Keith Black Pistons Dome Top Pistons KB305.STD for Big Twin 1984-1999
$597.31
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Keith Black Pistons Dome Top Pistons KB305.STD for Big Twin 1984-1999
$597.31
Upgrade your air-cooled engine with these Keith Black hypereutectic alloy dome top pistons, engineered with a 16% silicon content cast material for high durability and performance. Designed to yield a 9.6:1 compression ratio with 80cc head chamber volume, they offer a low thermal expansion rate that permits tighter piston-to-cylinder operating clearances.
This complete piston kit is tailored for 1984-1999 Big Twin Evolution engines, delivering reliable power and optimized combustion efficiency. Each kit includes two standard bore pistons, piston rings, wrist pins, and clips for a thorough top-end rebuild.
Key Features
| Brand | Keith Black Pistons |
| MPN | KB305.STD |
| Product Type | Dome Top Pistons |
| Material | Hypereutectic Alloy (cast 16% silicon content) |
| Bore | 88.8 mm |
| Stroke | 108 mm |
| Compression Ratio | 9.6:1 |
| Head Chamber Volume | 80cc |
| Fitment | Big Twin 1984-1999 with Evo Engine |
| Product Weight | 1.8 kg |
Highlights
- Engineered with hypereutectic 16% silicon cast alloy for low thermal expansion
- Enables tighter piston-to-cylinder clearance ideal for air-cooled engines
- Yields a 9.6:1 compression ratio with 80cc combustion chambers
- Standard bore specification measuring 88.8 mm with a 108 mm stroke
Compatibility
Fits 1984-1999 Harley-Davidson Big Twin models equipped with the Evolution (Evo) engine.
What's included
- 2 x Keith Black Hypereutectic Pistons
- 1 x Piston Ring Set
- 2 x Wrist Pins
- 4 x Retaining Clips
Downloads
Frequently asked questions
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