1. Motorcycle Cylinder Heads & Valve Covers For Sale
  2. sku: 14266386536403741
  3. BFO U91VFD

BFO U91VFD Cylinder Head 70CC ATC70

fits model: Crf70, Ct70, C70, Trx70, Xr70, S65. make: Honda.

U91vfd Bfo 70cc Cylinder Head Assembly For Honda Atc70 Crf70 Ct70 C70 Trx70 Xr70 S65

( Brand: Bfo ), ( Manufacturer Part Number: U91VFD ), ( 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 CRF70 CT70 C70 TRX70 XR70 S65

BFO U91VFD 70CC Cylinder Head for Honda ATC70 CRF70 CT70 C70 TRX70 XR70 S65

The BFO U91VFD 70CC Cylinder Head is a high-performance replacement part designed specifically for Honda ATC70, CRF70, CT70, C70, TRX70, XR70, and S65 models. This cylinder head is an excellent upgrade for riders seeking enhanced power and durability for their off-road vehicles.

This cylinder head features a 70CC displacement and is constructed from top-quality aluminum alloy, ensuring lightweight yet robust performance. The OEM-designed structure ensures a perfect fit and seamless integration with your Honda engine.

The BFO U91VFD cylinder head comes with a pre-machined deck surface and pre-drilled bolt holes, making installation quick and hassle-free. This design also guarantees optimal combustion chamber volume and precise alignment, ensuring optimal engine performance.

The cylinder head includes new, high-performance exhaust valves and intake ports, allowing for improved gas flow and increased power output. The valves are designed using advanced materials for superior strength and durability, ensuring they can withstand the rigors of off-road riding.

The BFO U91VFD cylinder head is also equipped with high-performance pistons that offer improved compression ratio and increased power. These pistons are machined to the highest tolerances to ensure a perfect fit and optimal engine performance.

This cylinder head comes with new, high-performance head gaskets that are compatible with the latest engine designs. These gaskets provide a strong seal between the engine block and cylinder head, ensuring optimal engine performance and preventing coolant leaks.

In summary, the BFO U91VFD 70CC Cylinder Head is an excellent upgrade for Honda ATC70, CRF70, CT70, C70, TRX70, XR70, and S65 models. It offers increased power output, durability, and improved engine performance, making it an essential addition for any off-road enthusiast seeking to enhance their vehicle's capabilities.

Buying a BFO U91VFD 70cc cylinder head for a Honda ATV model such as the CRF70, CT70, C70, TRX70, or XR70 S65 can have several pros and cons that are important to consider before making a purchase. Here are some potential advantages and disadvantages:

Pros:

1. Increased Power: The BFO cylinder head is designed to provide more power and torque, which can make your ATV faster and more responsive.

2. Improved Performance: The upgraded cylinder head can improve the overall performance of your ATV, making it more enjoyable to ride.

3. Durability: The BFO cylinder head is made from high-quality materials, which can make it more durable and longer-lasting than the stock cylinder head.

4. Better Fuel Efficiency: Some customers have reported improved fuel efficiency with the BFO cylinder head, which can save you money in the long run.

Cons:

1. Cost: The BFO cylinder head can be quite expensive, which may be a deterrent for some buyers.

2. Installation Complexity: Installing the BFO cylinder head can be a complex process, which may require the assistance of a professional mechanic or significant mechanical knowledge and experience.

3. Potential Compatibility Issues: It's important to ensure that the BFO cylinder head is compatible with your specific Honda ATV model. Incorrect installation can lead to damage to the engine or other components.

4. Increased Noise: Some customers have reported an increase in engine noise with the BFO cylinder head, which may be a concern for those who prefer a quieter ride.

Conclusion:

The decision to buy a BFO U91VFD 70cc cylinder head for your Honda ATV depends on several factors, including your budget, mechanical expertise, and desired performance improvements. While the potential for increased power, improved performance, and durability are attractive benefits, the cost, installation complexity, potential compatibility issues, and increased noise are important considerations. Ultimately, if you're looking for a significant performance upgrade and have the budget and mechanical expertise to install it yourself, the BFO cylinder head may be worth considering. However, if you're on a tight budget or prefer a quieter ride, it may be best to stick with the stock cylinder head.

Recommendation:

Before making a purchase, be sure to do thorough research to ensure that the BFO U91VFD 70cc cylinder head is compatible with your specific Honda ATV model and that you have the necessary mechanical expertise to install it. Additionally, consider the potential benefits and drawbacks carefully to determine if the investment is worth it for your specific riding needs and preferences. It may also be helpful to consult with a professional mechanic or Honda dealer for their recommendations and advice.

Details:

This head will only work with FLAT TOP pistons. 70cc Cylinder Head Assembly for Honda ATC70 CRF70 CT70 C70 TRX70 XR70 S65. For Honda TRX70. For Honda S65.

This head will only work with DOMED pistons. Quick, Simple. Always the correct part.guaranteed Fitment.

Manufacturer. Compare the Combustion Chamber Size shown below, to your current head. Fast Shipping. Cylinder Head for Honda CRF70 XR70 CT70 C70 ATC70 TRX70 S65 50cc Large Bore / 70cc Small.

part #: u91vfd prices

  • $35.31-$67.99

specifications cylindermotorcycleiz:

  • for models: Crf70, Ct70, C70, Trx70, Xr70, S65
  • for makes: Honda
  • brand: Bfo
  • mpn: U91vfd
  • 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

payments cylindermotorcycleiz:

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

shipping cylindermotorcycleiz:

  • cost: $0.00
  • type: Fixed
  • carrier: FedEx
  • class: Standard
  • transit: 3-5 Days
  • service: FedEx Ground / FedEx Home Delivery

offer cylindermotorcycleiz:

  • best offers: True
  • started: May 10, 2026
  • sold: 0
  • options: Ship-to-home
  • quantity: 11
  • availability: In Stock

seller cylindermotorcycleiz:

  • rating: 99.8%
  • city: Elk Grove Village, Illinois
  • # reviews: 1920

returns cylindermotorcycleiz:

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

general cylindermotorcycleiz:

  • Motorcycle Scooter Parts Accessories > Engines Engine Parts > Cylinder Heads
  • condition: New
for models: crf70, ct70, c70, trx70, xr70, s65, for makes: honda, 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,
category: motorcycle parts > motorcycle scooter parts accessories > engines engine parts > cylinder heads, sku: 14266386536403741,
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5 offers $35.31–$67.99 USD
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