Kb Pistons Forged Alloy Piston 10.5:1 Standard Bore - 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.
Transform your Harley Sportster 883 into a 1200cc powerhouse with Kb Pistons forged alloy pistons. This standard bore set is engineered for high-performance conversions, providing the strength and reliability needed for both street and race applications.
Why riders pick this
- Forged 4032 alloy for exceptional strength
- Designed for superior crack resistance in high-stress engines
- Ideal for Sportster 883 to 1200cc conversions
- Includes rings, wrist pins, and wrist pin locks
- Coated skirts for smooth operation and longevity
When converting your Sportster 883 to a 1200cc, a robust piston set is critical for durability and performance. Kb Pistons forged alloy pistons are made from 4032 forged alloy with 11% silicon content, offering superior crack resistance under detonation. This makes them an excellent choice for street riders and racers alike, especially those looking to add NOS or supercharger boost to their build.
Power and Durability for Your Sportster Conversion
- 4032 forged alloy with 11% silicon content
- Superior crack resistance under detonation or pre-ignition
- Coated skirts for reduced friction and extended life
- Includes rings, wrist pins, and wrist pin locks for complete assembly
Unlock Your Sportster's Potential
These pistons are the core of a successful 883-to-1200cc conversion, providing the necessary compression and strength for a significant power increase. Their fully machined construction ensures a precise fit and optimal performance, whether you're cruising the streets or hitting the track. Pair these pistons with a performance cam and a proper dyno tune to fully realize the potential of your upgraded Sportster.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB925C.STD
- UPC: 800745154347
- Compression Ratio: 10.5:1
- 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 set?
This set includes a pair of pistons, all necessary piston rings, wrist pins, and wrist pin locks, ready for installation on your 883-to-1200cc conversion.
Are these suitable for boosted Sportster builds?
Yes, the forged 4032 alloy construction provides superior crack resistance, making them well-suited for applications with power adders like NOS or supercharger boost.
Will these fit my Sportster 883 without cylinder modifications?
These are standard bore pistons for an 883-to-1200cc conversion, which typically requires boring your cylinders to the 1200cc specification. Always confirm with your engine builder.
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 | 824-01656 |
| WEIGHT | 2.5 lb |
