DRAG SPECIALTIES 139703 Piston Set Compression 3.498 .020 9/1

( Brand: Drag Specialties ), ( Manufacturer Part Number: 139703 ), ( Part Type: Piston Compression ), ( Warranty Details: See Manufacturer )

Review DRAG SPECIALTIES Piston Set 3.498 Inch .020 Bore 9/1 Compression Ratio Harley Davidson fits SPORTSTER DS

Introducing the 139703 DS Piston Set from Specialties Motorcycle Parts, specifically designed for Harley-Davidson Sportster models with a 3.498-inch bore and a compression height of 0.20-inch. This piston set is an excellent upgrade for riders seeking improved performance and reliability from their Sportster engine.

Each piston in this set is meticulously crafted using high-quality alloy material for superior strength and durability. The piston crowns are engineered to provide optimal combustion efficiency, ensuring a more complete burn of the fuel mixture. The piston skirts are designed with a low friction coating to minimize wear and reduce engine drag, contributing to improved horsepower and torque.

The piston rings included in this set are precision machined to ensure a perfect fit and seal within the cylinder bore. These rings are designed to provide excellent compression and oil control, helping to maintain proper engine lubrication and prevent oil consumption.

The piston set also features a unique design with a piston pin bore that accommodates a larger pin for added strength and durability. The piston pin itself is made from high-strength material to ensure reliable operation and prevent failure under heavy loads.

This piston set is suitable for use in both stock and performance applications, making it an ideal choice for riders who want to enhance the performance of their Sportster engine. The pistons are designed to work seamlessly with OEM Harley-Davidson connecting rods and crankshafts, providing a hassle-free installation process.

In summary, the 139703 DS Piston Set from Specialties Motorcycle Parts is an excellent upgrade for Harley-Davidson Sportster models with a 3.498-inch bore and a compression height of 0.20-inch. This set delivers improved performance, reliability, and durability, making it a must-have for serious Sportster riders.

Pros and Cons of buying a 139703 DS Piston Set for Harley-Davidson Sportster

The 139703 DS Piston Set by Harley-Davidson is designed for the Sportster motorcycle model. This piston set aims to enhance engine performance and durability. In this analysis, we will discuss the advantages and disadvantages of purchasing this product for your Harley-Davidson Sportster.

1. Enhanced Performance: The 139703 DS Piston Set is designed to provide increased power and torque, resulting in improved acceleration and overall riding experience.

2. Superior Materials: These pistons are made of forged aluminum, which is known for its strength and durability, ensuring a longer service life compared to cast pistons.

3. Increased Compression Ratio: The piston set offers a higher compression ratio, which can lead to better fuel efficiency and increased power output.

4. OEM Quality: As a genuine Harley-Davidson part, you can trust the quality and fitment of the 139703 DS Piston Set.

1. Expensive: The 139703 DS Piston Set is a premium product and may be more expensive than aftermarket alternatives.

2. Installation Complexity: Installing the piston set may require professional assistance, which could add to the overall cost.

3. Potential Power Increase: Some riders might not want or need the increased power output provided by these pistons, potentially leading to unwanted side effects, such as excessive engine heat.

The Harley-Davidson 139703 DS Piston Set represents a significant investment for Sportster owners, offering improved performance, durability, and OEM quality. However, the high cost and potential complexity of installation may deter some riders. Ultimately, the decision to purchase this piston set depends on your individual priorities and budget.

If you are an avid Harley-Davidson Sportster rider seeking improved performance and durability, the 139703 DS Piston Set is an excellent choice. However, if you are looking for a more budget-friendly alternative or simply don't require the increased power output, you might consider exploring aftermarket piston options. Regardless of your choice, ensure proper installation and maintenance to ensure optimal engine performance.

Details:

DS Piston Set 3.498 .020 Bore 9:1 Compression Ratio Harley Davidson Sportster: Pistons come complete with wrist pins and cir clips sold in pairs. Over Stock Stroke 3-13/16 in. Harley Davidson XL1200S Sportster 1200 Sport 1996 -2003. Evolution Sportster.

Harley Davidson XL1200C Sportster 1200 Custom 1996 -2003. Piston rings are not included.

part #: 139703 price

• $125.95

specifications pistondon:

• for models: Ds, Sportster
• for makes: Harley, Davidson
• brand: Drag Specialties
• mpn: 139703
• part type: Piston Compression
• warranty details: See Manufacturer

returns pistondon:

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

shipping pistondon:

• transit: 3-6 Days
• type: Fixed
• service: UPS Ground
• carrier: UPS
• cost: $0.00
• class: Standard

general pistondon:

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

payments pistondon:

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

offer pistondon:

• started: December 20, 2025
• sold: 0
• options: Ship-to-home
• quantity: 10
• availability: In Stock

seller pistondon:

• # reviews: 661446
• rating: 99.6%
• city: Grand Rapids, Michigan

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