Kb Pistons Hypereutectic Cast Piston 9.3:1 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.
Enhance the performance of your Twin Cam 88 to 95ci air-cooled engine with Kb Pistons Hypereutectic Cast Pistons. These pistons are engineered for a 9.3:1 compression ratio and a standard bore, providing a solid foundation for your motor. Their advanced construction ensures quiet operation and reduced wear, making them ideal for stock or mild builds.
Why riders pick this
- 16% silicon hypereutectic alloy
- Low thermal expansion rate
- Tight piston-to-cylinder clearances
- Suitable for stock to mild compression
- Optimized for air-cooled engines
These Kb Pistons Hypereutectic Cast Pistons are specifically designed for Twin Cam 88 to 95 cubic inch air-cooled engines at a standard bore. Featuring a 9.3:1 compression ratio, they are cast with a 16% silicon content, which is crucial for achieving low thermal expansion. This characteristic allows for tighter piston-to-wall clearances, directly contributing to quieter engine operation and significantly reduced wear over the lifespan of your V-twin. They are perfectly suited for builds maintaining stock to mild compression ratios up to 10.5:1.
Key Advantages for Your V-Twin
- Constructed from a 16% silicon hypereutectic alloy
- Exhibits low thermal expansion for optimal fitment
- Maintains tight piston-to-cylinder clearances
- Delivers quieter engine operation and reduced component wear
- Optimized for air-cooled Harley-Davidson engines
Building a Reliable Powerplant
These pistons provide a robust and reliable option for those looking to refresh their Twin Cam engine or embark on a mild performance build. Their standard bore design simplifies installation for engines that haven't been previously bored out. For optimal results, consider pairing these pistons with a compatible cam and ensuring your engine is properly tuned to maximize efficiency and power output.
Specifications
- Brand: KB Pistons
- Manufacturer Part #: KB348.STD
- UPC: 800745068392
- Engine Family: Twin Cam 88 to 95ci
- Bore: Standard
- Compression Ratio: 9.3:1
- Length: 9.6 in
- Width: 4.8 in
- Height: 4.6 in
- Weight: 3 lbs
- Country of Origin: Mexico
Common questions
What compression ratio are these pistons rated for?
These hypereutectic pistons are best suited for stock or mild compression ratios up to 10.5:1 running on pump fuel.
Will these work in my big-bore 98ci or 103ci engine?
No, these pistons are sized for Twin Cam 88 to 95ci displacement at standard bore and are not compatible with larger displacements.
Do I need to bore my cylinders for these pistons?
These pistons are designed for standard bore Twin Cam 88 to 95ci engines, meaning boring may not be necessary if your cylinders are within spec.
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 | 824-01361 |
| WEIGHT | 3.0 lb |
| 9.3 | 1 Compression |
