BFO AD3QNB Cylinder Head 70CC ATC70 72CM3

( Brand: Bfo ), ( Manufacturer Part Number: AD3QNB ), ( Bundle Listing: Yes ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Compatible Make: For Honda ), ( Compatible Model: Atc70 Crf70 Ct70 C70 Trx70 Xr70 S65 ), ( Country Of Origin: China ), ( 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 AD3QNB 70cc Cylinder Head, a top-tier replacement option for Honda ATC70, CT70, TRX70, CRF70, and XR70 models with a 72cm3 engine size. This cylinder head is meticulously engineered to provide superior performance, reliability, and longevity for your off-road motorcycle.

The BFO AD3QNB 70cc Cylinder Head is constructed using high-quality materials and advanced manufacturing processes. It features a durable, forged aluminum cylinder head block that ensures excellent heat dissipation and resistance to wear and tear. The head gasket is precision-machined to guarantee a perfect seal and minimize the risk of combustion leaks.

This cylinder head is designed with optimized ports and combustion chamber geometry for enhanced gas flow and more efficient combustion. This results in increased power output, better fuel economy, and improved engine response. The head also comes with new, upgraded exhaust valves that provide better flow characteristics and improved performance.

The BFO AD3QNB 70cc Cylinder Head is also compatible with various aftermarket performance parts, enabling you to customize your engine for even greater power and torque. The cylinder head is easy to install, with a straightforward bolt-on design that minimizes the need for extensive engine disassembly.

This upgrade is an excellent investment for any Honda ATV or dirt bike enthusiast looking to boost the performance of their machine. Whether you're a weekend warrior or a competitive racer, the BFO AD3QNB 70cc Cylinder Head is an essential upgrade that will give you the edge you need to tackle any terrain with confidence.

In summary, the BFO AD3QNB 70cc Cylinder Head is a meticulously engineered and high-performance upgrade for Honda ATC70, CT70, TRX70, CRF70, and XR70 models with a 72cm3 engine size. It offers enhanced power output, improved fuel economy, and superior reliability, making it an excellent investment for any off-road motorcycle enthusiast.

The BFO AD3QNB 70cc cylinder head is a popular aftermarket option for various Honda models including the ATC70, CT70, TRX70, CRF70, and XR70 with a 72cm3 engine size. Here are some pros and cons to help you make an informed decision about purchasing this cylinder head:

1. Enhanced Performance: This cylinder head is designed to provide improved performance, including increased horsepower and torque.

2. Durability: The BFO AD3QNB cylinder head is made from high-quality materials and is known for its durability, which can help reduce the frequency of engine replacements.

3. Better Thermal Efficiency: The cylinder head has a design that improves thermal efficiency, which can help the engine run cooler and more efficiently.

4. Easy Installation: Many users report that the cylinder head is easy to install, which can save time and money.

1. Cost: The BFO AD3QNB cylinder head can be more expensive than OEM (original equipment manufacturer) options.

2. Potential for Compatibility Issues: While this cylinder head is compatible with many Honda models, there is a risk of compatibility issues with specific engines or models.

3. Requires Additional Parts: In some cases, installing this cylinder head may require additional parts, such as new gaskets or seals.

The BFO AD3QNB 70cc cylinder head can be a worthwhile investment for Honda owners looking to improve the performance and durability of their engines. However, it is important to carefully consider the potential costs and compatibility issues before making a purchase.

Before purchasing the BFO AD3QNB 70cc cylinder head, it is recommended to thoroughly research its compatibility with your specific Honda model and engine size. Additionally, it may be a good idea to consult with a professional mechanic or Honda dealer to ensure a successful installation and to determine if this cylinder head is the best option for your needs and budget.

Details:

G guaranteed Fitment. Compare the Combustion Chamber Size shown below, to your current head. Quick, Simple. Fast Shipping.

For Honda S65. Always the correct part. This head will only work with DOMED pistons. For Honda ATC70 1978-1985.

Manufacturer. This head will only work with FLAT TOP pistons. Cylinder Head for Honda CRF70 XR70 CT70 C70 ATC70 TRX70 S65 50cc Large Bore / 70cc Small. For Honda TRX70.

part #: ad3qnb prices

• $19.99-$47.59

specifications cylindermotorcycleiz:

• for models: Ct70, Trx70, Crf70, Xr70
• for makes: Honda
• brand: Bfo
• mpn: Ad3qnb
• bundle listing: Yes
• california prop 65 warning: California Prop 65 Warning
• compatible make: For Honda
• compatible model: Atc70 Crf70 Ct70 C70 Trx70 Xr70 S65
• country of origin: China
• 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

seller cylindermotorcycleiz:

• # reviews: 1883
• city: Elk Grove Village, Illinois
• rating: 99.6%

shipping cylindermotorcycleiz:

• transit: 2-4 Days
• type: Fixed
• service: FedEx Ground / FedEx Home Delivery
• class: Standard
• cost: $0.00
• carrier: FedEx

returns cylindermotorcycleiz:

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

offer cylindermotorcycleiz:

• sold: 0
• availability: In Stock
• started: May 19, 2026
• options: Ship-to-home
• best offers: True

payments cylindermotorcycleiz:

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

general cylindermotorcycleiz:

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

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