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KB Performance V-Twin Piston and Ring Kits KB912C.STD
Part Number: UEM-KB912C-STD
KB Performance V-Twin Piston and Ring Kits
Piston and Ring Kit, Forged, 4.125 in. Bore, Harley-Davidson®, 10.50:1 Compression Ratio, Kit
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Estimated Ship Date: Feb 26, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
KB912C.STD
Part Type:
Product Line:
Summit Racing Part Number:
UEM-KB912C-STD
UPC:
800745194404
Piston Material:
Forged aluminum
Bore (in.):
4.125 in.
Stroke:
4.000 in.
Rod Length:
7.667 in.
Wrist Pin Style:
Floating
Wrist Pin Retainers Included:
Yes
Top Ring Material:
Iron
Top Ring Facing Material:
Moly
Second Ring Material:
Iron
Second Ring Facing Material:
Cast iron
Oil Ring Material:
Stainless steel
File Fit:
No
Gapless:
No
Gaskets Included:
No
Quantity:
Sold as a kit.
Notes:
Piston has an anti-friction skirt coating.
KB Performance V-Twin Piston and Ring Kits
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.
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