Wiseco Black Edition Piston Kit - TC 103 CID 9.6:1 +.010 — Harley-Davidson (1999-2017)

Wiseco Black Edition piston kit for Twin Cam 103 CID engines with 9.6:1 compression ratio and +.010 oversized bore. Forged aluminum construction with premium ring package and dual thermal coatings for durability, oil control, and reduced friction on high-performance V-twin builds.

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 for reduced friction and improved scuff resistance
• Compatible with OEM and Screamin' Eagle cylinder heads

Specifications

• Brand: Wiseco
• Manufacturer Part #: K2791
• Engine Size: Twin Cam 103 CID
• Compression Ratio: 9.6:1
• Bore Size: +.010 oversized
• Length: 9 in
• Width: 4 in
• Height: 4 in
• Weight: 2.4 lbs

Fitment

Fits Harley-Davidson Twin Cam 103 CID engines with +.010 oversized bore requirement.

Frequently Asked Questions

What compression ratio does this piston give me?

9.6:1 compression. This is a higher compression ratio suitable for performance builds and tuned fuel mapping.

Will this work with my stock Harley or Indian heads?

Yes — compatible with OEM cylinder heads and Screamin' Eagle performance heads.

Do I need to have my cylinders bored for this kit?

Yes. This is a +.010 oversized piston, so your cylinders must be bored .010 inches oversize by a qualified machine shop.

What coatings are on the piston and rings?

The piston uses Armor X coating on the crown and ArmorGlide skirt coating to reduce wear and friction. The ring package includes premium compression and Napier second ring for superior seal and oil control.

Can I use this kit with stock intake and exhaust?

Piston compression and coatings work with stock fuel systems. For best performance, fuel mapping or a tuner is recommended with 9.6:1 compression.