V-TWIN MANUFACTURING 11-1337 Spostster Cylinder Piston Kit 1270 Conversion

( Brand: V-twin Manufacturing ), ( Manufacturer Part Number: 11-1337 ), ( Part Type: Cylinder Piston ), ( Engine Type: 4-stroke ), ( Cylinder Bore Diameter: 3.6005 ), ( Vintage Part: No ), ( Performance Part: Yes )

Review V TWIN MANUFACTURING Harley Davidson Spostster Cylinder And Piston Conversion Kit Black fits 1986–2003

Introducing the V-Twin 11-1337 1986-2003 Harley-Davidson Sportster 1270 Cylinder Piston Conversion Kit. This high-performance upgrade is specifically designed for the Harley-Davidson Sportster XL models from 1986 to 2003.

The heart of this conversion kit lies in the 1270cc pistons. These forged pistons are engineered to deliver increased power and torque, enhancing the overall riding experience. The pistons are precision-machined to ensure a perfect fit, and their design provides superior heat dissipation for optimal engine performance.

The piston kit also includes high-performance rings that offer improved sealing and longer ring life. These rings are made from a high-temperature, low-friction material, ensuring a smoother engine operation with reduced wear and tear.

Another significant upgrade in this conversion kit is the cylinder kit. The cylinders are CNC machined from premium aluminum alloy, ensuring excellent heat dissipation and durability. The cylinder bore is honed to ensure a perfect fit with the pistons, ensuring a proper ring seal and a significant reduction in engine blow-by.

The piston kit comes with matching connecting rods that are designed to work seamlessly with the new pistons and cylinders. The rods are made from high-strength steel and are precision-balanced to ensure optimal engine balance and vibration reduction.

This conversion kit also includes new gudgeon pins and piston pin bushings, ensuring a proper fit and reducing engine noise. Additionally, the kit comes with new piston pin retainers, which are made from high-strength steel and provide improved clamping force to keep the piston pins in place.

The V-Twin 11-1337 1986-2003 Harley-Davidson Sportster 1270 Cylinder Piston Conversion Kit is an ideal choice for riders who want to take their Harley-Davidson Sportster to the next level. With increased power, torque, and durability, this conversion kit is sure to provide a thrilling riding experience.

Please note that this conversion kit requires some engine disassembly, and professional installation is recommended. It is important to follow the installation instructions carefully to ensure proper installation and optimal engine performance.

The Harley-Davidson Sportster 1200cc engine has been a popular choice among riders for its reliability and power. However, some enthusiasts prefer the unique character and increased power that comes with a V-twin 114ci (1868cc) piston conversion kit like the 1986-03 Harley Davidson Sportster 1270 cylinder piston conversion kit. In this analysis, we will discuss the pros and cons of installing such a kit on your Harley-Davidson Sportster.

1. Increased Power: The primary reason for installing a larger piston kit is to enhance the engine's power output. A larger piston allows the engine to compress more fuel-air mixture, leading to better combustion and increased power.

2. Unique Sound: The larger piston kit can provide a more distinctive V-twin exhaust note, which is often preferred by Harley-Davidson enthusiasts.

3. Customization: Installing a larger piston kit can be an excellent way to personalize your motorcycle and set it apart from other standard Sportsters.

1. Cost: Installing a larger piston kit can be costly, as it involves purchasing new pistons, rings, cylinders, and other related components.

2. Complexity: The installation process can be complex and time-consuming, requiring a high level of mechanical expertise and specialized tools.

3. Potential Powerband Shift: Installing a larger piston kit can result in a powerband shift, which may require adjustments to the carburetion or fuel injection system to maintain optimal engine performance.

Installing a V-twin 114ci (1868cc) piston conversion kit on your Harley-Davidson Sportster can provide increased power, a unique exhaust note, and a customized look. However, it comes with a significant cost, complexity, and potential powerband shift. Therefore, it is essential to weigh these factors against the benefits before making a decision.

If you are an experienced motorcycle mechanic with a strong desire for increased power and a unique sound, then installing a larger piston kit on your Harley-Davidson Sportster may be worth considering. However, if you are a beginner or are looking for a more straightforward and cost-effective solution, other options like performance chips or exhaust systems may be more suitable. Ultimately, the decision depends on your riding style, mechanical expertise, and budget.

Details:

MC forged pistons have a Teflon coated top to aid in more complete combustion. No machining necessary. Big bore cylinder kit for 1200-1270cc conversion on Spostster model's. NOTE: Kit can be used for conversion of 1200cc model's to 1270cc only.

Cylinders are pre-fitted with a forged piston set Molly rings, ready to install. Our kit includes 2 black highlighter finished cylinders, pistons and rings. Increase your horsepower with our V-Twin 1270cc big bore conversion kit.

part #: 111337 prices

• $562.24-$1011.93

specifications pistondon:

• for makes: Harley, Davidson
• for years: 1986-2003
• brand: V-twin Manufacturing
• mpn: 11-1337
• part type: Cylinder Piston
• engine type: 4-stroke
• cylinder bore diameter: 3.6005
• vintage part: No
• performance part: Yes

returns pistondon:

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

offer pistondon:

• options: Ship-to-home
• sold: 0
• quantity: 1
• availability: In Stock
• started: February 19, 2026

payments pistondon:

• credit card: Diners-club
• wallet: Paypal
• other

seller pistondon:

• rating: 100.0%
• city: Colorado Springs, Colorado
• # reviews: 428

shipping pistondon:

• class: Standard
• transit: 5-11 Days
• type: Fixed
• service: UPS Ground
• cost: $0.00
• carrier: UPS

general pistondon:

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

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