Wiseco Black Edition Piston Kit - TC 103 CID 9:1 +.010 — 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, featuring Armor X and ArmorGlide coatings for durability and reduced friction. This kit includes premium compression and oil-control rings engineered to work with OEM and Screamin' Eagle cylinder heads.

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
• Armor X piston coating reduces wear
• ArmorGlide skirt coating reduces friction and improves scuff resistance
• Compatible with OEM and Screamin' Eagle heads

Specifications

• Brand: Wiseco
• Manufacturer Part #: K2789
• Engine Displacement: Twin Cam 103 CID
• Compression Ratio: 9:1
• Oversize: +.010
• Weight: 2.4 lbs

Fitment

Fits V-twin motorcycles with Twin Cam 103 CID engines running OEM or Screamin' Eagle cylinder heads.

Frequently Asked Questions

Will this piston kit work with stock Harley heads?

Yes — this kit is compatible with OEM Harley-Davidson and Screamin' Eagle heads for Twin Cam 103 engines.

What compression ratio does this provide?

9:1 compression ratio. Verify your cylinder head choice to ensure proper squish clearance and detonation margin.

Is the +.010 oversize a standard bore size?

Yes — the +.010 overbore is a common first-stage bore size for rebuilds. Confirm your cylinder bore before ordering to ensure proper fit.

What's included in the kit?

The Wiseco Black Edition piston with premium compression ring, Napier second ring, and 3mm oil ring — everything needed for one cylinder.