Keith Black Pistons Dome Top Pistons KB305.020 for Big Twin 1984-1999
$597.31
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Keith Black Pistons Dome Top Pistons KB305.020 for Big Twin 1984-1999
$597.31
These Keith Black dome top pistons are precision-engineered for Harley-Davidson Big Twin Evolution engines from 1984 through 1999. Crafted from high-strength hypereutectic alloy with 16% silicon content, they deliver low thermal expansion for tighter piston-to-cylinder clearances and maximum thermal stability in air-cooled applications.
Offering a 9.6:1 compression ratio with an 80cc combustion chamber volume, this complete +0.5 mm oversize kit delivers optimized power and reliable performance. Each package includes matched pistons, rings, wrist pins, and spiral locks for a full engine rebuild.
Key Features
| Brand | Keith Black Pistons |
| Manufacturer Part Number (MPN) | KB305.020 |
| Piston Style | Dome Top |
| Bore Size | 89.4 mm |
| Stroke | 108 mm |
| Oversize | +0.5 mm (+.020 in.) |
| Compression Ratio | 9.6:1 (with 80cc chamber volume) |
| Material | Hypereutectic Alloy (16% Silicon) |
| Engine Compatibility | Big Twin Evolution (1984-1999) |
| Product Weight | 1.2 kg |
Highlights
- Cast from 16% silicon hypereutectic alloy for high strength and wear resistance
- Low thermal expansion rate allows tighter piston-to-cylinder operating clearances
- Achieves a 9.6:1 compression ratio with standard 80cc heads
- Engineered specifically for optimal cooling and performance in air-cooled V-Twin engines
Compatibility
Fits Harley-Davidson Big Twin Evolution (Evo) engines from 1984 to 1999 with 89.4 mm bore requirements.
What's included
- 2 x Keith Black Hypereutectic Pistons
- 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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