Keith Black Pistons Dome Top Pistons KB305.030 for Big Twin 1984-1999
$597.31
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Keith Black Pistons Dome Top Pistons KB305.030 for Big Twin 1984-1999
$597.31
These Keith Black dome top pistons are precision-engineered from high-grade hypereutectic 16% silicon alloy, offering exceptional thermal stability for air-cooled Harley-Davidson Big Twin Evolution engines. The low thermal expansion rate allows for tighter piston-to-cylinder operating clearances, ensuring optimal sealing, improved engine efficiency, and quiet performance.
Delivering a 9.6:1 compression ratio with standard 80cc combustion chambers, this piston set includes two pistons, rings, wrist pins, and clips for a complete top-end upgrade. Built to withstand high-demand riding, they provide reliable power delivery and long-lasting durability.
Key Features
| Brand | Keith Black Pistons |
| Manufacturer Part Number | KB305.030 |
| Product Type | Dome Top Pistons |
| Bore Size | 89.6 mm |
| Stroke | 108 mm |
| Material | Cast 16% Silicon Hypereutectic Alloy |
| Compression Ratio | 9.6:1 (with 80cc chamber) |
| Oversize | +0.76 mm (+.030 in.) |
| Engine Compatibility | Harley-Davidson Big Twin Evolution 1984-1999 |
| Estimated Shipping Weight | 1.8 kg |
Highlights
- Cast 16% silicon hypereutectic alloy design ideal for air-cooled engines
- Low thermal expansion allows for tight piston-to-wall clearance
- Delivers a 9.6:1 compression ratio with 80cc combustion chambers
- Engineered for 89.6 mm bore and 108 mm stroke specifications
Compatibility
Compatible with Harley-Davidson Big Twin Evolution (Evo) engines from model years 1984 to 1999.
What's included
- 2 x Keith Black Hypereutectic Pistons (+.030 in.)
- 1 x Complete Set of Piston Rings
- 2 x Wrist Pins
- 1 x Set of Wrist Pin Clips
Downloads
Frequently asked questions
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