Keith Black Pistons Dome Top Pistons KB921C.010 for Big Twin 1984-1999
$727.16
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Keith Black Pistons Dome Top Pistons KB921C.010 for Big Twin 1984-1999
$727.16
These premium forged Keith Black dome top pistons are precision engineered from 4032 alloy with 11% silicon content, formed in a forging press and fully machined for superior durability. Designed specifically for high-compression performance applications, they deliver exceptional resistance to cracking under demanding engine conditions.
The complete set delivers an optimal 10.5:1 compression ratio when paired with standard 80cc head chamber volumes on compatible V-twin engines. Each package provides everything required for assembly, ensuring reliable performance and strength for your engine rebuild.
Key Features
| Brand | Keith Black Pistons |
| Manufacturer Part Number | KB921C.010 |
| Fitment | Big Twin 1984-1999 |
| Piston Style | Dome Top |
| Oversize | +0.25 mm (+.010 in) |
| Bore Size | 89.1 mm |
| Stroke | 107.95 mm |
| Compression Ratio | 10.5:1 with 80cc Head Chamber Volume |
| Material | Forged 4032 Alloy (11% silicon alloy) |
| Piston to Wall Clearance | Requires 0.025 mm wider clearance |
| Item Condition | New |
Highlights
- Forged from 4032 alloy with 11% silicon for maximum strength
- Dome top profile delivering a 10.5:1 compression ratio with 80cc heads
- Superior resistance to cracking under high-compression performance loads
- Complete set including pistons, rings, pins, and clips
Compatibility
Fits Big Twin Evolution models from 1984 to 1999 with an 89.1 mm bore and 107.95 mm stroke configuration.
What's included
- 2 x Keith Black Forged Pistons
- 1 x Matching Piston Ring Set
- 2 x Wrist Pins
- 1 x Set of Retaining Clips
Downloads
Frequently asked questions
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