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KB V-Twin

KB Performance V-Twin Piston and Ring Kits

4.79 out of 5 stars 19 Customer Reviews

KB Performance V-Twin piston and ring kits bring all of the knowledge and experience of a legendary engine builder to the world of high performance motorcycles. These pistons use the latest manufacturing techniques and standards to ensure quality and maximum available performance. The kits are offered in hypereutectic 390 alloy and forged 4032 low-expansion alloy. KB Performance V-Twin piston and ring kits are available for Harley-Davidson® and Indian motorcycles in a variety of engine sizes and compression ratios.

Showing In Stock Items. Show All 81 Items.

Results 1 - 25 of 67

KB Performance V-Twin Piston and Ring Kits KB915C.STD

KB Performance V-Twin Piston and Ring Kits KB915C.STD

KB Performance V-Twin Piston and Ring Kits KB915C.STD

Piston and Ring Kit, Forged, 4.000 in. Bore, Harley-Davidson®, 10.50:1 Compression Ratio, Kit

Part Number: UEM-KB915C-STD

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB305.010

KB Performance V-Twin Piston and Ring Kits KB305.010

KB Performance V-Twin Piston and Ring Kits KB305.010

Piston and Ring Kit, Hypereutectic, 3.508 in. Bore, Cast Iron Rings, Harley-Davidson®, Kit

Part Number: UEM-KB305-010

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

KB Performance V-Twin Piston and Ring Kits KB906C.005

KB Performance V-Twin Piston and Ring Kits KB906C.005

KB Performance V-Twin Piston and Ring Kits KB906C.005

Piston and Ring Kit, Forged, 3.880 in. Bore, Harley-Davidson®, 10.50:1 Compression Ratio, Kit

Part Number: UEM-KB906C-005

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB348.010

KB Performance V-Twin Piston and Ring Kits KB348.010

KB Performance V-Twin Piston and Ring Kits KB348.010

Piston and Ring Kit, Hypereutectic, 3.885 in. Bore, Harley-Davidson®, 9.30:1 Compression Ratio, Kit

Part Number: UEM-KB348-010

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB305.STD

KB Performance V-Twin Piston and Ring Kits KB305.STD

KB Performance V-Twin Piston and Ring Kits KB305.STD

Piston and Ring Kit, Hypereutectic, 3.498 in. Bore, Cast Iron Rings, Harley-Davidson®, Kit

Part Number: UEM-KB305-STD

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB305.020

KB Performance V-Twin Piston and Ring Kits KB305.020

KB Performance V-Twin Piston and Ring Kits KB305.020

Piston and Ring Kit, Hypereutectic, 3.518 in. Bore, Cast Iron Rings, Harley-Davidson®, Kit

Part Number: UEM-KB305-020

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB305.005

KB Performance V-Twin Piston and Ring Kits KB305.005

KB Performance V-Twin Piston and Ring Kits KB305.005

Piston and Ring Kit, Hypereutectic, 3.503 in. Bore, Cast Iron Rings, Harley-Davidson®, Kit

Part Number: UEM-KB305-005

Not Yet Reviewed

Estimated Ship Date: Jan 21, 2026 if ordered today

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Estimated Ship Date: Jan 21, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB425C.010

KB Performance V-Twin Piston and Ring Kits KB425C.010

KB Performance V-Twin Piston and Ring Kits KB425C.010

Piston Set, KB Hyper Twin Cam 88 (88ci) 1998-2006 Rod-7.667 Bore-3.750 Stroke-4.000 C.H. 1.270 Flat Top +1cc

Part Number: UEM-KB425C010

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB266.020

KB Performance V-Twin Piston and Ring Kits KB266.020

KB Performance V-Twin Piston and Ring Kits KB266.020

Piston and Ring Kit, Hypereutectic, 3.518 in. Bore, Harley-Davidson®, 10.50;1 Compression Ratio, Kit

Part Number: UEM-KB266-020

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB905C.005

KB Performance V-Twin Piston and Ring Kits KB905C.005

KB Performance V-Twin Piston and Ring Kits KB905C.005

Piston and Ring Kit, Forged, 3.880 in. Bore, Harley-Davidson®, 10.00:1 Compression Ratio, Kit

Part Number: UEM-KB905C-005

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB918C.020

KB Performance V-Twin Piston and Ring Kits KB918C.020

KB Performance V-Twin Piston and Ring Kits KB918C.020

Piston and Ring Kit, Forged, 4.145 in. Bore, Harley-Davidson®, 10.50:1 Compression Ratio, Kit

Part Number: UEM-KB918C-020

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB916C.010

KB Performance V-Twin Piston and Ring Kits KB916C.010

KB Performance V-Twin Piston and Ring Kits KB916C.010

Piston and Ring Kit, Forged, 4.135 in. Bore, Harley-Davidson®, 9.50:1 Compression Ratio, Kit

Part Number: UEM-KB916C-010

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB266.030

KB Performance V-Twin Piston and Ring Kits KB266.030

KB Performance V-Twin Piston and Ring Kits KB266.030

Piston and Ring Kit, Hypereutectic, 3.528 in. Bore, Harley-Davidson®, 10.50;1 Compression Ratio, Kit

