1. Motorcycle Cylinder Heads & Valve Covers For Sale
  2. sku: 13882397806952722
  3. BFO UNRO9S

BFO UNRO9S Cylinder Head Kit Performance 70CC 50CC

fits model: Crf70, Xr70, C70. make: Honda. year: 1970.

Unro9s Bfo Cylinder Head Complete Kit For Honda Crf70 Xr70 Ct 70 C70 70cc 50cc Performance

( Brand: Bfo ), ( Manufacturer Part Number: UNRO9S ), ( 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 Cylinder Head Complete Kit Honda Ct 50cc Performance fits CRF70 XR70 C70 1970

The BFO UNRO9S Cylinder Head Kit is an exceptional performance upgrade for Honda CRF70, XR70, C70, and 70cc/50cc models. This kit is designed to deliver improved power, torque, and overall engine performance, making it an ideal choice for riders seeking to take their off-road bikes to the next level.

The UNRO9S Cylinder Head Kit comes with a high-performance cylinder head that features improved port design and larger intake and exhaust valves. These design upgrades allow for increased air and fuel intake and more efficient exhaust gas expulsion, resulting in improved combustion efficiency and more power. The OEM-style head gasket and matching cylinder are included in the kit, ensuring a perfect fit and seal.

The kit also includes a set of high-performance pistons and rings. These pistons are made from a stronger material and feature a new design that provides increased compression and improved heat dissipation. The rings are also upgraded to provide better sealing and longevity.

The UNRO9S Cylinder Head Kit also includes a set of high-performance camshafts. These camshafts feature increased lift and duration, providing improved valve action and more power throughout the RPM range. The kit includes both intake and exhaust camshafts, as well as the necessary hardware to install them.

Additionally, the kit includes a set of high-performance spark plugs and a new cooling system cap. The spark plugs are designed to provide better ignition and longer lifespan, while the cooling system cap ensures proper cooling system function and Pressure.

The BFO UNRO9S Cylinder Head Kit is designed to be a direct replacement for the OEM cylinder head and components. It comes with all necessary hardware for installation, including new head bolts, valve springs, and retainers. The installation process is straightforward and can be completed with common hand tools, making it a great option for DIY riders.

In summary, the BFO UNRO9S Cylinder Head Kit is a high-performance upgrade for Honda CRF70, XR70, C70, and 70cc/50cc models. It includes a high-performance cylinder head, pistons and rings, camshafts, spark plugs, and a cooling system cap, all designed to provide improved power, torque, and overall engine performance. The kit is a direct replacement for OEM components and comes with all necessary hardware for installation.

A Detailed Analysis of the BFO UNRO9S Cylinder Head Kit for Honda CRF70, XR70, C70, 70cc, and 50cc Motorcycles: Weighing the Pros and Cons

Introduction:

The BFO UNRO9S Cylinder Head Kit is a popular upgrade for Honda CRF70, XR70, C70, 70cc, and 50cc motorcycles. This kit promises improved performance, power, and durability. However, like any other upgrade, it comes with its advantages and disadvantages. In this analysis, we will discuss the key pros and cons of investing in the BFO UNRO9S Cylinder Head Kit.

Pros:

1. Improved Performance: The UNRO9S Cylinder Head Kit provides better engine breathing and increased combustion efficiency, leading to enhanced power and torque.

2. Durability: The kit is made from high-quality materials, ensuring longevity and resistance to wear and tear.

3. Enhanced Cooling: The upgraded cylinder head design improves cooling efficiency, preventing overheating issues.

4. Increased Horsepower: The UNRO9S Cylinder Head Kit can help boost horsepower, making your bike faster and more responsive.

5. Better Fuel Efficiency: By improving engine performance, the kit can lead to better fuel efficiency and longer riding time between refills.

Cons:

1. Complex Installation: Installing the cylinder head kit can be a complex process, requiring professional assistance or extensive mechanical knowledge.

2. Cost: The UNRO9S Cylinder Head Kit is a premium upgrade, and its cost may deter some potential buyers.

3. Potential Compatibility Issues: Although the kit is designed for various Honda models, some users have reported compatibility issues.

4. Risk of Damage: The installation process carries the risk of damaging the engine or other components if not done correctly.

Conclusion:

The BFO UNRO9S Cylinder Head Kit offers significant advantages, including improved performance, enhanced cooling, increased horsepower, and better fuel efficiency. However, it also comes with some drawbacks, such as complex installation, potential compatibility issues, and a relatively high cost. If you are an experienced mechanic or willing to invest in professional assistance, the benefits of the UNRO9S Cylinder Head Kit may outweigh the cons. However, if you are new to motorcycle modifications or have a limited budget, it might be worth considering other upgrades or waiting until you have more experience before attempting this upgrade.

Recommendation:

For those considering the BFO UNRO9S Cylinder Head Kit, it is recommended to carefully weigh the pros and cons and consider your mechanical skills, budget, and riding goals. If you decide to proceed, it is crucial to obtain the correct kit for your specific motorcycle model and follow the installation instructions carefully. Additionally, it is advisable to seek professional assistance if you are unsure about any aspect of the installation process.

Details:

For Honda S65. This head will only work with DOMED pistons. For Honda TRX70.

This head will only work with FLAT TOP pistons. For Honda ATC70 1978-1985. Compare the Combustion Chamber Size shown below, to your current head. Cylinder Head for Honda CRF70 XR70 CT70 C70 ATC70 TRX70 S65 50cc Large Bore / 70cc Small.

specifications cylindermotorcycleiz:

  • for models: Crf70, Xr70, C70
  • for makes: Honda
  • for years: 1970
  • brand: Bfo
  • mpn: Unro9s
  • 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

payments cylindermotorcycleiz:

  • other
  • credit card: Discover
  • wallet: Paypal

shipping cylindermotorcycleiz:

  • service: FedEx Ground / FedEx Home Delivery
  • type: Fixed
  • transit: 3-7 Days
  • class: Standard
  • carrier: FedEx
  • cost: $0.00

returns cylindermotorcycleiz:

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

offer cylindermotorcycleiz:

  • availability: In Stock
  • options: Ship-to-home
  • sold: 0
  • best offers: True
  • started: March 16, 2026

seller cylindermotorcycleiz:

  • rating: 99.5%
  • city: Elk Grove Village, Illinois
  • # reviews: 22469

general cylindermotorcycleiz:

  • Motorcycle Scooter Parts Accessories > Engines Engine Parts > Cylinder Heads
  • condition: New
for models: crf70, xr70, c70, for makes: honda, for years: 1970, 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,
category: motorcycle parts > motorcycle scooter parts accessories > engines engine parts > cylinder heads, sku: 13882397806952722,
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