KB Performance
KB Performance is a trusted manufacturer of high-performance motorcycle pistons engineered for strength, efficiency and consistent combustion. Widely known for KB Performance piston kits, the brand supports engine builds with precision-fit solutions for Twin Cam, Evolution, Sportster and Milwaukee-Eight platforms. Riders and engine builders rely on KB pistons for accurate compression ratios, durable construction and dependable performance across street and high-output applications.
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Kb Performance - KB662C.STD - Piston Kit - 4.125" Standard - 10.0:1 CR - 96"/103" Twin Cam Bored to 117 CI w/SE 95 cc Heads
KB Performance
$322.95Kb Performance - KB662C.STD - Piston Kit - 4.125" Standard - 10.0:1 CR - 96"/103" Twin Cam Bored to 117 CI w/SE 95 cc HeadsFeaturesOffset pin design for quiet operationEach kit contains two pistons,...$322.95 -
Out of stock
Kb Performance - KB660C.005 - Piston Kit - 3.875" +0.005" - 10.0:1 CR - 103" Twin Cam | 96" Big Bore to 103" w/SE 95 cc Heads
KB Performance
$322.95Kb Performance - KB660C.005 - Piston Kit - 3.875" +0.005" - 10.0:1 CR - 103" Twin Cam | 96" Big Bore to 103" w/SE 95 cc HeadsFeaturesOffset pin design for quiet operationEach kit contains two...$322.95 -
Out of stock
Kb Performance - KB909LCA.STD - Piston Kit - 3.875" Standard - 11.0:1 CR - 103" Twin Cam | Big Bore 96" to 103" w/ 85 cc Heads
KB Performance
$410.95Kb Performance - KB909LCA.STD - Piston Kit - 3.875" Standard - 11.0:1 CR - 103" Twin Cam | Big Bore 96" to 103" w/ 85 cc HeadsFeaturesNew skirt coating technology is applied to the entire thickness...$410.95 -
Out of stock
Kb Performance - KB661C.STD - Piston Kit - 4.000" Standard - 10.0:1 CR - 96"/103" Twin Cam Bored to 110 CI w/SE 95 cc Heads
KB Performance
$322.95Kb Performance - KB661C.STD - Piston Kit - 4.000" Standard - 10.0:1 CR - 96"/103" Twin Cam Bored to 110 CI w/SE 95 cc HeadsFeaturesOffset pin design for quiet operationEach kit contains two pistons,...$322.95 -
Kb Performance - KB661C.010 - Piston Kit - 4.000" +0.010" - 10.0:1 CR - 96"/103" Twin Cam Bored to 110 CI w/SE 95 cc Heads
KB Performance
$322.95Kb Performance - KB661C.010 - Piston Kit - 4.000" +0.010" - 10.0:1 CR - 96"/103" Twin Cam Bored to 110 CI w/SE 95 cc HeadsFeaturesOffset pin design for quiet operationEach kit contains two pistons,...$322.95 -
Out of stock
Kb Performance - KB661C.005 - Piston Kit - 4.000" +0.005" - 10.0:1 CR - 96"/103" Twin Cam Bored to 110 CI w/SE 95 cc Heads
KB Performance
$322.95Kb Performance - KB661C.005 - Piston Kit - 4.000" +0.005" - 10.0:1 CR - 96"/103" Twin Cam Bored to 110 CI w/SE 95 cc HeadsFeaturesOffset pin design for quiet operationEach kit contains two pistons,...$322.95 -
Out of stock
Kb Performance - KB305.040 - Piston Kit
KB Performance
$246.95Kb Performance - KB305.040 - Piston KitFeaturesManufactured from high-strength, T-5, heat-treated, 390 hypereutectic aluminum alloyAllow a tighter fit and longer piston and ring lifeDiamond-machined...$246.95 -
Kb Performance - KB660C.STD - Piston Kit - 3.875" Standard - 10.0:1 CR - 103" Twin Cam | 96" Big Bore to 103" w/SE 95 cc Heads
KB Performance
$322.95Kb Performance - KB660C.STD - Piston Kit - 3.875" Standard - 10.0:1 CR - 103" Twin Cam | 96" Big Bore to 103" w/SE 95 cc HeadsFeaturesOffset pin design for quiet operationEach kit contains two...$322.95 -
