1. Pistons, Rings & Piston Kits Products
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  3. BSA 41-251

BSA 41-251 Nos Piston Rings 46/10-66 79MM

fits model: B40.

41-251 Bsa Nos- Vintage B40 Piston With Rings 46/10-66 H 79mm

( Brand: Bsa ), ( Manufacturer Part Number: 41-251 ), ( Type: Piston ), ( Items Included: Piston Rings ), ( Vintage Part: Yes )

Review BSA Nos Vintage Piston Rings 46/10-6679mm fits B40

BSA 41-251 NOS B40 Piston Rings - 46/10-66, 79mm

Description:

The BSA 41-251 NOS B40 Piston Rings are original equipment manufacturer (OEM) replacement parts designed specifically for BSA motorcycles. These piston rings are part number 46/10-66 and are sized at 79mm. They are newly old stock (NOS), meaning they have been newly manufactured using the original blueprint specifications and have never been used before.

These BSA piston rings are made from high-quality materials, ensuring optimal performance and durability. The rings are designed to fit snugly into the piston grooves and create a tight seal to prevent the combustion gases from escaping. This seal is crucial for the efficient transfer of power from the engine to the wheels.

The BSA 41-251 NOS B40 Piston Rings come as a complete set, including both compression and oil control rings. The compression rings are responsible for sealing the combustion chamber and transmitting the engine's power to the crankshaft. The oil control rings, on the other hand, prevent oil from entering the combustion chamber during the compression stroke.

Installing these piston rings requires some mechanical knowledge and experience. The process involves removing the old piston rings, cleaning the cylinder walls, and installing the new rings. It's essential to follow the manufacturer's instructions carefully to ensure a proper installation and avoid any damage to the engine or piston.

These BSA 41-251 NOS B40 Piston Rings are an ideal solution for motorcyclists who want to maintain the originality and authenticity of their BSA motorcycle while ensuring optimal performance. They are an excellent investment for anyone looking to restore a classic BSA motorcycle or keep their existing one in top condition.

In conclusion, the BSA 41-251 NOS B40 Piston Rings are high-quality OEM replacement parts designed for BSA motorcycles. They are newly manufactured using original blueprint specifications and come as a complete set for 79mm pistons. These rings are essential for maintaining the engine's efficiency and power transfer while preserving the authenticity of your BSA motorcycle.

BSA 41-251 NOS B40 piston rings with a size of 46/10-66 and an outside diameter of 79mm are replacement parts for BSA motorcycles. These piston rings are new old stock (NOS), meaning they are original equipment manufacturer (OEM) parts that have been newly manufactured and have never been installed on a motorcycle before. Here are some pros and cons of buying these BSA piston rings:

Pros:

1. OEM Quality: These piston rings are manufactured by the original equipment manufacturer, ensuring they meet the exact specifications and quality standards for BSA motorcycles.

2. Reliability: Replacing worn or damaged piston rings with new ones can help improve engine performance and reliability.

3. Long-Lasting: New piston rings should last longer than worn or damaged ones, helping to reduce the need for future replacements.

4. Availability: NOS parts like these BSA piston rings can be difficult to find, but they offer the advantage of being a direct fit for the motorcycle.

Cons:

1. Cost: OEM parts like these BSA piston rings can be more expensive than aftermarket alternatives.

2. Complex Installation: Installing piston rings can be a complex and time-consuming process that requires specialized tools and knowledge.

3. Limited Use: These piston rings can only be used for BSA motorcycles with the same specifications.

Conclusion:

BSA 41-251 NOS B40 piston rings with a size of 46/10-66 and an outside diameter of 79mm are high-quality replacement parts for BSA motorcycles. They offer the advantage of being a direct fit and meeting the exact specifications and quality standards of the original equipment manufacturer. However, they can be more expensive than aftermarket alternatives and require specialized tools and knowledge for installation. If you own a BSA motorcycle and need new piston rings, these OEM parts may be the best option for ensuring optimal engine performance and reliability.

Recommendation:

If you own a BSA motorcycle and need new piston rings, it is recommended that you consider purchasing the BSA 41-251 NOS B40 piston rings with a size of 46/10-66 and an outside diameter of 79mm. These OEM parts offer the advantage of being a direct fit and meeting the exact specifications and quality standards of the original equipment manufacturer. While they may be more expensive than aftermarket alternatives, they can help improve engine performance and reliability, making them a worthwhile investment for BSA motorcycle owners.

Details:

NOS- Vintage BSA B40 Piston w/Rings 46/10-6679mm Part # 41-251BSA, parts and packaging if any, may be dirty, rusty, showing signs of age. Please refer to all pictures for condition of part.

part #: 41251 prices

  • $45.00-$60.00

specifications pistondon:

  • for models: B40
  • brand: Bsa
  • mpn: 41-251
  • type: Piston
  • items included: Piston Rings
  • vintage part: Yes

payments pistondon:

  • wallet: Paypal
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  • credit card: Visa

seller pistondon:

  • city: Dade City, Florida
  • rating: 99.8%
  • # reviews: 1361

shipping pistondon:

  • service: USPS First Class
  • class: Standard
  • cost: $8.00
  • transit: 3-7 Days
  • carrier: USPS
  • type: Fixed

general pistondon:

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

returns pistondon:

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

offer pistondon:

  • quantity: 1
  • options: Ship-to-home
  • sold: 0
  • best offers: True
  • started: October 22, 2025
  • availability: In Stock
for models: b40, type: piston, items included: piston rings, vintage part: yes,
category: motorcycle parts > motorcycle scooter parts accessories > engines engine parts > pistons, rings piston kits, sku: 8582635326961752,

Bsa 41-251 Is Similar To:

pistondon logo
2 offers $45.00–$60.00 USD
  • Offer #1: $60.00 price + $6.58 shipping estimate = $66.58* total. BSA B40 +.10 Piston Bare NOS 41-0573, no rings, pin, or clips.+$6.58 shipping
  • Offer #2: $45.00 price + $8.00 shipping estimate = $53.00* total.+$8.00 shipping

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