Kb Pistons Hypereutectic Cast Piston 10.5:1 .010 - 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.
Maximize the performance of your Twin Cam 88 engine bored to 95 cubic inches with a Kb Pistons Hypereutectic Cast Piston. This piston features an aggressive 10.5:1 compression ratio and a .010 oversized bore, delivering a noticeable power increase. Its specialized alloy construction ensures superior thermal stability and reduced wear for your air-cooled Harley.
Why riders pick this
- 16% silicon hypereutectic alloy construction
- Low thermal expansion for tight ring seal
- Optimized for 10.5:1 compression ratio
- Suitable for pump fuel (non-boosted)
- Designed for air-cooled engines
The Kb Pistons Hypereutectic Cast Piston is specifically engineered for Twin Cam 88 (TC88) engines that have been bored to 95 cubic inches, delivering a potent 10.5:1 compression ratio. This piston features a .010 oversized bore, providing a fresh surface for cylinder refurbishment. It's cast from a 16% silicon hypereutectic alloy, known for its superior thermal barrier properties and low expansion rate. This design ensures tight piston-to-cylinder clearances, which translates to quieter engine operation and significantly reduced wear, making it an excellent choice for performance-oriented street builds running on pump fuel.
Engineered for Enhanced Power
- Constructed from 16% silicon hypereutectic alloy
- Low thermal expansion ensures tight ring seal
- Optimized for an impressive 10.5:1 compression ratio
- Suitable for use with pump fuel in non-boosted applications
- Designed for air-cooled Harley-Davidson V-twin engines
Achieving Peak Performance
Installing these pistons is a significant step towards unlocking more power from your Twin Cam 88-to-95ci engine. The increased compression ratio will provide a crisper throttle response and stronger acceleration. To fully capitalize on this upgrade, it's highly recommended to pair these pistons with a performance cam and a professional dyno tune. This will ensure your engine's fuel map and timing are perfectly calibrated for the new compression, maximizing power and maintaining reliability.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB411.010
- UPC: 800745152282
- Compression Ratio: 10.5:1
- Engine Size: 95 cubic inches (Twin Cam 88)
- Length: 9.6 in
- Width: 4.9 in
- Height: 4.6 in
- Weight: 3.1 lbs
- Country of Origin: Mexico
Common questions
What compression ratio is this piston designed for?
This piston is designed for a 10.5:1 compression ratio and is best suited for stock or mild builds running on pump fuel.
Why choose hypereutectic instead of forged?
Hypereutectic pistons offer excellent thermal stability, tight clearances for quieter operation, and reduced wear, making them ideal for street applications and mild performance builds on pump fuel.
Will this piston fit my Twin Cam 88 engine without boring?
No, this piston is designed for Twin Cam 88 engines that have been bored to 95 cubic inches with a .010 oversized bore. You will need to bore your cylinders to match.
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 | 824-01369 |
| WEIGHT | 3.1 lb |
| 10.5 | 1 Compression |
