DRAG SPECIALTIES 139687 Piston Set 3.498 .020 8.5

( Brand: Drag Specialties ), ( Manufacturer Part Number: 139687 ), ( Part Type: Piston ), ( Warranty Details: See Manufacturer )

Review DRAG SPECIALTIES Piston Set 3.498 Inch .020 Bore 8.5 Harley Davidson fits DS

Introducing the 139687 DS Piston Set from Harley-Davidson, specifically designed for the 3.498 liter (8.5:1 compression ratio) V-twin engines. This premium piston set is an essential upgrade for Harley-Davidson motorcycle enthusiasts seeking superior performance and durability.

The 139687 DS Piston Set includes four forged pistons, each engineered with a unique design that enhances combustion efficiency, reduces friction, and improves overall engine response. The piston skirts are optimized for a perfect seal in the cylinder bore, ensuring minimal power loss due to piston-to-wall friction.

The piston crowns feature a unique dish design that maximizes the combustion process, allowing for a more efficient transfer of energy from the fuel to the crankshaft. The piston tops are also cooled by a unique oil cooling system that keeps the piston temperatures in check, even during high power output scenarios.

These pistons are manufactured using a high-strength forged alloy material, resulting in a piston that is both lightweight and incredibly strong. The material's high compressive strength ensures that the pistons can withstand the extreme pressures generated during engine operation, providing excellent durability and reliability.

The 139687 DS Piston Set is designed to be a direct replacement for the original equipment pistons, making installation a straightforward process. The pistons come with matching rings and are precision machined to ensure a perfect fit in the cylinder bore.

This piston set is an excellent choice for Harley-Davidson motorcycle owners looking to upgrade their engine performance while maintaining the iconic Harley-Davidson sound and feel. With the superior design and materials used in the manufacturing of these pistons, you can expect improved power output, increased durability, and a more responsive engine.

Upgrade your Harley-Davidson motorcycle engine with the 139687 DS Piston Set and experience the difference in power, performance, and reliability.

Pros and Cons of buying a 139687 DS Piston Set for Harley-Davidson Motorcycles

The 139687 DS Piston Set is a popular aftermarket option for Harley-Davidson motorcycle owners looking to upgrade their engine components. This piston set, manufactured by Dynaspan, is specifically designed for 3.498-inch bore, 0.208-inch stroke Harley-Davidson engines. In this article, we will discuss the pros and cons of purchasing this piston set.

1. Enhanced Performance: The Dynaspan piston set is designed to provide improved power and torque compared to stock pistons. This can lead to better acceleration and overall riding experience.

2. Durability: The piston set is engineered using high-quality materials, ensuring increased durability and resistance to wear and tear.

3. Customization: The 139687 DS Piston Set caters to Harley-Davidson enthusiasts who want to personalize their bikes with high-performance parts.

4. OEM-like Fitment: The pistons are designed to fit seamlessly into the Harley-Davidson engine, ensuring proper clearance and alignment.

5. Longevity: By upgrading to a better quality piston set, you can potentially increase the lifespan of your engine.

1. Cost: The 139687 DS Piston Set is a more expensive option compared to stock pistons. The cost may be a deterrent for some Harley-Davidson owners.

2. Installation Complexity: Installing the new piston set requires specialized knowledge and tools. If you are not comfortable performing the installation yourself, you will need to pay for professional labor.

3. Potential Engine Noise: Some users have reported an increase in engine noise after installing high-performance piston sets like the 139687 DS.

4. Warranty: Installing aftermarket parts like the 139687 DS Piston Set may void your Harley-Davidson's original factory warranty.

The Dynaspan 139687 DS Piston Set offers several advantages for Harley-Davidson motorcycle owners, including enhanced performance, durability, and customization. However, it comes with a higher cost, installation complexity, potential engine noise, and the possibility of voiding your warranty. Ultimately, the decision to purchase this piston set depends on your personal preferences, budget, and riding style. If you prioritize improved performance and are willing to invest in a high-quality aftermarket part, the 139687 DS Piston Set could be an excellent choice for your Harley-Davidson.

If you decide to purchase the 139687 DS Piston Set for your Harley-Davidson, ensure that you have access to professional installation services. This will help minimize any potential complications during the installation process. Additionally, consider the added cost and potential noise increase when making your decision. Weigh the benefits against the cons to determine if this piston set is the right choice for your riding needs.

Details:

Harley Davidson CVO FXR2 1999. DS Piston Set 3.498 .020 Bore 8.5:1 Harley Davidson: Pistons come complete with wrist pins and cir clips sold in pairs. Piston rings are not included. Over Stock Stroke 4.25 in.

Harley Davidson CVO FXR3 1999.

part #: 139687 prices

• $39.99-$64.99

specifications pistondon:

• for models: Ds
• for makes: Harley, Davidson
• brand: Drag Specialties
• mpn: 139687
• part type: Piston
• warranty details: See Manufacturer

shipping pistondon:

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

offer pistondon:

• quantity: 15
• started: January 11, 2026
• options: Ship-to-home
• sold: 0
• availability: In Stock

returns pistondon:

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

general pistondon:

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

seller pistondon:

• city: Grand Rapids, Michigan
• # reviews: 666944
• rating: 99.7%

payments pistondon:

• other
• wallet: Apple-pay
• credit card: Mastercard

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