Kb Pistons Hypereutectic Cast Piston 10.5:1 Standard Bore - Harley Twin Cam 88 to 95ci
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.
Achieve a significant performance boost in your Twin Cam 88 engine bored to 95 cubic inches with Kb Pistons Hypereutectic Cast Pistons. These pistons feature a 10.5:1 compression ratio and a standard bore, providing increased power potential. Their advanced alloy construction ensures excellent thermal stability and reduced wear for your air-cooled V-twin.
Why riders pick this
- 16% silicon hypereutectic alloy
- Low thermal expansion rate
- Tight piston-to-cylinder clearances
- Optimized for 10.5:1 compression ratio
- Standard bore size
These Kb Pistons Hypereutectic Cast Pistons are engineered to transform your Twin Cam 88 (TC88) engine when bored to 95 cubic inches. Featuring a robust 10.5:1 compression ratio and a standard bore, they are cast with a substantial 16% silicon content. This specific alloy minimizes thermal expansion, allowing for tighter piston-to-cylinder clearances that are essential for air-cooled applications. The result is improved ring seal, quieter engine operation, and significantly reduced wear, making these pistons ideal for stock or mild compression builds running on pump fuel.
Performance-Enhancing Design
- 16% silicon hypereutectic alloy for superior thermal properties
- Low thermal expansion maintains tight piston clearances
- Optimized for an aggressive 10.5:1 compression ratio
- Contributes to improved ring seal and quieter running
- Standard bore size for straightforward installation
Optimizing Your Engine's Potential
With these pistons, you're setting the stage for a noticeable increase in power and responsiveness from your Twin Cam. The 10.5:1 compression ratio is a sweet spot for street performance, offering a strong pull without demanding exotic fuels. To fully leverage this upgrade, consider a performance camshaft designed for higher compression and a professional dyno tune to ensure optimal air/fuel delivery and ignition timing.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB411.STD
- UPC: 800745152244
- Engine: Twin Cam 88 (TC88) / 95 cubic inches
- Compression Ratio: 10.5:1
- Length: 9.5 in
- Width: 4.8 in
- Height: 4.6 in
- Weight: 3.1 lbs
- Country of Origin: Mexico
Common questions
What fuel should I run with these pistons?
These hypereutectic pistons are designed for pump fuel on engines up to 10.5:1 compression. Higher ratios or boost may require premium or race fuel.
Will these pistons fit my stock Twin Cam 88 engine?
These pistons are designed for Twin Cam 88 engines that have been bored to 95 cubic inches. They will not fit an untouched 88ci cylinder.
Do I need to tune my bike after installing these pistons?
Yes, installing pistons with a higher compression ratio requires a proper dyno tune to optimize fuel delivery and ignition timing, ensuring peak performance and engine longevity.
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 | 824-01367 |
| WEIGHT | 3.1 lb |
| 10.5 | 1 Compression |
