Kb Pistons Hypereutectic Cast 8.8:1 .010 Oversized Piston - Harley Twin Cam 88ci
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.
Enhance the durability and performance of your Harley Twin Cam 88ci engine with this hypereutectic cast piston from KB Pistons. Featuring an 8.8:1 compression ratio and a .010 oversized bore, this piston is engineered for tight ring seal and low thermal expansion, ideal for air-cooled V-twins.
Why riders pick this
- 16% silicon hypereutectic alloy for durability
- Low thermal expansion for consistent performance
- Tight clearances reduce noise and wear
- 8.8:1 compression ratio for Twin Cam 88ci
- Requires .010 inch cylinder overbore
This KB Pistons hypereutectic cast piston is specifically designed for Twin Cam 88 cubic inch engines, offering a superior alternative for engine rebuilds and mild performance upgrades. Crafted from a 16% high-silicon alloy, these pistons are known for their tight piston-to-cylinder wall clearances and reduced thermal expansion, which translates to less engine noise and extended component life in your air-cooled Harley.
Advanced Design for Twin Cam Reliability
- Constructed from durable 16% silicon hypereutectic alloy
- Exhibits low thermal expansion for consistent performance
- Promotes tight piston-to-cylinder wall clearances for efficiency
- Reduces engine noise and wear, extending engine life
- Supports stock to mild compression ratios up to 10.5:1
The Smart Choice for Air-Cooled Engines
Hypereutectic pistons are an excellent choice for air-cooled Harley engines running pump fuel, providing a balance of strength and thermal stability that is crucial for sustained performance. This .010 oversized piston is intended for cylinders that have been machined to match, ensuring a precise fit and optimal combustion. When rebuilding your Twin Cam 88ci, choosing these pistons means investing in long-term reliability and a smooth-running engine.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB425C.010
- UPC: 800745067715
- Bore Size: .010 oversized
- Compression Ratio: 8.8:1
- Engine: Twin CAM 88ci
- Weight: 2.85 lbs
- Country of Origin: Mexico
Common questions
What compression ratio do these pistons support?
These hypereutectic pistons are designed for an 8.8:1 compression ratio in a Twin Cam 88ci engine and can support up to 10.5:1 with proper tuning and fuel.
Are these for .010 overbore or stock bore?
These are .010 oversized pistons, meaning your cylinders must be bored .010 over by a machine shop for correct installation.
What are the benefits of a hypereutectic piston?
Hypereutectic pistons offer excellent durability, low thermal expansion, and tight clearances, which contribute to reduced engine noise and wear in air-cooled V-twin engines.
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 | 824-01352 |
| WEIGHT | 2.85 lb |
| 8.8 | 1 Compression |
