DRAG SPECIALTIES 139661 Piston Set Compression 3-7/16 8.5

( Brand: Drag Specialties ), ( Manufacturer Part Number: 139661 ), ( Part Type: Piston Compression ), ( Warranty Details: See Manufacturer )

Review DRAG SPECIALTIES Piston Set 3-7/16 Inch Bore 8.5 Compression Ratio Harley Davidson #139661 fits DS

The 139661 DS Piston Set from Harley-Davidson is a premium replacement option for Harley riders seeking top performance and durability for their engines. These pistons are engineered specifically for Harley-Davidson V-Twin engines with a bore size of 3-7/16 inches and a compression height of 8.5 inches.

These pistons are crafted from a high-strength forged aluminum alloy, ensuring superior strength and reliability. The piston skirts are designed with a honed finish for a perfect seal with the cylinder wall, reducing friction and enhancing power delivery. The piston crowns are optimized for the Harley-Davidson ignition system, providing efficient combustion and even power distribution.

Each piston features a unique design with a distinctive dome shape that enhances air flow and cooling, reducing the risk of detonation and engine knock. The piston rings are precision-machined for a perfect fit and optimal sealing, ensuring efficient compression and minimizing blow-by.

The 139661 DS Piston Set includes all the necessary hardware for installation, including new piston pins and piston pin bushings. The pistons come pre-assembled with the rings installed, making installation a straightforward process for even the most novice of mechanics.

With the 139661 DS Piston Set, Harley-Davidson riders can expect improved engine performance, enhanced power delivery, and increased durability. These pistons are the perfect upgrade for riders seeking to maximize the potential of their Harley-Davidson V-Twin engine.

Overall, the 139661 DS Piston Set is a high-quality, precision-engineered component that delivers superior performance and reliability for Harley-Davidson riders. Whether you're looking to upgrade your stock pistons or seeking a replacement option after wear and tear, this piston set is an excellent choice for any Harley-Davidson V-Twin engine.

Pros and Cons of Buying a 139661 DS Piston Set for Harley-Davidson with 3-7/16 inches bore and 8.5:1 compression

a. Improved Performance: Upgrading to a higher compression piston set can lead to increased horsepower and torque, resulting in better overall engine performance.

b. Durability: DS pistons are known for their high-quality materials and robust design, which can withstand the rigors of heavy usage, providing a longer service life.

c. Customization: This piston set is suitable for certain Harley-Davidson engines, allowing riders to tailor their engine's characteristics to their preferences.

a. Cost: DS piston sets can be quite expensive compared to stock or aftermarket alternatives, which may deter some buyers.

b. Installation Complexity: Installing new pistons and rings requires a significant amount of skill, time, and resources. It may be necessary to hire a professional mechanic for the job.

c. Potential Risks: Using a higher compression piston set than the engine is designed for can lead to detonation, piston damage, or other issues. It's essential to ensure the engine is properly prepared and tuned before installation.

The decision to purchase a 139661 DS piston set for a Harley-Davidson with a 3-7/6 inches bore and 8.5:1 compression ultimately depends on an individual's priorities and resources. If you value better engine performance, durability, and are willing to invest in the installation process, then this piston set could be an excellent choice. However, if cost is a significant concern, or if you're not confident in your mechanical abilities, it may be wiser to consider alternative options.

Before making a purchase, carefully assess your motorcycle's specifications, performance goals, and budget. Consult with a professional mechanic or Harley-Davidson dealer to determine if a 139661 DS piston set is the best choice for your particular situation. Additionally, consider researching alternative aftermarket piston sets or even stock pistons to ensure you're making an informed decision.

Details:

Harley Davidson FL Duo Glide 1958-1964. DS Piston Set 3-7/16 Bore 8.5:1 Compression Ratio Harley Davidson #139661: Pistons come complete with wrist pins and cir clips sold in pairs. Harley Davidson FL 80 Electra Glide 1980. Piston rings are not included.

Harley Davidson FL 1948.

part #: 139661 prices

• $39.99-$64.99

specifications pistondon:

• for models: Ds
• for makes: Harley, Davidson
• brand: Drag Specialties
• mpn: 139661
• part type: Piston Compression
• warranty details: See Manufacturer

offer pistondon:

• availability: In Stock
• quantity: 6
• options: Ship-to-home
• sold: 0
• started: May 25, 2026

general pistondon:

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

returns pistondon:

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

payments pistondon:

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

shipping pistondon:

• carrier: UPS
• cost: $0.00
• transit: 3-5 Days
• class: Standard
• service: UPS Ground
• type: Fixed

seller pistondon:

• city: Grand Rapids, Michigan
• rating: 99.8%
• # reviews: 718488

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