Part Number: UEM-KB266-030

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB266.005

KB Performance V-Twin Piston and Ring Kits KB266.005

KB Performance V-Twin Piston and Ring Kits KB266.005

Piston and Ring Kit, Hypereutectic, 3.503 in. Bore, Harley-Davidson®, 10.50;1 Compression Ratio, Kit

Part Number: UEM-KB266-005

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB258.005

KB Performance V-Twin Piston and Ring Kits KB258.005

KB Performance V-Twin Piston and Ring Kits KB258.005

Piston and Ring Kit, Hypereutectic, 3.503 in. Bore, Harley-Davidson®, 8.60;1 Compression Ratio, Kit

Part Number: UEM-KB258-005

Not Yet Reviewed

Estimated Ship Date: Jan 21, 2026 if ordered today

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Estimated Ship Date: Jan 21, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB258.030

KB Performance V-Twin Piston and Ring Kits KB258.030

KB Performance V-Twin Piston and Ring Kits KB258.030

Piston and Ring Kit, Hypereutectic, 3.528 in. Bore, Harley-Davidson®, 8.60;1 Compression Ratio, Kit

Part Number: UEM-KB258-030

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Jan 21, 2026 if ordered today

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Estimated Ship Date: Jan 21, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB904C.005

KB Performance V-Twin Piston and Ring Kits KB904C.005

KB Performance V-Twin Piston and Ring Kits KB904C.005

Piston and Ring Kit, Forged, 3.880 in. Bore, Harley-Davidson®, 9.25:1 Compression Ratio, Kit

Part Number: UEM-KB904C-005

Not Yet Reviewed

Estimated Ship Date: Jan 21, 2026 if ordered today

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Estimated Ship Date: Jan 21, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB904C.010

KB Performance V-Twin Piston and Ring Kits KB904C.010

KB Performance V-Twin Piston and Ring Kits KB904C.010

Piston and Ring Kit, Forged, 3.885 in. Bore, Harley-Davidson®, 9.25:1 Compression Ratio, Kit

Part Number: UEM-KB904C-010

Not Yet Reviewed

Estimated Ship Date: Jan 21, 2026 if ordered today

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Estimated Ship Date: Jan 21, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB305.040

KB Performance V-Twin Piston and Ring Kits KB305.040

KB Performance V-Twin Piston and Ring Kits KB305.040

Piston and Ring Kit, Hypereutectic, 3.538 in. Bore, Cast Iron Rings, Harley-Davidson®, Kit

Part Number: UEM-KB305-040

Not Yet Reviewed

Estimated Ship Date: Jan 21, 2026 if ordered today

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Estimated Ship Date: Jan 21, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB348.020

KB Performance V-Twin Piston and Ring Kits KB348.020

KB Performance V-Twin Piston and Ring Kits KB348.020

Piston and Ring Kit, Hypereutectic, 3.895 in. Bore, Harley-Davidson®, 9.30:1 Compression Ratio, Kit

Part Number: UEM-KB348-020

Not Yet Reviewed

Estimated Ship Date: Jan 21, 2026 if ordered today

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Estimated Ship Date: Jan 21, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB258.020

KB Performance V-Twin Piston and Ring Kits KB258.020

KB Performance V-Twin Piston and Ring Kits KB258.020

Piston and Ring Kit, Hypereutectic, 3.518 in. Bore, Harley-Davidson®, 8.60;1 Compression Ratio, Kit

Part Number: UEM-KB258-020

Not Yet Reviewed

Estimated Ship Date: Jan 21, 2026 if ordered today

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Estimated Ship Date: Jan 21, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB917C.030

KB Performance V-Twin Piston and Ring Kits KB917C.030

KB Performance V-Twin Piston and Ring Kits KB917C.030

Piston and Ring Kit, Forged, 4.155 in. Bore, Harley-Davidson®, 10.00:1 Compression Ratio, Kit

Part Number: UEM-KB917C-030

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB918C.005

KB Performance V-Twin Piston and Ring Kits KB918C.005

KB Performance V-Twin Piston and Ring Kits KB918C.005

Piston and Ring Kit, Forged, 4.130 in. Bore, Harley-Davidson®, 10.50:1 Compression Ratio, Kit

Part Number: UEM-KB918C-005

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB918C.010

KB Performance V-Twin Piston and Ring Kits KB918C.010

KB Performance V-Twin Piston and Ring Kits KB918C.010

Piston and Ring Kit, Forged, 4.135 in. Bore, Harley-Davidson®, 10.50:1 Compression Ratio, Kit

Part Number: UEM-KB918C-010

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

KB Performance V-Twin Piston and Ring Kits KB918C.030

KB Performance V-Twin Piston and Ring Kits KB918C.030

KB Performance V-Twin Piston and Ring Kits KB918C.030

Piston and Ring Kit, Forged, 4.155 in. Bore, Harley-Davidson®, 10.50:1 Compression Ratio, Kit

Part Number: UEM-KB918C-030

Not Yet Reviewed

Estimated Ship Date: Jan 22, 2026 if ordered today

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Estimated Ship Date: Jan 22, 2026 if ordered today

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