Wiseco 1340 EVO Big Twin 10:1 Compression Piston Kit - Harley Evolution
About Wiseco
Wiseco has forged pistons in Mentor, Ohio since 1941, supplying everything from factory race teams to big-bore street builds. Forged construction is what lets a V-twin survive higher compression and more cylinder pressure than the stock cast piston was designed for.
Upgrade your 1340cc Harley EVO Big Twin with this Wiseco Piston Kit, delivering a robust 10:1 compression ratio for enhanced power and responsiveness. These pistons are forged from high-silicon, low-expansion aluminum, engineered for superior strength and extended engine life. This kit is a vital upgrade for any performance-minded EVO owner.
Why riders pick this
- Boosts compression to 10:1 for more power
- Forged high-silicon aluminum for superior strength
- CNC diamond-turned for ultimate precision
- Works with all common cylinder bore types
- Designed for extended engine life
Building a powerful and reliable 1340 EVO Big Twin starts with quality internals. Wiseco forged pistons are a proven choice, offering significant advantages in durability and heat management over standard cast components. This kit is designed to provide a strong foundation for your engine, whether you're rebuilding or pushing for more performance.
Engineered for Maximum Durability
- Forged high-silicon, low-expansion aluminum construction for exceptional strength
- Diamond-turned finish with CNC precision ensures optimal fit and ring seal
- Compatible with all major cylinder bore types: cast iron, chrome, nikasil, and boron composite
- State-of-the-art computerized manufacturing for consistent quality and reliable performance
Optimizing Your EVO Engine
A 10:1 compression ratio is an excellent choice for unlocking more power from your 1340 EVO. To get the most out of this piston kit, pair it with complementary upgrades such as a performance camshaft, a high-flow air cleaner, and a 2-into-1 exhaust system. A professional dyno tune will then optimize your engine's fuel delivery and ignition timing, ensuring peak performance and reliability.
Specifications
- Brand: Wiseco
- Manufacturer Part #: K1667
- Compression Ratio: 10:1
- Engine Type: 1340cc EVO Big Twin
- Length: 9.6 in
- Width: 5 in
- Height: 4 in
- Weight: 2.6 lbs
Common questions
Will installing these pistons change the engine's sound?
While the pistons themselves won't directly change exhaust sound, increasing compression can slightly alter the engine's combustion characteristics, which might subtly affect the overall engine note.
Do these pistons come with rings and wrist pins?
Wiseco piston kits typically include all necessary components for installation, such as piston rings, wrist pins, and circlips. Please confirm specific kit contents with the product details.
What is the importance of a dyno tune after installation?
A dyno tune is crucial after installing performance pistons and increasing compression. It ensures your engine's air/fuel ratio and ignition timing are optimized for the new compression, preventing damage and maximizing power.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Wiseco |
| TYPE | Piston kits & Components |
| SKU | K1667 |
| WEIGHT | 2.6 lb |
| 10 | 1 Compression |
