Kb Pistons Forged Alloy Piston 10.5:1 .020 Oversized - Harley Sportster 883 to 1200 Conversion
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.
Experience a significant power upgrade on your Harley Sportster 883 with Kb Pistons forged alloy pistons for 1200cc conversions. This .020 oversized set is built for riders demanding maximum performance and reliability in their V-twin.
Why riders pick this
- 4032 forged alloy construction for extreme durability
- Enhanced crack resistance against detonation or pre-ignition
- Ideal for Sportster 883 to 1200cc conversions
- Includes all rings, wrist pins, and wrist pin locks
- .020 oversized for precise cylinder boring
For an optimal 883-to-1200cc Sportster conversion, durable and high-performing pistons are essential. Kb Pistons forged alloy pistons are crafted from 4032 forged alloy with 11% silicon content, delivering superior crack resistance under detonation and pre-ignition. This makes them an excellent choice for high-output street or race applications, especially when running power adders like NOS or boost.
Robust Construction for Enhanced Performance
- Forged 4032 alloy with 11% silicon for exceptional strength
- Superior crack resistance in high-stress engine conditions
- Coated skirts for reduced friction and extended component life
- Includes all rings, wrist pins, and wrist pin locks for complete assembly
The Heart of a Transformed Sportster
These .020 oversized pistons provide the solid foundation for a powerful and reliable 883-to-1200cc Sportster conversion. Their fully machined construction ensures precise fitment and optimal performance, crucial for an engine operating at higher output. Pair these pistons with a performance cam and a custom dyno tune to fully unleash the potential of your upgraded Harley-Davidson Sportster.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB925C.020
- UPC: 800745154378
- Compression Ratio: 10.5:1
- Oversized: .020 in
- Length: 9.5 in
- Width: 4.8 in
- Height: 4.6 in
- Weight: 2.5 lbs
- Country of Origin: Mexico
Common questions
What's included with this piston kit?
This kit contains a pair of pistons, all necessary rings, wrist pins, and wrist pin locks, providing everything you need for the conversion.
Can these pistons be used with power adders?
Yes, the robust 4032 forged alloy construction provides superior crack resistance, making them well-suited for applications utilizing power adders like NOS or turbo boost.
Will these pistons fit my Sportster 883 without modification?
These are .020 oversized pistons for an 883-to-1200cc conversion, which means your cylinders will require boring and honing to the correct 1200cc specification for proper installation.
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 | 824-01659 |
| WEIGHT | 2.5 lb |
