Wiseco K1644 V-Twin Piston Kit 1340 Evo Big Twin +.040 Overbore 8.5:1 Compression

The Wiseco K1644 is a complete forged piston kit designed for the Harley-Davidson 80ci (1340cc) Evolution Big Twin engine. This kit is sized at +0.040" overbore with a 3.538" bore diameter, bringing displacement to 1369cc, and is built to a mild 8.5:1 compression ratio that makes it well-suited for street riding applications.

Kit Includes:

• 2x Wiseco 4722P4 forged pistons (front and rear)
• 2x Wiseco 3537X piston ring sets
• 2x Wiseco S534 wrist pins
• Circlips

Key Specifications:

• Engine Application: Harley-Davidson Evo Big Twin 1340 (80ci)
• Displacement: 1369cc
• Bore Size: 3.538" (+0.040" oversize)
• Stroke: 4.250"
• Compression Ratio: 8.5:1
• Piston Numbers: 4722P4 (x2)
• Ring Set: 3537X (x2)
• Wrist Pin: S534 (x2)

Wiseco Forged Piston Advantages:

• Forged from high-silicon, low-expansion aluminum alloy for superior strength, reduced weight, and improved heat transfer
• CNC diamond-turned finish ensures precise sizing with no variation, allowing confident installation in cast iron, chrome, Nikasil, and boron composite cylinder bores
• Oversize options like this +0.040" kit help extend the service life of cast iron lined cylinders; chrome, Nikasil, and boron composite cylinders can be re-sleeved to accept Wiseco oversizes
• Manufactured to exacting tolerances in Wiseco's state-of-the-art computerized production facility

Wiseco's K1644 piston kit is a trusted choice for rebuilding or refreshing a worn Evo Big Twin engine, providing OEM-quality fit with the durability benefits of a forged performance piston. Cross-reference part numbers: 4722P4, 3537X, S534.