Wiseco 4718P2 Forged Piston Kit Evo 883 to 1200cc Overbore 3.518in 9.5:1 Reverse Dome

The Wiseco 4718P2 is a forged piston kit designed to convert Harley-Davidson Sportster 883cc Evolution engines to 1200cc displacement. Featuring a reverse dome piston design, this kit delivers a 9.5:1 compression ratio with an actual bore size of 3.518 inches — up from the standard 3.000-inch bore. Note: 2008–2011 Harley-Davidson models require XL1200 cylinders for proper installation.

Kit Includes:

• 2x forged piston with ArmorGlide coated skirt
• 2x piston ring sets
• 2x chrome piston pins
• 2x round wire wrist pin locks / circlips

Forged High-Silicon Aluminum Construction

Every Wiseco piston is forged from high-silicon, low-expansion aluminum alloy, providing superior strength, reduced weight, improved heat transfer, and extended service life compared to cast alternatives. The dedicated forging process optimizes the strength-to-weight ratio for performance and durability.

Precision CNC Machining

Each piston receives a diamond-turned finish on CNC computer-controlled turning centers, ensuring a perfect fit with zero size variation. Wiseco pistons are compatible with all common cylinder bore compositions, including cast iron, chrome, Nikasil, and boron composite cylinders.

Oversize Compatibility

This kit is part of Wiseco's wide range of oversize pistons designed to extend the service life of cast iron lined cylinders. Chrome, Nikasil, and boron composite cylinders can be re-sleeved with replacement sleeves to accept Wiseco oversize pistons.

Engineered, forged, and machined in the USA at Wiseco's state-of-the-art facility in Mentor, Ohio, the 4718P2 is a proven choice for Sportster owners seeking a reliable and power-building 883-to-1200cc conversion. Corresponding full piston kit part number: K1657.