Keith Black Pistons Pistons KB263.070 for Big Twin 1941-1979
$581.73
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Keith Black Pistons Pistons KB263.070 for Big Twin 1941-1979
$581.73
Engineered for high-demand performance, these Keith Black Pistons hypereutectic alloy pistons feature a 16% silicon content designed specifically for vintage air-cooled engines. The advanced alloy formulation delivers an exceptionally low thermal expansion rate, allowing for tighter piston-to-cylinder operating clearances and superior stability.
Supplied as a complete engine rebuild set, this kit provides reliable combustion efficiency and durability with an 8.5:1 compression ratio tailored for 1200cc Big Twin platforms.
Key Features
| Brand | Keith Black Pistons |
| MPN | KB263.070 |
| Product Type | Engine Piston Kit |
| Material | Hypereutectic Alloy (16% Silicon) |
| Compression Ratio | 8.5:1 |
| Bore Size | 89.1 mm |
| Stroke | 100.8 mm |
| Oversize | +0.070 in. |
| Engine Displacement | 1200cc |
| OEM Replacement | 22149-55C, 22149-74A |
| Shipping Weight | 1.8 kg |
Highlights
- Cast from 16% silicon hypereutectic alloy for reduced thermal expansion
- Allows tighter piston-to-cylinder clearances in air-cooled applications
- Direct replacement for OEM 22149-55C and 22149-74A
- Engineered for an 8.5:1 compression ratio
Compatibility
Fits Harley-Davidson Big Twin models from 1941 to 1979 equipped with a 1200cc engine.
What's included
- 2 x Keith Black Hypereutectic Pistons
- 1 x Complete Piston Ring Set
- 2 x Wrist Pins
- 1 x Set of Wrist Pin Clips
Downloads
Frequently asked questions
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