Wiseco Black Edition Piston Kit - M8 107cid 11.0:1 — Harley-Davidson Street Glide, Softail Fat Boy 114, Road King Special (2017-2026)

Wiseco Black Edition piston kit for Harley-Davidson M8 107cid engines at 11.0:1 compression, featuring Armor X and ArmorGlide coatings for durability and reduced friction. Purpose-built for stock and modified heads, these pistons are assembled and ready to install.

Features

• Premium compression ring for superior ring seal
• Napier second ring with taper face and underhook for oil control
• 3mm oil ring design for enhanced tension and control
• Armor X piston coating reduces wear
• ArmorGlide skirt coating for lower friction and quieter operation
• Compatible with OEM and Screamin' Eagle heads

Specifications

• Brand: Wiseco
• Manufacturer Part #: K2784
• Compression Ratio: 11.0:1
• Engine: M8 107cid
• Length: 9.5 in
• Width: 4.87 in
• Height: 4 in
• Weight: 2.77 lbs
• Country of Origin: United States of America

Fitment

Fits Harley-Davidson M8 107cid engines. Compatible with stock and Screamin' Eagle cylinder heads.

Frequently Asked Questions

Will these pistons work with my Screamin' Eagle heads?

Yes — Wiseco designed this kit to work with both OEM and Screamin' Eagle heads without modification.

What compression ratio do these provide?

11.0:1 compression. Confirm your cylinder head choice and gasket thickness to verify final compression in your build.

Do these come assembled and ready to install?

Yes. The piston kit arrives complete with rings, pins, and clips — ready for installation into your engine.

What's the benefit of Armor X and ArmorGlide coatings?

Armor X protects the piston crown and reduces wear. ArmorGlide on the skirt lowers friction, cuts noise, and improves scuff resistance during break-in and operation.

Are these pistons manufactured in the USA?

Yes — Wiseco manufactures these Black Edition pistons in the United States.