Out of stock
Kb Performance - KB348.010 - Piston Kit - 3.875" +0.010" - 9.3:1 CR - 95" Twin Cam Big Bore
KB Performance
$295.95Kb Performance - KB348.010 - Piston Kit - 3.875" +0.010" - 9.3:1 CR - 95" Twin Cam Big BoreFeaturesManufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum alloyAllows a tighter...$295.95 -
Out of stock
Kb Performance - KB258.STD - Piston Kit
KB Performance
$222.43Kb Performance - KB258.STD - Piston KitFeaturesManufactured from high-strength, T-5, heat-treated, 390 hypereutectic aluminum alloyAllow a tighter fit and longer piston and ring lifeDiamond-machined...$222.43 -
Out of stock
Kb Performance - KB258.040 - Piston Kit
KB Performance
$222.43Kb Performance - KB258.040 - Piston KitFeaturesManufactured from high-strength, T-5, heat-treated, 390 hypereutectic aluminum alloyAllow a tighter fit and longer piston and ring lifeDiamond-machined...$222.43 -
Kb Performance - KB258.030 - Piston Kit
KB Performance
$233.95Kb Performance - KB258.030 - Piston KitFeaturesManufactured from high-strength, T-5, heat-treated, 390 hypereutectic aluminum alloyAllow a tighter fit and longer piston and ring lifeDiamond-machined...$233.95 -
Kb Performance - KB907C.STD - Piston Kit - 3.875" Standard - 9.5:1 CR - 96" to 103" Big Bore |103" Twin Cam
KB Performance
$322.95Kb Performance - KB907C.STD - Piston Kit - 3.875" Standard - 9.5:1 CR - 96" to 103" Big Bore |103" Twin CamFeaturesOffset pin design for quiet operationEach kit contains two pistons, pins,...$322.95 -
Out of stock
Kb Performance - KB909C.STD - Piston Kit - 3.875" Standard -10.5:1 CR - 96" to 103" Big Bore |103" Twin Cam
KB Performance
$322.95Kb Performance - KB909C.STD - Piston Kit - 3.875" Standard -10.5:1 CR - 96" to 103" Big Bore |103" Twin CamFeaturesOffset pin design for quiet operationEach kit contains two pistons, pins,...$322.95 -
Kb Performance - KB906C.STD - Piston Kit - 3.875" Standard - 10.5:1 CR - Big Bore - 95" Twin Cam
KB Performance
$322.95Kb Performance - KB906C.STD - Piston Kit - 3.875" Standard - 10.5:1 CR - Big Bore - 95" Twin CamFeaturesOffset pin design for quiet operationEach kit contains two pistons, pins, spiral-lock pin clips...$322.95 -
Kb Performance - KB904C.STD - Piston Kit - 3.875" Standard - 9.25:1 CR - Big Bore - 95" Twin Cam
KB Performance
$322.95Kb Performance - KB904C.STD - Piston Kit - 3.875" Standard - 9.25:1 CR - Big Bore - 95" Twin CamFeaturesOffset pin design for quiet operationEach kit contains two pistons, pins, spiral-lock pin clips...$322.95 -
Out of stock
Kb Performance - KB922C.STD - Piston Kit - 3.498" Standard - 9.0:1 CR - Conversion to 1200 - XL883
KB Performance
$285.57Kb Performance - KB922C.STD - Piston Kit - 3.498" Standard - 9.0:1 CR - Conversion to 1200 - XL883FeaturesOffset pin design for quiet operationEach kit contains two pistons, pins, spiral-lock pin...$285.57 -
Kb Performance - KB409C.010 - Piston Kit - 3.875" +0.010" - 10.0:1 CR - 103" Twin Cam | 96" Twin Cam Big Bore
KB Performance
$236.95Kb Performance - KB409C.010 - Piston Kit - 3.875" +0.010" - 10.0:1 CR - 103" Twin Cam | 96" Twin Cam Big BoreFeaturesManufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum...$236.95 -
Kb Performance - KB409C.005 - Piston Kit - 3.875" +0.005" - 10.0:1 CR - 103" Twin Cam | 96" Twin Cam Big Bore
KB Performance
