Kb Pistons Forged Alloy 9.5:1 .005 Over Piston Kit - Harley EVO 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.
Inject new life into your Harley Evolution 80ci engine with Kb Pistons forged alloy pistons. These pistons feature a 9.5:1 compression ratio and a .005 oversized bore, perfect for a performance refresh.
Why riders pick this
- 9.5:1 compression ratio for enhanced power
- .005 oversized bore for cylinder refresh
- Forged 4032 alloy for superior crack resistance
- Coated skirts reduce friction and wear
- Includes all rings, wrist pins, and locks
When it's time to rebuild or upgrade your Evolution 80ci engine, starting with a quality piston kit is essential. This Kb Pistons forged alloy piston set offers a robust 9.5:1 compression ratio, providing a solid performance gain over stock. The .005 oversized bore allows for a minimal cylinder hone, ensuring a perfect fit and optimal ring seal without requiring a major bore job.
Engineered for Reliability Under Load
- Constructed from 4032 forged alloy with 11% silicon for exceptional strength
- Superior resistance to cracking and pre-ignition, even in high-stress scenarios
- Coated skirts reduce friction, promoting smoother operation and longer life
- Includes all necessary rings, wrist pins, and wrist pin locks for a complete assembly
Ideal for Performance Engine Builders
These pistons are designed to meet the demands of performance-oriented EVO builds, including those utilizing power adders like nitrous oxide or superchargers. The robust forged construction ensures they can handle the increased cylinder pressures and temperatures. For maximum performance, consider pairing these pistons with a performance camshaft, a free-flowing exhaust, and a custom dyno tune.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB920C.005
- UPC: 800745155306
- Compression Ratio: 9.5:1
- Bore Size: .005 oversized
- Engine Displacement: EVO 80ci
- Dimensions (L x W x H): 9.5 in x 4.8 in x 4.6 in
- Weight: 2.5 lbs per pair
- Country of Origin: Mexico
Common questions
What is included in this piston set?
This set includes a pair of pistons, along with all necessary piston rings, wrist pins, and wrist pin locks for installation.
Are these pistons suitable for turbocharged or supercharged engines?
Yes, the 4032 forged alloy construction with high silicon content offers superior resistance to detonation and pre-ignition, making them well-suited for engines with power adders.
Will I need to bore my cylinders for these pistons?
These pistons are .005 oversized, meaning your cylinders will need a light bore and hone to this specific dimension for proper fitment and optimal performance.
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 | 824-01607 |
| WEIGHT | 2.5 lb |
| 9.5 | 1 Compression |
