Wiseco V-Twin Piston Kit - 1200 Sportster 10.5:1 Comp — Harley-Davidson Sportster 1200 Custom, Sportster 883, Sportster 883 Hugger (1972-2026)

Wiseco forged piston kit for Harley-Davidson 1200 Sportster with 10.5:1 compression ratio. Built from high-silicon aluminum for strength, heat transfer, and longevity across all cylinder bore types including cast iron, chrome, nikasil, and boron composite.

Features

• Forged high-silicon, low-expansion aluminum
• Diamond-turned finish from CNC machining
• Compatible with cast iron, chrome, nikasil, and boron composite bores
• Reduced weight and improved heat dissipation
• Oversize availability for resleeved cylinders

Specifications

• Brand: Wiseco
• Manufacturer Part #: K1746
• Compression Ratio: 10.5:1
• Weight: 3.3755 lbs
• Application: 1200 Sportster

Fitment

Fits Harley-Davidson 1200 Sportster. Wiseco pistons are compatible with all standard V-twin cylinder bore compositions.

Frequently Asked Questions

Will these pistons work in my chrome or nikasil-lined cylinders?

Yes — Wiseco pistons are engineered to install confidently in cast iron, chrome, nikasil, and boron composite bores.

Can I use oversize versions of this piston?

Yes — Wiseco offers oversize pistons if your cylinders have been bored or resleeved.

What's the compression ratio of this kit?

10.5:1 compression ratio, designed for stock and mildly modified 1200 Sportster builds.

Do I need to re-sleeve my cylinders to use these?

No — these pistons work directly in standard 1200 Sportster bore sizes. Resleeving is optional if you want to use oversize pistons.