DRAG SPECIALTIES 139664 Piston Set Compression 3-7/16 .030 8.5

( Brand: Drag Specialties ), ( Manufacturer Part Number: 139664 ), ( Part Type: Piston Compression ), ( Warranty Details: See Manufacturer )

Review DRAG SPECIALTIES Piston Set 3-7/16 Inch .030 Bore 8.5 Compression Ratio Harley Davidson fits DS

Introducing the 139664 DS Piston Set by Harley-Davidson, a premium upgrade for your Harley-Davidson engine. This piston set is designed for engines with a stroke length of 3-7/16 inches and a compression ratio of 8.5:1, making it an excellent choice for those seeking improved performance and power.

Each piston in this set is meticulously crafted from a forged alloy steel material, ensuring superior strength and durability. The piston skirts are designed with a full-dish shape, which provides increased piston-to-cylinder contact area for better compression and increased power output. The pistons also feature a balanced design, minimizing vibrations and ensuring smooth engine operation.

The piston tops are equipped with a flat-top design, which allows for the use of modern Harley-Davidson heads and combustion systems. This design also simplifies the installation process, making it easier for DIY enthusiasts to upgrade their engines.

This piston set is manufactured to the highest standards of quality, ensuring a perfect fit and reliable performance. Each piston comes with a matching connecting rod, making the installation process seamless and efficient. The pistons are also supplied with new piston rings, which are essential for maintaining proper sealing and preventing engine oil leaks.

By upgrading to the 139664 DS Piston Set, you'll not only improve the performance and power output of your Harley-Davidson engine, but you'll also enhance its durability, ensuring that it continues to run strong for years to come. Whether you're a seasoned mechanic or a DIY enthusiast, this piston set is an excellent investment for any Harley-Davidson engine.

Pros and Cons of Buying a 139664 DS Piston Set for Harley-Davidson Motorcycles

The 139664 DS Piston Set is a popular aftermarket option for Harley-Davidson motorcycles seeking performance upgrades or piston replacement. This piston set, with a 3-7/16" bore and 8.5:1 compression ratio, is designed for various Harley-Davidson engines. In this analysis, we will discuss the benefits and drawbacks of investing in this piston set to help you make an informed decision.

1. Performance Enhancement: The 139664 DS Piston Set is designed to provide improved engine performance, including increased horsepower and torque. This can result in a more responsive and exhilarating riding experience.

2. Enhanced Durability: These aftermarket pistons are often made from high-quality materials, such as forged aluminum or steel, ensuring greater durability and longevity compared to OEM (original equipment manufacturer) pistons.

3. Compatibility: The 139664 DS Piston Set is compatible with a wide range of Harley-Davidson engines, making it a versatile option for various motorcycle models.

4. Customizability: Aftermarket piston sets like this one offer an opportunity for customization. Riders can choose different compression ratios, materials, and other features to tailor their engine's performance to their preferences.

1. Cost: Aftermarket piston sets, including the 139664 DS Piston Set, can be more expensive than OEM parts. This may deter some riders who are budget-conscious.

2. Installation Complexity: Installing aftermarket pistons requires significant mechanical expertise and tools, potentially leading to higher labor costs. Additionally, incorrect installation can result in engine damage.

3. Potential Warranty Voids: Installing aftermarket parts, such as this piston set, may void your Harley-Davidson warranty, depending on the specific terms of your agreement.

4. Unintended Consequences: Performance upgrades, like the 139664 DS Piston Set, can sometimes lead to unintended consequences, such as increased engine heat, vibrations, or noise.

The decision to buy a 139664 DS Piston Set for your Harley-Davidson motorcycle depends on your priorities, budget, and mechanical expertise. If you're looking for improved engine performance, durability, and customization options, this piston set could be an excellent investment. However, if you're concerned about the cost, installation complexity, potential warranty issues, or unintended consequences, you may want to reconsider. Ultimately, consider your budget, riding style, and long-term goals before making a decision.

If you decide to pursue this piston set, ensure that you purchase it from a reputable supplier and follow proper installation procedures. Additionally, consider investing in a high-quality piston ring set and other supporting components to ensure the longevity and reliability of your engine upgrade.

Details:

Harley Davidson FL 1948. In.Engine Type Shovel head/ Aluminum Quantity Pair Size Over Standard .030 in. Piston rings are not included. Harley Davidson FL 80 Electra Glide 1980.

DS Piston Set 3-7/16 .030 Bore 8.5:1 Compression Ratio Harley Davidson: Pistons come complete with wrist pins and cir clips sold in pairs.

part #: 139664 prices

• $39.99-$64.99

specifications pistondon:

• for models: Ds
• for makes: Harley, Davidson
• brand: Drag Specialties
• mpn: 139664
• part type: Piston Compression
• warranty details: See Manufacturer

shipping pistondon:

• class: Standard
• cost: $0.00
• service: UPS Ground
• type: Fixed
• transit: 2-5 Days
• carrier: UPS

seller pistondon:

• rating: 99.6%
• city: Grand Rapids, Michigan
• # reviews: 650819

general pistondon:

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

offer pistondon:

• options: Ship-to-home
• sold: 0
• availability: In Stock
• quantity: 3
• started: November 12, 2025

returns pistondon:

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

payments pistondon:

• credit card: Mastercard
• wallet: Paypal
• other

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