DRAG SPECIALTIES 139668 Piston Set Compression 3-7/16 .070 8.5

( Brand: Drag Specialties ), ( Manufacturer Part Number: 139668 ), ( Part Type: Piston Compression ), ( Warranty Details: See Manufacturer )

Review DRAG SPECIALTIES Piston Set 3-7/16 Inch .070 Bore 8.5 Compression Ratio Harley Davidson fits DS

Introducing the 139668 DS Piston Set by Harley-Davidson, specifically designed for Harley-Davidson engines with a piston bore size of 3-7/16 inches and a compression ratio of 8.5:1. This piston set is an essential upgrade for any Harley-Davidson enthusiast looking to enhance the performance of their engine.

Each piston is meticulously engineered using high-quality forged aluminum alloy. The piston crown is designed with a unique dish shape that optimizes combustion efficiency, resulting in improved power output and smooth engine operation. The skirt of the piston is machined to precise tolerances to ensure a perfect fit within the cylinder bore, minimizing friction and wear for extended engine life.

The piston rings included in this set are also of the highest quality. The top ring is a compression ring designed to seal the combustion gases in the cylinder, while the second ring is an oil control ring that helps prevent oil from entering the crankcase during combustion. The piston rings are made from a nitrided steel alloy that ensures a long-lasting and effective seal.

Additionally, the piston set comes with new wrist pins and piston pin bushings, ensuring a perfect fit and minimal wear. The wrist pins are made of high-strength steel, while the bushings are made from bronze material for optimal durability and lubricity.

This piston set is compatible with select Harley-Davidson engines, including those found in Touring, Softail, and Sportster models. It is important to verify that this piston set is suitable for your specific engine model before installation.

In conclusion, the 139668 DS Piston Set by Harley-Davidson is an excellent choice for Harley-Davidson enthusiasts seeking to upgrade their engine's performance. With its high-quality materials, precise machining, and advanced design features, this piston set is sure to provide improved power output, smooth engine operation, and extended engine life.

Pros and Cons of buying a 139668 DS Piston Set 3-7/16 for Harley-Davidson Engines

The 139668 DS Piston Set 3-7/16, 070, 8.5 compression, is a popular aftermarket piston option for Harley-Davidson engines. This piston set is designed to increase compression and improve engine performance. In this article, we will discuss the pros and cons of purchasing this piston set for your Harley-Davidson engine.

1. Increased Compression: The primary benefit of this piston set is the increased compression ratio, which can lead to improved engine performance, better fuel efficiency, and increased horsepower.

2. Durability: These pistons are made from high-quality materials and are designed to withstand the rigors of Harley-Davidson engines, providing longer engine life and reduced maintenance costs.

3. Improved Power: The increased compression ratio and improved piston design can lead to improved power output, making your Harley-Davidson engine more responsive and faster.

4. Easy Installation: The piston set comes with all necessary hardware for installation, making it a relatively straightforward process for experienced motorcycle mechanics.

1. Cost: The 139668 DS Piston Set is a premium aftermarket option and can be quite expensive compared to OEM pistons or other aftermarket options.

2. Requires Engine Rebuild: Installing this piston set requires a complete engine teardown and rebuild, which can be time-consuming and expensive.

3. Risk of Engine Damage: Installing aftermarket pistons carries a risk of engine damage if not done correctly, which can result in costly repairs.

4. May Void Warranty: Installing aftermarket pistons may void your Harley-Davidson engine warranty, which can be a concern for some riders.

The 139668 DS Piston Set 3-7/16 is an excellent option for Harley-Davidson riders looking to improve engine performance, durability, and power output. However, it comes with some significant drawbacks, including the high cost, the need for a complete engine rebuild, and the risk of engine damage. Ultimately, the decision to purchase this piston set depends on your budget, mechanical expertise, and desired level of engine performance. If you are comfortable with the installation process and the cost, this piston set can provide significant benefits for your Harley-Davidson engine.

If you are considering purchasing the 139668 DS Piston Set 3-7/16 for your Harley-Davidson engine, we recommend doing thorough research on the installation process, consulting with experienced motorcycle mechanics, and weighing the pros and cons carefully before making a decision. Additionally, consider your budget, desired level of engine performance, and mechanical expertise before making a purchase. If you are unsure, it may be best to opt for OEM pistons or other aftermarket options that may be more cost-effective and require less extensive engine work.

