1. Motorcycle Cylinder Heads & Valve Covers For Sale
  2. sku: 12954396903760722
  3. BFO YM3D9B

BFO YM3D9B Cylinder Head Kit Performance 70CC 50CC

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

Ym3d9b Bfo Cylinder Head Complete Kit For Honda Crf70 Xr70 Ct 70 C70 70cc 50cc Performance

( Brand: Bfo ), ( Manufacturer Part Number: YM3D9B ), ( 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

BFO YM3D9B Cylinder Head Kit for Honda CRF70, XR70, C70, and 70cc/50cc Models

The BFO YM3D9B Cylinder Head Kit is a high-performance upgrade designed specifically for the Honda CRF70, XR70, C70, and 70cc/50cc models. This kit is an excellent choice for riders seeking improved engine performance, durability, and reliability.

The cylinder head in this kit features a redesigned combustion chamber, providing increased compression ratio and improved combustion efficiency. The new design allows for more efficient fuel burn, resulting in a more potent power output. The kit also includes new, high-performance exhaust valves, which facilitate better exhaust flow and enhance engine breathing.

The BFO YM3D9B Cylinder Head Kit is manufactured using premium materials, ensuring long-lasting performance and durability. The cylinder head is made from high-strength aluminum alloy, which is both lightweight and robust. This material resists warping and cracking under the rigors of off-road riding, ensuring a consistent fit and reliable sealing.

The kit includes all necessary hardware and gaskets for a straightforward installation. The gaskets are precision-machined to ensure a perfect seal, eliminating the need for lengthy engine disassembly. The installation process is designed to be as simple as possible, allowing riders to quickly upgrade their engines with minimal downtime.

The BFO YM3D9B Cylinder Head Kit is an excellent investment for riders seeking to extract maximum performance from their Honda CRF70, XR70, C70, or 70cc/50cc models. This kit not only enhances power output but also improves engine reliability and durability, ensuring a more enjoyable and rewarding off-road experience. Upgrade your engine today with the BFO YM3D9B Cylinder Head Kit.

Buying a BFO YM3D9B cylinder head kit for a Honda CRF70, XR70, C70, or 70cc/50cc model can offer several potential benefits and drawbacks for performance enthusiasts. Here's a brief analysis of each:

Benefits:

1. Enhanced Power: This kit is designed to provide improved power output, making your Honda CRF70 more responsive and faster. This can be a significant advantage for off-road racing or trail riding.

2. Improved Cooling: The BFO cylinder head kit comes with a larger cooling fin design, which can help your engine run cooler and more efficiently, reducing the risk of overheating.

3. Better Flow: The kit includes a high-performance intake and exhaust port design, which can improve the flow of air and fuel into the engine, leading to better combustion and increased power.

Drawbacks:

1. Complex Installation: Installing a cylinder head kit requires advanced mechanical skills and experience. Additionally, the process can be time-consuming and may require specialized tools.

2. Cost: The cost of purchasing and installing a cylinder head kit can be high. While the kit itself may not be expensive, the labor and parts required for installation can add up quickly.

3. Risk of Damage: Installing a cylinder head kit incorrectly can result in significant damage to your engine, potentially requiring expensive repairs.

Conclusion:

The decision to purchase and install a BFO YM3D9B cylinder head kit for your Honda CRF70 depends on your individual needs and priorities. If you're an experienced mechanic looking for maximum power and performance, this kit may be a worthwhile investment. However, if you're not confident in your mechanical skills or have a limited budget, it may be better to stick with stock parts or consider other upgrades.

Recommendation:

Before making a purchase, weigh the benefits and drawbacks carefully and consider seeking the advice of a experienced mechanic or Honda dealership. If you do decide to proceed, make sure to use a reputable supplier and follow all installation instructions carefully to minimize the risk of damage.

Details:

For Honda ATC70 1978-1985. For Honda S65. Cylinder Head for Honda CRF70 XR70 CT70 C70 ATC70 TRX70 S65 50cc Large Bore / 70cc Small.

This head will only work with FLAT TOP pistons. Compare the Combustion Chamber Size shown below, to your current head. This head will only work with DOMED pistons. For Honda TRX70.

specifications cylindermotorcycleiz:

  • for models: Crf70, Xr70, C70
  • for makes: Honda
  • for years: 1970
  • brand: Bfo
  • mpn: Ym3d9b
  • 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

returns cylindermotorcycleiz:

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

shipping cylindermotorcycleiz:

  • service: FedEx Ground / FedEx Home Delivery
  • class: Standard
  • cost: $0.00
  • transit: 5-9 Days
  • carrier: FedEx
  • type: Fixed

general cylindermotorcycleiz:

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

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offer cylindermotorcycleiz:

  • availability: In Stock
  • sold: 0
  • options: Ship-to-home
  • started: November 9, 2025
  • best offers: True

seller cylindermotorcycleiz:

  • city: Rowland height, California
  • # reviews: 21251
  • rating: 99.2%
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: 12954396903760722,
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