Kb Pistons Forged Alloy 9.5:1 .020 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.
Maximize the power and durability of your Harley Evolution 80ci engine with Kb Pistons forged alloy pistons. These pistons feature a 9.5:1 compression ratio and a .020 oversized bore, ideal for a robust engine rebuild.
Why riders pick this
- 9.5:1 compression ratio for increased power output
- .020 oversized bore for comprehensive cylinder refresh
- Forged 4032 alloy for ultimate crack resistance
- Coated skirts for reduced friction and extended life
- Includes all rings, wrist pins, and wrist pin locks
When undertaking a serious rebuild or performance upgrade on your Evolution 80ci engine, the foundation matters. This Kb Pistons forged alloy piston kit is designed to deliver, offering a substantial 9.5:1 compression ratio for improved power and throttle response. The .020 oversized bore provides the perfect opportunity to bore and hone your cylinders to a precise dimension, ensuring optimal ring seal and preparing your engine for high performance.
Engineered for Extreme Durability
- Crafted from 4032 forged alloy with 11% silicon content for maximum strength
- Offers superior resistance to cracking and pre-ignition under severe operating conditions
- Coated skirts reduce friction and extend the lifespan of the piston and cylinder walls
- Comes as a complete kit, including all necessary rings, wrist pins, and wrist pin locks
Built for Boost and High-Performance Builds
These pistons are an excellent choice for any EVO 80ci build, particularly those incorporating power adders like nitrous oxide or superchargers. The robust forged construction ensures they can handle the increased cylinder pressures and temperatures associated with high-output applications. For the best results, pair these pistons with a performance cam, a quality intake, and a custom dyno tune to fully unleash your V-twin's potential.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB920C.020
- UPC: 800745155320
- Compression Ratio: 9.5:1
- Bore Size: .020 over
- Engine: EVO 80ci
- Length: 9.6 in
- Width: 4.8 in
- Height: 4.6 in
- Weight: 2.8 lbs
- Country of Origin: Mexico
Common questions
What is included with this piston kit?
This kit provides a pair of pistons, complete with all necessary piston rings, wrist pins, and wrist pin locks for installation.
Are these pistons suitable for engines using power adders?
Yes, the 4032 forged alloy construction with 11% silicon content is specifically engineered to handle the added stress and heat from power adders like nitrous or superchargers.
Do my cylinders need to be bored for these pistons?
Yes, these pistons are .020 oversized, which means your cylinders will require boring and honing 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 | 824-01609 |
| WEIGHT | 2.8 lb |
| 9.5 | 1 Compression |