Details:

Harley Davidson FL 1948. Harley Davidson FL 80 Electra Glide 1980. DS Piston Set 3-7/16 .070 Bore 8.5:1 Compression Ratio Harley Davidson: Pistons come complete with wrist pins and cir clips sold in pairs. Piston rings are not included.

In.Engine Type Shovel head/ Aluminum Quantity Pair Size Over Standard .070 in.

part #: 139668 prices

• $39.99-$64.99

specifications pistondon:

• for models: Ds
• for makes: Harley, Davidson
• brand: Drag Specialties
• mpn: 139668
• part type: Piston Compression
• warranty details: See Manufacturer

seller pistondon:

• # reviews: 668345
• city: Grand Rapids, Michigan
• rating: 99.7%

offer pistondon:

• sold: 0
• options: Ship-to-home
• quantity: 5
• availability: In Stock
• started: January 15, 2026

payments pistondon:

• other
• credit card: Visa
• wallet: Paypal

general pistondon:

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

shipping pistondon:

• type: Fixed
• class: Standard
• carrier: UPS
• service: UPS Ground
• cost: $0.00
• transit: 2-7 Days

returns pistondon:

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

Drag Specialties 139668 Is Similar To:

• Drag Specialties 750766-bx-lb1 Ds-750766 (37.4% similar) Drag Specialties DS-750766 piston kit 1200CC. Available in various compression ratios. Photos are for reference only. Bore - standard bore, 9:1, pistons come complete with wrist pins and keepers sold in pairs. Actual product may differ from the item shown in photograph. Rings are not...(August 17th, 2024)
• Drag Specialties 0911-0043 (30.4% similar) Rings are not included suggest using Hastings rings. Bore - .010IN. Available in various compression ratios. Compression: 9.0:1 compression, sizing: 0.010IN. Oversize, pistons come complete with wrist pins and keepers sold in pairs. Actual product may differ from the item shown in...(August 23rd, 2024)
• Drag Specialties 0911-0083 Twin Cam 020 Inch Piston Kit Harley-davidson Electra Glide Classic Flhtc 1999-20 (42.5% similar) Part #: Drag Specialties 0911-0083 for sale...(August 23rd, 2024)
• Drag Specialties 0911-0046 Pistons Bb 005 99-06 Harley-davidson Twin Cam (54.7% similar) This occasionally happens, and is rare...(August 27th, 2024)
• Drag Specialties 0911-0082 (30.4% similar) Bore - 0.010IN. Available in various compression ratios. Bore, 9.4:1 compression, bore: 3.875IN. Photos are for reference only. Actual product may differ from the item shown in photograph. Compression: 9.4:1 compression, sizing: standard bore, pistons come complete with wrist pins and...(August 30th, 2024)
• Drag Specialties 0912-0942 Replacement Piston Ring Set 3.750 Inch Standard Bore (48.9% similar) Available in standard and oversize bore sizes. Actual product may differ from the item shown in photograph. Each set includes rings for two pistons. Designed for use with Drag Specialties replacement pistons and oem. Photos are for reference only. Feature high-quality Molly top rings...(September 14th, 2024)
• Drag Specialties 0911-0048 Big Bore Piston (38.3% similar) Free shipping offer does not include oversized parts. Keep in mind that a part can be used several times over multiple year, make, model's...(September 22nd, 2024)
• Drag Specialties 0911-0081 (30.4% similar) Bore - 0.005IN. Drag Specialties 0911-0081 piston kit 3.875IN. Rings are not included suggest using Hastings rings. Available in various compression ratios. Photos are for reference only. Compression: 9.4:1 compression, sizing: standard bore, pistons come complete with wrist pins and...(September 25th, 2024)
• Drag Specialties 0911-0041 Standard Pistons For 99-06 88 Inch Twin Cam (47.3% similar) Features: piston for twin cam motors. Specs: product name piston, bore size 3.750, - oversize standard, compression ratio 9.0:1, units pair, riding style street...(October 6th, 2024)
• Drag Specialties Ds-750754 Harley Davidson Xl 040 Piston Kit High Compression (45.2% similar) Condition is new. Drag Specialties harley davidson XL .040 piston kit DS-750754 high compression. Shipped with USPS priority mail...(October 27th, 2024)
• Drag Specialties Ds-750705 (40% similar) Bore - .050IN. Compression: 8.5:1 high compression, sizing: 0.050IN. Rings are not included suggest using Hastings rings. Photos are for reference only. Actual product may differ from the item shown in photograph. Oversize, pistons come complete with wrist pins and keepers sold in...(November 23rd, 2024)