Wiseco Black Edition Piston Kit - TC 103 CID 9:1 — Harley-Davidson Road King, Electra Glide Ultra Classic, Softail Heritage Classic (1999-2017)

Wiseco Black Edition piston kit for Twin Cam 103 CID engines at 9:1 compression ratio, engineered for stock and mildly modified heads. Features premium ring package with Armor X and ArmorGlide coatings to reduce wear, friction, and noise while maintaining OEM compatibility.

Features

• Premium compression ring for ultimate ring seal
• Napier second ring with taper face and underhook for improved oil control
• 3mm oil ring design with higher tension for enhanced oil control
• Armor X piston coating reduces wear
• ArmorGlide skirt coating reduces friction and improves scuff resistance
• Compatible with OEM and Screamin' Eagle cylinder heads

Specifications

• Brand: Wiseco
• Manufacturer Part #: K2788
• Engine Displacement: Twin Cam 103 CID
• Compression Ratio: 9:1
• Length: 9 in
• Width: 4 in
• Height: 4 in
• Weight: 2.4 lbs

Fitment

Fits V-twin motorcycles with Twin Cam 103 CID engines and compatible head casting.

Frequently Asked Questions

Will this piston work with my stock Harley cylinder head?

Yes — Wiseco designed this kit to work with OEM Harley cylinder heads and Screamin' Eagle performance heads.

What compression ratio does this give me?

This kit delivers 9:1 compression, suitable for stock and mildly modified engines running pump fuel.

Do I need to retune my ECM after installation?

Consult your tuner. A 9:1 compression ratio typically requires a fuel map adjustment for optimal performance.

What's the Armor X and ArmorGlide coating do?

Armor X reduces piston wear, while ArmorGlide on the skirt reduces friction and improves scuff resistance for quieter, longer-lasting operation.