BFO 59AR3S Cylinder Head 70CC ATC70 72CM3

( Brand: Bfo ), ( Manufacturer Part Number: 59AR3S ), ( Bundle Listing: Yes ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Compatible Make: For Honda ), ( Compatible Model: Atc70 Crf70 Ct70 C70 Trx70 Xr70 S65 ), ( Engine: 50cc, 70cc ), ( Engine Type: 4-stroke ), ( Exhaust Valve Outside Diameter: 20mm ), ( Fit 1: For Honda 50cc Large Bore ), ( Fit 2: For Honda 70cc Small Bore Cylinder ), ( Fit For: For Domed 50cc Or Flat Top 70cc ), ( Including: Cylinder Head ), ( Inner Bore Size: 39mm ), ( Intake Valve Outside Diameter: 23mm ), ( Items Included: Gasket ), ( Length: 66mm ), ( Machine Type: Off-road Motorcycle, Street Motorcycle ), ( Note: No Instruction Included ), ( Notice: This Is Aftermarket Replcement Part. ), ( Outer Bore Size: 47mm ), ( Quantity: As The Picture Show ), ( Vehicle Type: Motorcycle )

Review BFO 70cc Cylinder Head Assembly Honda fits CT70 TRX70 CRF70 XR70

Introducing the BFO 59AR3S 70cc Cylinder Head, a high-performance upgrade for your Honda ATV model, including the ATC70, CT70, TRX70, CRF70, and XR70 with a 72cm3 engine size. This cylinder head is meticulously engineered to enhance power output, improve engine efficiency, and deliver a thrilling riding experience.

The BFO 59AR3S cylinder head boasts a larger intake and exhaust port design, allowing for superior gas flow and increased combustion efficiency. The larger ports reduce restriction, enabling more air and fuel to enter the engine, resulting in a more potent power stroke. This translates to a noticeable increase in horsepower and torque, making your ATV quicker and more responsive.

The cylinder head features a high-performance combustion chamber design that optimizes fuel-air mixture and promotes efficient combustion. The increased compression ratio not only enhances power output but also results in a more fuel-efficient engine. This design is essential for riders seeking improved performance and reduced fuel consumption.

To ensure reliable and durable performance, the BFO 59AR3S cylinder head is made from high-quality aluminum alloy. The material's lightweight property reduces the overall weight of the engine, contributing to better handling and maneuverability. Additionally, the aluminum alloy provides excellent heat dissipation properties, keeping the engine running cooler and reducing the risk of engine damage.

The cylinder head comes with pre-installed, high-performance valves and springs, ensuring optimal engine performance right out of the box. The valves are made from durable, heat-resistant material, while the springs provide the correct valve clearance for optimal engine operation.

This BFO cylinder head is a direct bolt-on replacement for the stock unit, ensuring a seamless installation process. The cylinder head comes with all necessary hardware, making it an easy and convenient upgrade for your Honda ATV.

In summary, the BFO 59AR3S 70cc Cylinder Head is a high-performance upgrade for your Honda ATV engine. With its larger intake and exhaust ports, high-performance combustion chamber design, and durable construction, this cylinder head enhances power output, improves engine efficiency, and delivers a more exhilarating riding experience.

The BFO 59AR3S 70cc cylinder head is a aftermarket upgrade for Honda ATV models including the ATC70, CT70, TRX70, CRF70, and XR70 with a 72cm3 engine size. Here are some pros and cons to consider before making a purchase:

1. Increased Power: This cylinder head is designed to provide more power and better performance by increasing the engine displacement from 66.4cc to 70cc.

2. Durability: The cylinder head is made from high-quality materials, which can withstand the rigors of off-road riding.

3. Improved Throttle Response: The cylinder head design allows for improved throttle response, making the engine more responsive and easier to control.

4. Increased Top Speed: With the increased power, you can expect to achieve higher top speeds on your ATV.

1. Cost: The BFO 59AR3S 70cc cylinder head can be quite expensive, especially when compared to the cost of a stock cylinder head.

2. Installation Complexity: Installing this cylinder head can be a complex process and may require professional assistance.

3. Fuel Consumption: The increased power and displacement can lead to higher fuel consumption, which may result in additional costs.

4. Emissions: The increased power and displacement may result in higher emissions, which could be a concern for those who are environmentally conscious.

The BFO 59AR3S 70cc cylinder head is an excellent upgrade for those who want to improve the performance of their Honda ATV. It provides increased power, durability, improved throttle response, and higher top speeds. However, it comes with a high cost, installation complexity, increased fuel consumption, and higher emissions. Ultimately, the decision to purchase this cylinder head depends on your budget, riding style, and priorities.

If you are an aggressive rider who wants to push the limits of your ATV and are willing to invest in a high-performance upgrade, then the BFO 59AR3S 70cc cylinder head is an excellent choice. However, if you are on a tight budget or prefer a more fuel-efficient and environmentally-friendly ATV, then you may want to consider other upgrades or hold off on this purchase. It is recommended to consult with a professional mechanic before making a decision to ensure a successful installation and optimal performance.

Details:

Compare the Combustion Chamber Size shown below, to your current head.guaranteed Fitment. Manufacturer. This head will only work with DOMED pistons.

Always the correct part. Cylinder Head for Honda CRF70 XR70 CT70 C70 ATC70 TRX70 S65 50cc Large Bore / 70cc Small. For Honda ATC70 1978-1985. Fast Shipping.

For Honda TRX70. For Honda S65. This head will only work with FLAT TOP pistons. Quick, Simple.

part #: 59ar3s prices

• $19.99-$83.25

specifications cylindermotorcycleiz:

• for models: Ct70, Trx70, Crf70, Xr70
• for makes: Honda
• brand: Bfo
• mpn: 59ar3s
• bundle listing: Yes
• california prop 65 warning: California Prop 65 Warning
• compatible make: For Honda
• compatible model: Atc70 Crf70 Ct70 C70 Trx70 Xr70 S65
• engine: 50cc, 70cc
• engine type: 4-stroke
• exhaust valve outside diameter: 20mm
• fit 1: For Honda 50cc Large Bore
• fit 2: For Honda 70cc Small Bore Cylinder
• fit for: For Domed 50cc Or Flat Top 70cc
• including: Cylinder Head
• inner bore size: 39mm
• intake valve outside diameter: 23mm
• items included: Gasket
• length: 66mm
• machine type: Off-road Motorcycle, Street Motorcycle
• note: No Instruction Included
• notice: This Is Aftermarket Replcement Part.
• outer bore size: 47mm
• quantity: As The Picture Show
• vehicle type: Motorcycle

offer cylindermotorcycleiz:

• availability: In Stock
• quantity: 10
• options: Ship-to-home
• started: September 7, 2025
• sold: 0
• best offers: True

shipping cylindermotorcycleiz:

• service: FedEx Ground / FedEx Home Delivery
• cost: $0.00
• carrier: FedEx
• type: Fixed
• class: Standard
• transit: 3-6 Days

seller cylindermotorcycleiz:

• city: Elk Grove Village, Illinois
• # reviews: 580
• rating: 99.3%

returns cylindermotorcycleiz:

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

general cylindermotorcycleiz:

• condition: New
• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Cylinder Heads

payments cylindermotorcycleiz:

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

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