$236.95Kb Performance - KB409C.005 - Piston Kit - 3.875" +0.005" - 10.0:1 CR - 103" Twin Cam | 96" Twin Cam Big BoreFeaturesManufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum...$236.95 -
Kb Performance - PRJ100-4PK - Lock Ring - Twin Cam
KB Performance
$10.95Kb Performance - PRJ100-4PK - Lock Ring - Twin CamFeaturesReplacement piston lock rings for KB Performance Piston KitSpecsUnits4 PackRiding StyleStreetApplicationPistonTypeLock RingProduct NameWrist...$10.95 -
Out of stock
Kb Performance - KB596LCA.005 - Piston Kit - 4.250" +0.005" - 11.7:1 CR - 128" Big Bore - 114"/117" M8
KB Performance
$446.95Kb Performance - KB596LCA.005 - Piston Kit - 4.250" +0.005" - 11.7:1 CR - 128" Big Bore - 114"/117" M8FeaturesUpdates stock 107\Valve pockets are designed to accept up to +4.00 mm oversized intake...$446.95 -
Out of stock
Kb Performance - RRN-81-4PK - Wrist Pin Lock Ring
KB Performance
$10.95Kb Performance - RRN-81-4PK - Wrist Pin Lock RingFeaturesReplacement piston lock rings for KB Performance Piston KitSpecsProduct NameWrist PinRiding StyleStreetUnits4 PackApplicationPistonTypeLock...$10.95 -
Out of stock
Kb Performance - KB596LCA.STD - Piston Kit - 4.250" Standard - 11.7:1 CR - 128" Big Bore - 114"/117" M8
KB Performance
$446.95Kb Performance - KB596LCA.STD - Piston Kit - 4.250" Standard - 11.7:1 CR - 128" Big Bore - 114"/117" M8FeaturesUpdates stock 107\Valve pockets are designed to accept up to +4.00 mm oversized intake...$446.95 -
Out of stock
Kb Performance - KB409C.STD - Piston Kit - 3.875" Standard - 10.0:1 CR - 103" Twin Cam | 96" Twin Cam Big Bore
KB Performance
$236.95Kb Performance - KB409C.STD - Piston Kit - 3.875" Standard - 10.0:1 CR - 103" Twin Cam | 96" Twin Cam Big BoreFeaturesManufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum...$236.95
KB Performance – High-Compression Motorcycle Pistons for Twin Cam, Evolution, Sportster & Milwaukee-Eight Engines
KB Performance specializes in advanced forged and hypereutectic piston technology designed to meet the demands of modern Harley-Davidson engine builds. The brand’s extensive lineup of motorcycle piston kits covers popular configurations including Twin Cam big bore pistons, Evolution engine pistons, Sportster 883 to 1200 conversion pistons and Milwaukee-Eight big bore piston kits. Each design is carefully engineered to deliver balanced compression, controlled expansion and reliable ring seal for long-term engine durability.
Engine builders choose KB Performance pistons for their precise machining and application-specific compression ratios that support both stock and modified cylinder heads. From 95”, 103” and 110” Twin Cam builds to large-displacement M8 114”, 117”, 124” and 128” big bore conversions, KB piston kits help optimize combustion efficiency and throttle response. These pistons are well-suited for performance upgrades where strength, heat control and consistency are critical.
In addition to complete piston kits, KB Performance offers essential engine assembly components such as wrist pin lock rings and installation hardware to support accurate and repeatable engine assembly. Whether refreshing a stock engine or building a high-compression performance setup, KB Performance delivers motorcycle pistons that align with professional engine-building standards and proven real-world results.