Kb Pistons Hypereutectic Cast Piston 9.6:1 .020 - Harley Evolution 80ci
About Kb Pistons
KB Performance Pistons builds hypereutectic and forged pistons for American V-twin engines, and is a long-standing choice for big-bore and stock-replacement rebuilds where budget and durability both matter.
Give your Evolution 80ci engine a new lease on life with KB Pistons Hypereutectic Cast Pistons. Engineered for riders who demand a durable and efficient engine refresh, these pistons are designed to perform reliably in your air-cooled V-twin.
Why riders pick this
- 16% silicon hypereutectic alloy
- Low thermal expansion for tight clearances
- Optimized ring seal and reduced engine noise
- Ideal for stock to mild compression builds
- Designed for air-cooled Harley Evolution 80ci
These hypereutectic cast pistons incorporate a 16% silicon content alloy, specifically chosen for its superior thermal properties and minimal expansion. This advanced material allows for tighter piston-to-cylinder wall clearances, leading to an optimal ring seal, reduced blowby, and a significantly quieter running engine, which is essential for air-cooled Harley-Davidson applications.
Built for Reliable Performance
- 16% silicon hypereutectic alloy for excellent thermal stability
- Maintains tight piston-to-cylinder clearances
- Ensures optimal ring seal and reduced engine wear
- Designed for quieter operation in air-cooled EVO engines
- Suitable for stock and mild compression ratios up to 10.5:1
A Solid Choice for Your EVO Rebuild
With a 9.6:1 compression ratio, these pistons are perfect for refreshing an Evolution 80ci engine or building a mild custom. The .020 oversized bore is designed for cylinders that have undergone machining, providing a clean and precise fit. These pistons offer a robust foundation for a long-lasting engine that delivers consistent power on pump fuel.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB305.020
- UPC: 800745130082
- Displacement: EVO 80ci
- Compression Ratio: 9.6:1
- Oversized: .020 in
- Weight: 2.8 lbs
- Country of Origin: Mexico
Common questions
Will this piston work with my high-compression EVO build?
No, KB Hypereutectic pistons are rated for compression ratios up to 10.5:1. High-compression builds over 10.5:1 typically require forged pistons.
What compression ratio does this piston provide?
This piston is designed for a 9.6:1 compression ratio, suitable for stock or mild builds up to 10.5:1 on pump fuel.
Is the .020 oversized bore a direct bolt-on?
No, the .020 oversized bore means your cylinders will need to be machined to this specific dimension for proper piston fitment. This is typically done during an engine rebuild.
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 | Kb Pistons |
| TYPE | Piston kits & Components |
| SKU | 824-01009 |
| WEIGHT | 2.8 lb |
| 9.6 | 1 Compression |
