Kb Pistons Cast 10.0:1 .010 Oversized Piston - 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 1200cc with this robust cast piston from KB Pistons. Designed for big-bore conversions, this .010 oversized piston delivers a powerful 10.0:1 compression ratio, perfect for riders seeking serious performance gains.
Why riders pick this
- Enables 883cc to 1200cc Sportster conversion
- Achieves 10.0:1 compression for power
- Durable cast construction
- Requires .010 inch cylinder overbore
This KB Pistons cast piston is specifically engineered for Harley-Davidson Sportster 883 to 1200cc conversions, providing the foundation for a significant increase in engine displacement and power. With a 10.0:1 compression ratio and a .010 oversized diameter, it's designed to fit cylinders that have been machined to accommodate the larger bore, ensuring optimal performance and a tight seal.
Maximize Your 883-to-1200 Conversion
- Key component for 883cc to 1200cc Sportster big-bore conversions
- Delivers a high-performance 10.0:1 compression ratio
- Durable cast construction for demanding V-twin applications
- Features a .010 inch oversized diameter for rebored cylinders
The Core of a Performance Build
When converting your Sportster 883 to a 1200cc, choosing the right piston is crucial for both power and longevity. This KB Piston, with its .010 oversized bore, requires your cylinders to be machined accordingly, creating a perfect match for enhanced efficiency and reduced wear. This piston is built to handle the increased demands of a performance-tuned V-twin, making it an essential upgrade for any serious rider.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB272.010
- UPC: 800745131645
- Compression Ratio: 10.0:1
- Oversized Diameter: .010 in
- Length: 9.5 in
- Width: 4.8 in
- Height: 4.6 in
- Weight: 2.6 lbs
- Country of Origin: Mexico
Common questions
Will this piston fit my 883 Sportster as-is?
No, this is a .010 oversized piston. Your cylinders must be bored .010 over by a machine shop to fit this piston. Stock 883 cylinders require a standard bore piston.
Can I use this for an 883-to-1200 big-bore kit?
Yes, this piston is specifically sized for 883-to-1200 displacement upgrades where cylinders are bored .010 inches over stock.
What compression ratio does this piston provide?
This piston delivers a 10.0:1 compression ratio, which generally requires careful fuel mapping during your dyno tune.
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 | 824-01258 |
| WEIGHT | 2.6 lb |
| 10.0 | 1 Compression |
