle response and overall engine performance. Fits model's: Honda CRF450R 2017 2020. Boosts low-end torque and high-RPM performance.

Includes:: High-Compression Piston Kit. Designed to maintain precise valve control. Race-Proven quality from Pro Circuit. Built using advanced manufacturing technology.

Pro Circuit is known for delivering championship-winning engine components, and this kit built to offer significant power gains across the entire RPM range. Allows higher RPM operation without valve float. Perfect for riders looking improved low-end torque, stronger mid-range pull, and increased top-end power whether on the motocross track or off-road. Manufactured by JE Pistons to Pro Circuit specifications.

Components engineered to work together. Matches the camshaft for maximum performance. Optimized valve lift Profile for increased power. Honda CRF450RX 2017 2020.

Brand New Pro Circuit Engine Performance Package Honda CRF450R / CRF450RX 2017 2020. Best results when paired with Pro Circuit Valve Springs. Designed specifically to work together as a complete system, this package includes High-Compression Piston Kit, Camshaft, and Valve Springs. Key Benefits:: Significant horsepower and torque gains.

part #: 19crf450ek1 price

• $1299.99

specifications rockeareng:

• for models: Crf450r, Rx
• brand: Pro Circuit
• mpn: 19crf450ek-1
• type: Engine Package
• vintage part: No
• performance part: Yes

payments rockeareng:

• other
• wallet: Apple-pay
• credit card: Diners-club

shipping rockeareng:

• carrier: UPS
• cost: $13.24
• class: Standard
• transit: 3-10 Days
• type: Calculated
• service: UPS Ground

returns rockeareng:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted

seller rockeareng:

• rating: 100.0%
• city: Mooresville, North Carolina
• # reviews: 769

general rockeareng:

• Engines Engine Parts > Valvetrain Components > Rocker Arms Parts
• condition: New

offer rockeareng:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• started: November 18, 2025
• quantity: 1
• best offers: True

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