Kb Pistons Hypereutectic Cast Piston 9.6:1 .010 - 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.
Upgrade your Evolution 80ci engine with KB Pistons Hypereutectic Cast Pistons, precisely engineered for riders seeking improved thermal management and reduced engine noise. These pistons deliver a reliable foundation for your air-cooled V-twin performance build.
Why riders pick this
- Advanced 16% silicon hypereutectic alloy
- Low thermal expansion for tight clearances
- Reduces engine noise and wear
- Optimal ring seal for efficiency
- 9.6:1 compression for pump fuel applications
Crafted from a 16% silicon hypereutectic alloy, these pistons boast superior thermal stability and minimal expansion. This advanced material allows for tighter piston-to-cylinder wall clearances, which translates directly to a better ring seal, less blowby, and a quieter running engine – crucial for air-cooled Harley-Davidson applications.
Optimized for Air-Cooled Performance
- 16% silicon hypereutectic alloy resists thermal expansion
- Enables tighter piston-to-cylinder clearances
- Reduces blowby and mechanical engine noise
- Promotes optimal ring seal for consistent power
- Designed for durability in air-cooled EVO 80ci engines
The Foundation of a Solid Build
With a 9.6:1 compression ratio, these pistons are perfectly suited for stock or mild Evolution 80ci engine builds running on pump fuel. The .010 oversized dimension is ideal for cylinders that have been bored out, ensuring a fresh, precise fit. Invest in these pistons for a dependable, long-lasting engine refresh that enhances both performance and longevity.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB305.010
- UPC: 800745130075
- Engine: EVO 80ci
- Compression Ratio: 9.6:1
- Oversized: .010 in
- Length: 9.6 in
- Width: 4.8 in
- Height: 4.6 in
- Weight: 2.8 lbs
- Country of Origin: Mexico
Common questions
What compression ratio is this piston designed for?
This piston is designed for a 9.6:1 compression ratio, ideal for stock to mild builds up to 10.5:1 on pump fuel.
Why is the .010 overbore significant?
The .010 overbore size means these pistons are designed for cylinders that have been bored out slightly to clean up wear or damage, providing a fresh, tight fit.
Are these pistons suitable for high-performance builds?
These hypereutectic pistons are best suited for stock to mild compression ratio builds up to 10.5:1. For higher compression or forced induction applications, forged pistons are typically recommended.
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 | 824-01008 |
| WEIGHT | 2.8 lb |
| 9.6 | 1 Compression |
