1. Pistons, Rings & Piston Kits Products
  2. sku: 12195391519082731
  3. BSA 65-809

BSA 65-809 Piston B31 11744 .020 616820

616820 Bsa 65-809 B31 Piston 11744 .020 Pat England Oem

( Brand: Bsa ), ( Manufacturer Part Number: 65-809 ), ( Type: Piston ), ( Vintage Part: Yes ), ( Country Of Origin: United Kingdom )

Review BSA B31 Piston .020 Pat England Oem

The BSA 65-809 B31 piston, part number 11744 020 616820, is a crucial component for the proper functioning of BSA motorcycle engines. Designed specifically for BSA engines, this piston boasts several key features that ensure reliable and efficient performance.

First and foremost, this piston is manufactured from high-quality materials. The piston crown is made from a strong and durable aluminum alloy, which provides excellent heat resistance and reduces weight. The piston skirt, on the other hand, is made from a robust steel material that ensures a secure fit within the cylinder bore.

The piston's design incorporates a compressive ring groove that houses four compression rings. These rings are essential for sealing the combustion gases within the engine cylinder, which in turn improves engine efficiency and power output. The piston also features an oil control ring, which helps to minimize oil consumption and ensures that the engine is lubricated evenly.

The piston's top ring groove is designed to accommodate a piston pin with a diameter of 13mm, and it is equipped with a piston pin retaining clip that securely holds the piston pin in place. The piston also includes a piston pin boss, which provides additional strength and stability to the piston assembly.

This BSA 65-809 B31 piston is specifically designed to fit in engines that require a piston with a bore size of 81mm and a stroke length of 90mm. It is important to note that using the incorrect piston size or type can lead to serious engine damage and decreased performance.

In summary, the BSA 65-809 B31 piston, part number 11744 020 616820, is a critical component for BSA motorcycle engines that demands high-performance and reliability. Its durable construction, advanced design features, and precise fit ensure that it delivers optimal engine efficiency, power output, and longevity.

The BSA 65-809 B31 piston 11744 020 616820 is a replacement part designed for use in BSA motorcycles. Here are some potential pros and cons of purchasing this piston:

Pros:

1. OEM (Original Equipment Manufacturer) part: This piston is manufactured by BSA, ensuring it is a perfect fit and match for your motorcycle model.

2. High Quality: BSA is known for producing high-quality motorcycle parts, and this piston is no exception.

3. Improved Engine Performance: A new piston can help improve engine performance and power output by ensuring a proper seal and reducing friction.

4. Reliable: A new piston can help increase the reliability and longevity of your engine by replacing a worn-out or damaged part.

Cons:

1. Cost: Replacement parts, especially from OEM manufacturers like BSA, can be expensive. This piston may be more costly than aftermarket alternatives.

2. Availability: Depending on your location and the availability of BSA parts, it may take some time to receive this piston.

3. Installation: Installing a new piston can be a complex and time-consuming process, requiring specialized tools and knowledge.

Conclusion:

The BSA 65-809 B31 piston 11744 020 616820 is a high-quality OEM replacement part that can help improve engine performance, reliability, and longevity. However, it comes with a higher cost compared to aftermarket alternatives and may take some time to receive. Moreover, the installation process can be complex and time-consuming. Ultimately, the decision to purchase this piston depends on your budget, availability, and technical expertise. If you prioritize a perfect fit and match for your motorcycle and are willing to invest in a high-quality part, then this piston is a worthwhile investment. If you are looking for a more cost-effective alternative, you may want to consider aftermarket pistons.

Details:

part #: 65809 price

  • $29.99

specifications pistondon:

  • brand: Bsa
  • mpn: 65-809
  • type: Piston
  • vintage part: Yes
  • country of origin: United Kingdom

seller pistondon:

  • city: De Ruyter, New York
  • rating: 100.0%
  • # reviews: 8538

general pistondon:

  • condition: Used
  • Motorcycle Scooter Parts Accessories > Engines Engine Parts > Pistons, Rings Piston Kits

shipping pistondon:

  • class: Standard
  • type: Fixed
  • service: USPS Ground Advantage
  • cost: $9.99
  • transit: 3-8 Days
  • carrier: USPS

offer pistondon:

  • sold: 0
  • availability: In Stock
  • started: May 4, 2026
  • options: Ship-to-home
  • best offers: True
  • quantity: 1

payments pistondon:

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

returns pistondon:

  • paid by: Buyer
  • policy: Returns Accepted
  • time: 14 Days
type: piston, vintage part: yes, country of origin: united kingdom,
category: motorcycle parts > motorcycle scooter parts accessories > engines engine parts > pistons, rings piston kits, sku: 12195391519082731,

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1 offer $29.99 USD
  • Offer #1: $29.99 price + $9.99 shipping estimate = $39.98* total. See photos. Used.+$9.99 shipping

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