Kb Pistons Hypereutectic Cast Piston - Pistons Tc96 TO 103ci 10.0:1 STD — Harley-Davidson (2007-2017)

KB Pistons Hypereutectic cast piston for Twin Cam 96 to 103 cubic inch engines at 10.0:1 compression ratio. Cast with 16% silicon content for high thermal barrier properties and low expansion, enabling tight piston-to-cylinder clearances ideal for air-cooled Harley motors running pump fuel.

Features

• 16% silicon hypereutectic alloy
• Low thermal expansion rate
• Optimal ring seal and quiet operation
• Designed for stock and mild compression ratios to 10.5:1
• Standard bore size

Specifications

• Brand: KB Pistons
• Manufacturer Part #: KB409C.STD
• UPC: 800745151445
• Engine: Twin Cam 96-103 ci
• Compression Ratio: 10.0:1
• Bore Size: STD (standard)
• Length: 5.9 in
• Width: 5.8 in
• Height: 5.6 in
• Weight: 2.55 lbs
• Country of Origin: Mexico

Fitment

Fits air-cooled Twin Cam 96 to 103 cubic inch engines at 10.0:1 compression ratio running on pump fuel.

Frequently Asked Questions

Will these hypereutectic pistons work in my stock Twin Cam?

Yes. Hypereutectics are ideal for stock compression ratios and mild builds running 10.0:1 to 10.5:1 on pump fuel.

What's the advantage of hypereutectic pistons over forged?

Hypereutectic's high silicon content reduces thermal expansion, allowing tighter piston clearances for better ring seal, quieter running, and less wear in air-cooled engines.

Can I run these above 10.5:1 compression?

Not recommended. Hypereutectics are designed for stock and mild compression ratios up to 10.5:1. Higher compression requires forged pistons.

Do these need custom rings or standard rings?

The tight clearances require proper ring set selection — confirm ring compatibility with your engine builder or machine shop before assembly.