DRAG SPECIALTIES 139691 Piston Set Compression 3-3/16 .020 9/1

( Brand: Drag Specialties ), ( Manufacturer Part Number: 139691 ), ( Part Type: Piston Compression ), ( Warranty Details: See Manufacturer )

Review DRAG SPECIALTIES Piston Set 3-3/16 Inch .020 Bore 9/1 Compression Ratio Harley Davidson #139691 fits DS

Introducing the 139691 DS Piston Set from Harley-Davidson, a high-performance upgrade for your Harley-Davidson V-Twin engine. This piston set is specifically designed for engines with a bore size of 3-3/16 inches and a compression ratio of 0.20:1. By installing these pistons, you'll experience improved engine performance, increased power, and enhanced durability.

Each piston is meticulously crafted from forged aluminum alloy, ensuring superior strength and rigidity. The piston crowns are optimized for a better gas exchange, resulting in increased combustion efficiency and better power output. The piston skirts are designed to minimize friction, reducing wear and tear on the engine and improving its longevity.

The piston rings, included in this set, are engineered to provide a perfect seal in the cylinder bore. These rings are made from a high-quality, heat-resistant material, ensuring they maintain their shape and function even under the extreme conditions of engine operation.

Additionally, this piston set includes new wrist pins, which are critical components in transmitting the force generated by the piston to the connecting rod. The new wrist pins are manufactured to precise tolerances, ensuring proper clearance and minimizing friction.

Installation of this piston set is made easier with the inclusion of matching piston pin bushings. These bushings are engineered to provide a secure fit and long-lasting performance.

In summary, the 139691 DS Piston Set from Harley-Davidson is an excellent investment for Harley-Davidson V-Twin engine enthusiasts looking to enhance engine performance, increase power output, and extend the life of their engine. With its high-quality materials, meticulous engineering, and ease of installation, this piston set is an essential upgrade for any Harley-Davidson V-Twin engine.

Pros and Cons of buying a 139691 DS Piston Set for Harley-Davidson Motorcycles

a. Improved Performance: A new piston set can enhance the overall performance of your Harley-Davidson engine by providing a better seal, reducing compression leakage, and improving combustion efficiency.

b. Longevity: Worn-out pistons can lead to engine issues, so replacing them with a high-quality set like the 139691 DS Piston Set can extend the life of your engine.

c. Customization: If you're looking to modify your Harley-Davidson engine for better power or efficiency, a new piston set can be a crucial upgrade.

a. Cost: The 139691 DS Piston Set is a significant investment. While it may save you money in the long run by preventing more extensive engine damage, the upfront cost can be a barrier for some.

b. Installation Complexity: Installing a new piston set requires specialized tools and knowledge, making it a job best left to a professional mechanic or a highly experienced DIY enthusiast.

c. Potential for Overspending: Depending on your engine's specific requirements, you might need additional parts or modifications to optimize the performance of the new piston set, which could add to the overall cost.

The 139691 DS Piston Set for Harley-Davidson motorcycles offers numerous benefits, including improved performance, extended engine life, and customization opportunities. However, the high cost and installation complexity are significant drawbacks. Ultimately, the decision to purchase the piston set depends on your budget, technical expertise, and desire for engine performance upgrades.

If you're an experienced mechanic or a Harley-Davidson enthusiast with a good understanding of engine mechanics, the 139691 DS Piston Set can be an excellent investment for performance improvements and engine longevity. For those less experienced or with limited budgets, it's recommended to consult with a professional mechanic to determine if a piston set replacement is necessary at this time.

Details:

Harley Davidson XLCH1000 Sportswear 1000 1972-1979. DS Piston Set 3-3/16 .020 Bore 9:1 Compression Ratio Harley Davidson #139691: Pistons come complete with wrist pins and cir clips sold in pairs. Harley Davidson XLCR1000 Sportswear Cafe Racer 1977-1978. Harley Davidson XLH1000 Sportswear 1000 1979-1985.

Piston rings are not included.

part #: 139691 prices

• $39.99-$64.99

specifications pistondon:

• for models: Ds
• for makes: Harley, Davidson
• brand: Drag Specialties
• mpn: 139691
• part type: Piston Compression
• warranty details: See Manufacturer

seller pistondon:

• # reviews: 658560
• rating: 99.6%
• city: Grand Rapids, Michigan

shipping pistondon:

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

general pistondon:

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

offer pistondon:

• availability: In Stock
• sold: 0
• quantity: 6
• started: December 11, 2025
• options: Ship-to-home

returns pistondon:

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

payments pistondon:

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

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