Wiseco Pistons K2789 Black Edition Piston Kit Bore Compression - 103ci 3.885in 9 1

The Wiseco K2789 Black Edition Piston Kit is a high-performance forged aluminum piston upgrade designed for Harley-Davidson Twin Cam engines. This kit converts 88ci, 96ci, or 103ci engines to 1700cc (103ci) displacement with a 3.885-inch bore and 9:1 compression ratio, delivering increased power and improved engine performance.

Key Features:

• ArmorX piston coating provides superior protection in extreme conditions and reduces wear
• ArmorFit skirt coating auto-adjusts to cylinder walls, eliminating clearance measurement needs and ensuring smooth, quiet operation
• ArmorPlating improves ring seal, eliminates ring micro-welding, and defends against detonation damage
• Reverse dome design optimizes flame travel to maximize air/fuel burn efficiency
• Superfinish chrome piston pins reduce friction and improve scuff resistance
• Enhanced pin oiling for improved lubrication and reduced friction
• High-tech manufacturing ensures greater operating strength and lower expansion at high temperatures

Complete Kit Includes:

• Two forged pistons (3.885-inch actual bore, .125-inch oversize)
• Piston ring sets
• Chrome piston pins
• Retainer clips
• Top-end gasket kit

Specifications:

• Displacement: 1700cc (103ci)
• Bore (Standard): 3.750 inches
• Bore (Actual): 3.885 inches
• Bore (Oversize): .125 inches
• Stroke: 4.375 inches
• Compression Ratio: 9:1
• Dome Type: Reverse
• Dome Volume: -11.5cc
• Valve Pocket Depth (Intake/Exhaust): -.205 inches
• Valve Pocket Diameter: 2.250 inches
• Material: Forged aluminum

Installation Notes: Cylinder boring is required for proper installation. Engine recalibration is recommended after installation. These pistons use VM-rings and can only be fitted with Wiseco VM-rings. Made in the USA.