Kb Pistons Hypereutectic Cast Piston 10.5:1 .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.
Maximize the output of your Evolution 80ci engine with KB Pistons Hypereutectic Cast Pistons. Designed for riders seeking a noticeable increase in compression and power, these pistons provide a robust foundation for your V-twin's performance aspirations.
Why riders pick this
- 16% silicon hypereutectic alloy
- Low thermal expansion for tight clearances
- Optimized for 10.5:1 compression ratio
- Reduces engine wear and noise
- Designed for air-cooled Harley Evolution 80ci
These pistons are meticulously cast from a 16% silicon hypereutectic alloy, a material renowned for its low thermal expansion and exceptional stability. This allows for tighter piston-to-cylinder wall clearances, which is paramount for air-cooled engines, ensuring an optimal ring seal, reduced blowby, and a quieter, more efficient engine operation with less wear.
Engineered for Performance and Longevity
- 16% silicon hypereutectic alloy for minimal thermal expansion
- Enables tight piston-to-cylinder wall clearances
- Promotes optimal ring seal and reduced engine wear
- Designed for 10.5:1 compression ratio
- Suitable for air-cooled Harley Evolution 80ci engines
Unlock More Power
With a 10.5:1 compression ratio, these pistons are an excellent choice for Evolution 80ci builds aiming for increased power while remaining compatible with standard pump fuel. The .010 oversized bore is ideal for cylinders that have been reconditioned, ensuring a precise and durable fit. Combine these pistons with other performance upgrades like a cam swap for a truly transformative riding experience.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB266.010
- UPC: 800745061409
- Compression Ratio: 10.5:1
- Bore Size: .010 oversized
- Engine: EVO 80ci
- Weight: 2.7 lbs
- Country of Origin: Mexico
Common questions
What compression ratio are these pistons rated for?
These KB Pistons are rated for a 10.5:1 compression ratio, making them ideal for performance builds running on pump fuel.
Will these work in a high-compression or boosted engine?
No, hypereutectic pistons are designed for stock to mild compression ratios. For higher compression or forced induction applications, forged pistons are recommended for their increased strength.
Do I need to machine my cylinders for these pistons?
Yes, these pistons are .010 oversized, meaning your cylinders will need to be bored and honed to this specific dimension for proper fitment 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 | 824-01014 |
| WEIGHT | 2.7 lb |
| 10.5 | 1 Compression |
