Kb Pistons Hypereutectic Cast Piston 8.6:1 .010 Over - 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 Harley Evolution 80ci engine with a Kb Pistons Hypereutectic Cast Piston. This .010 inch oversize piston features an 8.6:1 compression ratio, ideal for a refresh or mild performance build. Its advanced 16% silicon content provides high thermal barrier properties and low expansion, perfectly suited for air-cooled applications.
Why riders pick this
- Hypereutectic 16% silicon alloy for thermal stability
- Low thermal expansion for tight clearances
- Designed for stock to mild 8.6:1 compression ratios
- .010 inch oversize for rebuilding
- Optimized for air-cooled Harley Evolution 80ci engines
When rebuilding or upgrading your Evolution 80ci engine, selecting the right piston is crucial for performance and longevity. Kb Pistons Hypereutectic Cast Pistons deliver a tight ring seal and reduced wear, allowing your engine to run efficiently on pump fuel. The hypereutectic alloy is a smart choice for street-driven V-twins, offering a balance of strength and thermal stability.
Engineered for Evolution Performance
- Hypereutectic alloy with 16% silicon content for superior thermal management
- Low thermal expansion rate allows for tighter piston-to-cylinder clearances
- Optimized for stock or mild compression ratios up to 10.5:1
- Designed specifically for air-cooled Harley-Davidson Evolution engines
- Promotes excellent ring seal and reduced blow-by
Reliable Power for Your EVO
These pistons are an excellent choice for riders looking to restore or mildly enhance their Evolution 80ci engine. The precise engineering ensures reliable performance, making them suitable for stock replacements or builds aiming for a bit more punch without requiring race fuel. Ensure proper machining and break-in for optimal results with your Touring, Softail, or Dyna.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB258.010
- UPC: 800745060365
- Compression Ratio: 8.6:1
- Engine Displacement: 80 cubic inches
- Piston Oversize: .010 inch
- Length: 9.5 in
- Width: 4.8 in
- Height: 4.6 in
- Weight: 2.65 lbs
- Country of Origin: Mexico
Common questions
What compression ratio are these pistons designed for?
These hypereutectic pistons are best suited for stock or mild compression ratios up to 10.5:1, specifically at 8.6:1, and are optimized for running on pump fuel.
Why choose hypereutectic pistons over forged pistons?
Hypereutectic pistons, with their high silicon content, offer excellent thermal stability and lower expansion rates, allowing for tighter clearances and quieter operation, making them ideal for street-focused air-cooled V-twin engines running pump fuel.
Will these pistons fit my specific Harley Evolution model?
These pistons are designed for Harley Evolution 80 cubic inch air-cooled engines found in various Touring, Softail, and Dyna models. Always confirm fitment for your exact year and model before purchase.
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 | 824-01002 |
| WEIGHT | 2.65 lb |
| 8.6 | 1 Compression |
