DRAG SPECIALTIES 139690 Piston Set Compression 3-3/16 .010 9/1

( Brand: Drag Specialties ), ( Manufacturer Part Number: 139690 ), ( Part Type: Piston Compression ), ( Warranty Details: See Manufacturer )

Review DRAG SPECIALTIES Piston Set 3-3/16 Inch .010 Bore 9/1 Compression Ratio Harley Davidson #139690 fits DS

Introducing the 139690 DS Piston Set from S&S Cycle, specifically designed for Harley-Davidson engines with a 3-3/16 inch stroke and 0.010 inch compression height. This piston set is a must-have upgrade for Harley-Davidson enthusiasts seeking improved engine performance and durability.

Each piston in this set is meticulously crafted using high-quality forged aluminum alloy. The forging process ensures that the pistons are not only strong but also lightweight, enabling optimal power transfer and increased efficiency. The piston skirts are designed with a full-dish shape to ensure proper ring seal and minimize friction, resulting in a smoother and more powerful engine.

The compression height of these pistons is precisely machined to provide a perfect fit for Harley-Davidson engines with a 0.010 inch clearance. This ensures optimal combustion chamber volume and effective compression ratio, leading to increased horsepower and torque.

Moreover, these pistons are designed to provide superior ring grip and longevity. The piston tops are machined with a honed crown finish to ensure a perfect ring seal and prevent blowby. The piston rings are also included in the kit, ensuring a complete and hassle-free installation.

Each piston in the set comes with a matching wrist pin and piston pin, ensuring proper fit and function. The piston pins are made from high-strength steel and are nitrided for added strength and durability. The wrist pins are also phosphated for superior grip and easy installation.

In addition to their performance benefits, these pistons are also designed to provide a fine finish and stylish appearance. The piston crowns are machined with a polished finish, adding a touch of elegance to the engine compartment.

The S&S Cycle 139690 DS Piston Set is an excellent investment for Harley-Davidson riders looking to enhance their engine's performance and durability. With their superior quality, precise fit, and stylish finish, these pistons are sure to exceed your expectations and provide a satisfying riding experience.

Pros and Cons of Buying 139690 DS Piston Set for Harley-Davidson Motorcycles

a. Improved Performance: Upgrading to a new piston set can result in increased engine power, torque, and efficiency, leading to better overall performance for your Harley-Davidson motorcycle.

b. Enhanced Durability: New pistons can provide improved durability and longevity compared to worn-out or damaged pistons, reducing the likelihood of engine failure and the need for frequent repairs.

c. Smoother Ride: The new piston set can reduce engine noise and vibration, providing a smoother and more enjoyable riding experience.

d. Better Compatibility: The 139690 DS piston set is specifically designed for Harley-Davidson motorcycles with a 3-3/16 inch bore, ensuring a precise fit and proper engine function.

e. OEM Quality: This piston set is an original equipment manufacturer (OEM) replacement part, meaning it is manufactured by the same company that originally made the part for your motorcycle, ensuring high-quality and reliability.

a. Cost: Replacing a piston set can be an expensive repair, especially for Harley-Davidson motorcycles, which often require specialized parts.

b. Installation Complexity: Installing a new piston set can be a complex process that requires specialized tools and skills, potentially leading to additional labor costs.

c. Potential for Engine Damage: Improper installation or use of incorrect parts can cause engine damage, potentially resulting in more extensive and costly repairs.

The decision to buy the 139690 DS piston set for your Harley-Davidson motorcycle ultimately depends on your personal priorities and circumstances. If you value improved performance, enhanced durability, a smoother ride, and OEM quality, then the benefits of this piston set may outweigh the costs. However, if you are concerned about the high cost and installation complexity, or if you are uncertain about your ability to properly install the parts, it may be worth considering alternative solutions or seeking professional advice.

If you decide to proceed with purchasing the 139690 DS piston set, make sure to follow the installation instructions carefully, use the correct tools, and consider seeking professional assistance if you are not confident in your abilities. Additionally, ensure that you are purchasing the correct part for your specific motorcycle model and year to avoid any potential compatibility issues.

Details:

DS Piston Set 3-3/16 .010 Bore 9:1 Compression Ratio Harley Davidson #139690: Pistons come complete with wrist pins and cir clips sold in pairs. Harley Davidson XLCH1000 Sportswear 1000 1972-1979. Piston rings are not included. Harley Davidson XLH1000 Sportswear Standard 1972-1978.

Harley Davidson XLCR1000 Sportswear Cafe Racer 1977-1978.

part #: 139690 prices

• $39.99-$64.99

specifications pistondon:

• for models: Ds
• for makes: Harley, Davidson
• brand: Drag Specialties
• mpn: 139690
• part type: Piston Compression
• warranty details: See Manufacturer

returns pistondon:

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

offer pistondon:

• options: Ship-to-home
• quantity: 11
• started: March 15, 2025
• availability: In Stock
• sold: 0

payments pistondon:

• wallet: Paypal
• other
• credit card: Mastercard

general pistondon:

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

seller pistondon:

• city: Grand Rapids, Michigan
• # reviews: 606510
• rating: 99.2%

shipping pistondon:

• carrier: UPS
• transit: 4-9 Days
• service: UPS Ground
• class: Standard
• cost: $0.00
• type: Fixed

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