Kb Pistons Hypereutectic Cast Piston - Pistons Tc88 TO 95ci 9.3:1 STD — Harley-Davidson Road King, Road King Classic, Electra Glide (1999-2007)

KB Pistons Hypereutectic cast pistons for Twin Cam 88 to 95ci air-cooled engines at stock bore. Cast with 16% silicon content for low thermal expansion and tight piston-to-wall clearances, delivering quieter operation and reduced wear in stock or mild compression ratios up to 10.5:1.

Features

• 16% silicon hypereutectic alloy
• Low thermal expansion rate
• Tight piston-to-cylinder clearances
• Suitable for stock to mild compression up to 10.5:1
• Air-cooled engine optimization

Specifications

• Brand: KB Pistons
• Manufacturer Part #: KB348.STD
• UPC: 800745068392
• Engine Family: Twin Cam 88 to 95ci
• Bore: Standard
• Compression Ratio: 9.3:1
• Length: 9.6 in
• Width: 4.8 in
• Height: 4.6 in
• Weight: 3 lbs
• Country of Origin: Mexico

Fitment

Fits air-cooled Twin Cam 88 to 95ci engines at standard bore.

Frequently Asked Questions

What compression ratio are these pistons rated for?

These hypereutectic pistons are best suited for stock or mild compression ratios up to 10.5:1 running on pump fuel.

Will these work in my big-bore 98ci or 103ci engine?

No — these pistons are sized for Twin Cam 88 to 95ci displacement at standard bore. Larger displacements require different piston sizes.

Why hypereutectic over forged pistons?

Hypereutectic alloy's low thermal expansion allows tighter clearances in air-cooled engines, reducing noise and wear while costing less than forged options.

Do I need to re-ring my engine?

Yes — new piston kits typically include rings and wrist pins. Consult the KB instructions or your engine builder for proper ring end-gap setup.

Can I run higher compression with these pistons?

Not recommended above 10.5:1 on pump fuel. For high-compression builds, KB offers forged piston alternatives.