Kb Pistons Cast 9.0:1 .030 Oversized Piston - Harley Sportster 54ci
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.
Unleash the full potential of your Harley Sportster 54ci engine with this high-quality cast piston from KB Pistons. Designed for rebuilds and performance upgrades, this piston delivers a 9.0:1 compression ratio for a noticeable boost in power.
Why riders pick this
- Boosts compression to 9.0:1 for improved power
- Durable cast construction for V-twin reliability
- Designed for 54ci Sportster engines
- Requires .030 inch cylinder overbore
This cast Sportster piston from KB Pistons is engineered for 54 cubic inch (XL) engines, providing a robust foundation for your V-twin's bottom end. With a 9.0:1 compression ratio and a .030 oversized bore, it's the ideal choice for riders looking to refresh their engine with enhanced performance and durability.
Reliable Power for Your Sportster
- Durable cast piston construction for long-lasting performance
- Optimized 9.0:1 compression ratio for street performance
- Designed for 54 cubic inch (XL) Sportster engines
- Requires .030 inch oversized bore for proper fitment
Rebuild with Confidence
Whether you're tackling a full engine rebuild or aiming for a performance bump, this KB Piston offers a precise fit and reliable operation. Ensure your cylinders are bored to the .030 oversized specification by a qualified machine shop before installation to achieve optimal piston-to-wall clearance and ring seal. This piston is a critical component in restoring or enhancing your Sportster's power delivery.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB408C.030
- UPC: 800745151209
- Engine Displacement: 54 cubic inch (XL)
- Compression Ratio: 9.0:1
- Bore Size: .030 oversized
- Weight: 2.5 lbs
- Country of Origin: Mexico
Common questions
What engine size is this piston designed for?
This piston is specifically for Harley-Davidson Sportster 54 cubic inch (XL) engines.
Does this piston require cylinder boring?
Yes, this is a .030 oversized piston, so your cylinders will need to be bored .030 over by a machine shop for correct fitment.
What compression ratio will I get with this piston?
This piston is designed to achieve a 9.0:1 compression ratio in a 54ci Sportster engine.
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 | 824-01203 |
| WEIGHT | 2.5 lb |
| 9.0 | 1 Compression |
