DRAG SPECIALTIES 139667 Piston Set Compression 3-7/16 .060 8.5

( Brand: Drag Specialties ), ( Manufacturer Part Number: 139667 ), ( Part Type: Piston Compression ), ( Warranty Details: See Manufacturer )

Review DRAG SPECIALTIES Piston Set 3-7/16 Inch .060 Bore 8.5 Compression Ratio Harley Davidson fits DS

Harley-Davidson 139667 DS Piston Set for Big Twin Engines (3-7/16 inches, 060, 8.5:1 Compression Ratio)

The Harley-Davidson 139667 DS Piston Set is meticulously engineered for Harley-Davidson Big Twin engines, ensuring optimal performance and reliability. This set is specifically designed for engines with a piston bore size of 3-7/16 inches and features a compression ratio of 8.5:1.

Each piston in this set is made from high-quality forged aluminum alloy, delivering the necessary strength and durability to withstand the rigors of high-performance riding. The compression rings are precision-machined to provide a perfect seal and maximum compression, while the skirt design offers improved oil control and reduced friction.

The Harley-Davidson 139667 DS Piston Set also features a unique, dual-deck design. This innovative approach provides an additional layer of support to the piston crown, enhancing its durability and longevity. Furthermore, it allows for a more even distribution of heat, ensuring consistent engine performance under various riding conditions.

Installation of these pistons is made simple with the included Harley-Davidson gudgeon pins and wrist pins, which are designed to provide a secure and precise fit. Additionally, the piston set comes with new rings and ring grooves, ensuring a proper fit and seal.

In summary, the Harley-Davidson 139667 DS Piston Set is a high-performance upgrade for your Big Twin engine. Its forged aluminum construction, dual-deck design, and precision-engineered components deliver enhanced durability, improved compression, and consistent performance. Start your engine upgrade journey with confidence and trust in the proven quality of Harley-Davidson parts.

Pros and Cons of buying a 139667 DS Piston Set for Harley Davidson 3-7/16, 060, 8.5 Compression

The 139667 DS Piston Set is a popular choice among Harley Davidson enthusiasts for upgrading their motorcycle's performance. This piston set is designed for 3-7/16 inch bore size, 060 piston weight, and 8.5:1 compression ratio. In this analysis, we will discuss the advantages and disadvantages of purchasing this piston set.

1. Improved Performance: The 139667 DS Piston Set is designed to provide better combustion efficiency and increased power output, resulting in improved engine performance.

2. Enhanced Durability: These pistons are made using high-quality materials, ensuring they can withstand the rigors of high-performance riding.

3. Customization: This piston set allows riders to customize their engine's compression ratio for better performance and tuning capabilities.

4. OEM Quality: The 139667 DS Piston Set is a direct OEM replacement, ensuring proper fitment and compatibility with your Harley Davidson engine.

1. Cost: The 139667 DS Piston Set can be quite expensive compared to stock pistons or aftermarket alternatives.

2. Installation Complexity: Installing these pistons requires specialized tools and expertise, which may add to the overall cost and complexity of the upgrade.

3. Potential Power Increase: While increased power is desirable for some riders, it may not be suitable for all applications. In some cases, excessive power can lead to safety concerns or potential engine damage.

The 139667 DS Piston Set is an excellent choice for Harley Davidson enthusiasts seeking improved performance and enhanced durability. However, its high cost and installation complexity may deter some riders. Ultimately, the decision to purchase this piston set depends on your individual riding goals and budget.

If you are a serious Harley Davidson enthusiast looking for increased performance and durability, the 139667 DS Piston Set is a worthwhile investment. However, consider your budget and installation capabilities before making a purchase. Alternatively, you can explore aftermarket piston sets or consult with a professional mechanic to determine the best option for your specific needs.

Details:

Harley Davidson FL 80 Electra Glide 1980. In.Engine Type Shovel head/ Aluminum Quantity Pair Size Over Standard .060 in. Piston rings are not included. DS Piston Set 3-7/16 .060 Bore 8.5:1 Compression Ratio Harley Davidson: Pistons come complete with wrist pins and cir clips sold in pairs.

Harley Davidson FL 1948.

part #: 139667 prices

• $39.99-$64.99

specifications pistondon:

• for models: Ds
• for makes: Harley, Davidson
• brand: Drag Specialties
• mpn: 139667
• part type: Piston Compression
• warranty details: See Manufacturer

general pistondon:

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

returns pistondon:

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

offer pistondon:

• started: May 13, 2026
• sold: 0
• quantity: 14
• availability: In Stock
• options: Ship-to-home

shipping pistondon:

• transit: 2-6 Days
• service: UPS Ground
• carrier: UPS
• type: Fixed
• cost: $0.00
• class: Standard

seller pistondon:

• rating: 99.8%
• # reviews: 713486
• city: Grand Rapids, Michigan

payments pistondon:

• wallet: Paypal
• credit card: Discover
• other

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