Kb Pistons Hypereutectic Cast Piston - Pistons Tc88 TO 95ci 10.5:1 .005 — Harley-Davidson Road King, Road King Classic, Electra Glide (1999-2007)

KB Pistons Hypereutectic cast piston set for Twin Cam 88 to 95ci engines at 10.5:1 compression ratio. Built from 16% silicon hypereutectic alloy for tight piston-to-cylinder clearances, reduced wear, and quieter operation in air-cooled Harley engines running stock or mild boost on pump fuel.

Features

• 16% silicon hypereutectic alloy
• Low thermal expansion for tight ring seal
• Ideal for stock and mild compression ratios
• Reduced engine noise and wear
• Air-cooled engine optimized

Specifications

• Brand: KB Pistons
• Manufacturer Part #: KB411.005
• UPC: 800745152268
• Engine Application: Twin Cam 88 to 95ci
• Compression Ratio: 10.5:1
• Length: 9.5 in
• Width: 4.8 in
• Height: 4.6 in
• Weight: 3.1 lbs
• Country of Origin: Mexico

Fitment

Fits air-cooled Twin Cam 88 to 95ci engine builds running 10.5:1 compression or lower.

Frequently Asked Questions

What compression ratio are these pistons rated for?

10.5:1 and lower. They are not suitable for high-boost or nitrous applications exceeding this ratio.

Why hypereutectic instead of forged?

Hypereutectic alloy is ideal for air-cooled engines because the high silicon content reduces thermal expansion, allowing tighter piston-to-wall clearances and better ring seal without the noise of forged pistons.

Can I run these on pump fuel?

Yes — hypereutectic pistons at 10.5:1 compression are designed for stock gasoline without requiring high-octane fuel.

Are these pistons supplied as a complete set?

Verify the quantity with your order. Piston kits typically include all pistons, pins, and clips needed for a complete engine build.