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KB Performance Pistons

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KB Performance Pistons

KB brand pistons are named after Keith Black, a drag racing pioneer who was a producer of high performance drag racing engines, often used in Top Fuel and Tractor pulling applications. KB pistons are manufactured according to his original designs.

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Products by KB Performance Pistons in our web shop:

KB Hypereutectic Stock Replacement Pistons

These pistons by KB for Harley-Davidson motorcycles are made from Hypereutectic 390 alloy. This low expansion alloy allows for a tighter piston to wall running clearance compared to forged pistons. All pistons feature fully machined crowns and valve reliefs. The wrist pins are full floating. KB pistons are sold as pairs and include piston rings and triple wound spiral locks.

KB Hypereutectic High Performance Pistons

Used for boring 883 Sportsters to 1200, these KB High Performance pistons are made from Hypereutectic 390 alloy. This low expansion alloy allows for a tighter piston to wall running clearance compared to forged pistons. The pistons feature fully machined crowns and valve reliefs. The wrist pins are full floating. KB pistons are sold as pairs and include piston rings and triple wound spiral locks.

KB Forged Pistons 883cc→1200cc

These KB Performance pistons for Harley-Davidson motorcycles are forged from low expansion 4032 alloy. They are preferred for high performance / high compression applications. KB pistons are sold as pairs and include piston rings and triple wound spiral locks.

Pistons by KB Performance Pistons; fits 1200 cc / 74 cui. Knucklehead, Panhead, Shovelhead; aluminum; Over-/Undersize: +0.000 ”; stroke: 3-31/32 ”; nominal bore: 3-7/16 ”; 1200 cm³; compression: 8:1; outer Ø: 87.27 mm; USA; gross weight: 1.2 kg

Pistons by KB Performance Pistons; fits 1200 cc / 74 cui. Knucklehead, Panhead, Shovelhead; aluminum; Over-/Undersize: +0.010 ”; stroke: 3-31/32 ”; nominal bore: 3-7/16 ”; 1200 cm³; compression: 8:1; USA; gross weight: 1.2 kg

Pistons by KB Performance Pistons; fits 1200 cc / 74 cui. Knucklehead, Panhead, Shovelhead; aluminum; Over-/Undersize: +0.020 ”; stroke: 3-31/32 ”; nominal bore: 3-7/16 ”; 1200 cm³; compression: 8:1; USA; gross weight: 1.3 kg

Pistons by KB Performance Pistons; fits 1200 cc / 74 cui. Knucklehead, Panhead, Shovelhead; aluminum; Over-/Undersize: +0.030 ”; stroke: 3-31/32 ”; nominal bore: 3-7/16 ”; 1200 cm³; compression: 8:1; outer Ø: 88.02 mm; USA; gross weight: 1.2 kg

Pistons by KB Performance Pistons; fits 1200 cc / 74 cui. Knucklehead, Panhead, Shovelhead; aluminum; Over-/Undersize: +0.040 ”; stroke: 3-31/32 ”; nominal bore: 3-7/16 ”; 1200 cm³; compression: 8:1; USA; gross weight: 1.27 kg

Pistons by KB Performance Pistons; fits Evolution Sportster 1986-2008; aluminum; Over-/Undersize: +0.000 ”; stroke: 3-13/16 ”; nominal bore: 3 ”; 883 cm³; compression: 9:1; USA; gross weight: 900 g

Pistons by KB Performance Pistons; fits Evolution Sportster 1986-2008; aluminum; Over-/Undersize: +0.010 ”; stroke: 3-13/16 ”; nominal bore: 3 ”; 883 cm³; compression: 9:1; USA; gross weight: 911.6 g

Pistons by KB Performance Pistons; fits Evolution Sportster 1986-2008; aluminum; Over-/Undersize: +0.020 ”; stroke: 3-13/16 ”; nominal bore: 3 ”; 883 cm³; compression: 9:1; USA; gross weight: 912.4 g

Pistons by KB Performance Pistons; fits Evolution Sportster 1986-2008; aluminum; Over-/Undersize: +0.030 ”; stroke: 3-13/16 ”; nominal bore: 3 ”; 883 cm³; compression: 9:1; USA; gross weight: 898.2 g

Pistons by KB Performance Pistons; fits Evolution Sportster 1986-2008; aluminum; Over-/Undersize: +0.040 ”; stroke: 3-13/16 ”; nominal bore: 3 ”; 883 cm³; compression: 9:1; USA; gross weight: 925.8 g

Pistons by KB Performance Pistons; fits Evolution Sportster 1200cc 1988-2020; aluminum, 1.1 mm deeper valve pockets for high lift cams; Over-/Undersize: +0.000 ”; stroke: 3-13/16 ”; nominal bore: 3-1/2 ”; 1200 cm³; compression: 9:1; USA; gross weight: 1.2 kg

Pistons by KB Performance Pistons; fits Evolution Sportster 1200cc 1988-2020; aluminum, 1.1 mm deeper valve pockets for high lift cams; Over-/Undersize: +0.010 ”; stroke: 3-13/16 ”; nominal bore: 3-1/2 ”; 1200 cm³; compression: 9:1; USA; gross weight: 1.19 kg

Pistons by KB Performance Pistons; fits Evolution Sportster 1200cc 1988-2020; aluminum, 1.1 mm deeper valve pockets for high lift cams; Over-/Undersize: +0.020 ”; stroke: 3-13/16 ”; nominal bore: 3-1/2 ”; 1200 cm³; compression: 9:1; USA; gross weight: 1.2 kg

Pistons »domed« by KB Performance Pistons; fits Evolution Big Twin 1984-1999; aluminum; Over-/Undersize: +0.000 ”; stroke: 4-1/4 ”; nominal bore: 3-1/2 ”; 1340 cm³; compression: 9.6:1; USA; gross weight: 1.25 kg

Pistons »domed« by KB Performance Pistons; fits Evolution Big Twin 1984-1999; aluminum; Over-/Undersize: +0.005 ”; stroke: 4-1/4 ”; nominal bore: 3-1/2 ”; 1340 cm³; compression: 9.6:1; USA; gross weight: 1.25 kg

Pistons »domed« by KB Performance Pistons; fits Evolution Big Twin 1984-1999; aluminum; Over-/Undersize: +0.010 ”; stroke: 4-1/4 ”; nominal bore: 3-1/2 ”; 1340 cm³; compression: 9.6:1; USA; gross weight: 1.26 kg

Pistons »domed« by KB Performance Pistons; fits Evolution Big Twin 1984-1999; aluminum; Over-/Undersize: +0.020 ”; stroke: 4-1/4 ”; nominal bore: 3-1/2 ”; 1340 cm³; compression: 9.6:1; USA; gross weight: 1.3 kg

Pistons »domed« by KB Performance Pistons; fits Evolution Big Twin 1984-1999; aluminum; Over-/Undersize: +0.030 ”; stroke: 4-1/4 ”; nominal bore: 3-1/2 ”; 1340 cm³; compression: 9.6:1; USA; gross weight: 1.3 kg