Flat Top Piston Kit (KB409C.010) by KB Performance Motorcycle®. Hypereutectic Alloy is a cast 16% high silicon content material that has very high thermal barrier properties along with a low thermal expansion rate. This alloy is perfectly suited for an air-cooled engine. Tight piston-tocylinder clearances are used to achieve better ring seal and a quiet running engine. Hypereutectics are best suited for Street Bikes using stock or mild compression ratios to 10.5:1 running on pump fuel. With the high silicon content, these pistons will resist skirt wear the best. Models that end in a "C" come with Anti-Friction skirt coating.
Notes
Piston has an anti-friction skirt coating.
Specifications
Alloy: 390
Bore Standard: 3.875"
Bore Standard: 98.4 mm
Comp. Ht.: 1.086"
Compression Ratio: 10.0:1 with 85cc
Crown: +1.9cc
Crown Type: Flat Top
Engine Disp Liters: 1688
Engine Disp: 103"
Exhaust Valve Depth/Diameter: 0.194-2.126
Intake Valve Depth/Diameter: 0.194-2.126
Lock: PRJ100-3
Oe Deck Height: 6.000
Pin Diameter: 0.927"
Pin Diameter: 23.5 mm
Pin No: 0927x300K
Pin Type: Floating
Ring Set #: 2M4941
Ring Sizes: 2-1.5mm,1-2.5mm
Rod: 7.667"
Rod: 195 mm
Stroke: 4.375"
Stroke: 111.1 mm
Top Land: 0.141
Weight: 371/102
Bore: 3.885"
Piston Material: Hypereutectic aluminum
Wrist Pin Style: Floating
Top Ring Material: Cast iron
Top Ring Facing Material: Cast iron
Second Ring Material: Cast iron
Second Ring Facing Material: Cast iron
Oil Ring Material: Stainless steel
Gaskets Included: No
Connecting Rods Included: No
Quantity: Sold as a kit
Features
Expertly crafted from the highest grade materials
Built for long-lasting dependability and unmatched quality
Made with great care and extreme attention to detail
KB Performance® has carved out a niche for itself in the motorcycle industry by offering state-of-the-art high-performance pistons for Harley-Davidson and Indian bikes. Ideal for racing junkies, die-hard motocross riders and speed adrenaline fans, competition-grade KB Performance pistons are built with premium, high-strength Hypereutectic 390 alloy and Forged 4032 low expansion alloy to give you rock-solid durability and hardcore performance under the vigorous conditions of high revving speed conditions. KB Performance piston lineup goes the extra mile when it comes to incomparable reliability and terrific value. Advanced V-Twin performance piston technology married with the latest manufacturing techniques and rigorous quality standards put KB Performance products head and shoulders above the rest. They feature offset wrist pins to make your hog’s inner beast quieter and most pistons have coated skirts. KB Performance Low expansion alloy pistons will come in handy if you want a tighter piston to wall running clearance. With dependable KB Performance pistons, you can dress up your high performance beast to leave the competition in the dust!
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KB Performance Motorcycle® KB409C.010 - Flat Top Piston Kit
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