Kb Pistons Forged Alloy Piston 10.5:1 .010 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.
Upgrade your Harley Sportster 883 to a 1200cc with Kb Pistons forged alloy pistons. This .010 oversized set is engineered to deliver enhanced durability and performance, perfect for riders seeking a significant power boost.
Why riders pick this
- Forged 4032 alloy for extreme durability
- Enhanced crack resistance against detonation and pre-ignition
- Ideal for Sportster 883 to 1200cc conversions
- Includes rings, wrist pins, and wrist pin locks
- .010 oversized for cylinder boring
When undertaking an 883-to-1200cc conversion on your Sportster, choosing the right pistons is paramount for long-term reliability and power. Kb Pistons forged alloy pistons are manufactured from 4032 forged alloy with 11% silicon content, providing superior crack resistance under detonation and pre-ignition. This robust construction makes them ideal for both street and race applications, especially when incorporating power adders.
Engineered for High-Performance Conversions
- 4032 forged alloy construction for enhanced strength
- Superior crack resistance in high-stress engine environments
- Coated skirts reduce friction and wear for extended life
- Complete kit includes rings, wrist pins, and wrist pin locks
The Foundation for a Powerful Sportster
These .010 oversized pistons are designed to be the heart of a high-performance 883-to-1200cc Sportster conversion. Their precise engineering ensures consistent performance and durability, even under the demands of forced induction or aggressive riding. Pair these pistons with a performance camshaft and a precise dyno tune to unlock the full potential of your upgraded V-twin.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB925C.010
- UPC: 800745154361
- Compression Ratio: 10.5:1
- Size: .010 oversized
- Length: 9.5 in
- Width: 4.8 in
- Height: 4.6 in
- Weight: 2.5 lbs
- Country of Origin: Mexico
Common questions
What is included in this piston kit?
This kit comes with a pair of pistons, all necessary piston rings, wrist pins, and wrist pin locks, providing a complete set for your conversion.
Are these pistons suitable for supercharged Sportster builds?
Yes, the forged 4032 alloy with 11% silicon content offers superior crack resistance, making these pistons well-suited for applications with power adders like superchargers.
Do I need to bore my cylinders for these pistons?
Yes, these are .010 oversized pistons designed for an 883-to-1200cc conversion, which requires boring and honing your cylinders to the correct 1200cc specification.
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 | 824-01658 |
| WEIGHT | 2.5 lb |
