Wiseco K651M86 Forged Pistons for 2009-13 Hyundai / Genesis 2.0L G4KF / 4B11

Vehicle Fitment

• 2009-2013 Hyundai Genesis Coupe 2.0 L (G4KF / 4B11 Theta II)

Features

• Forged from 2618 aluminum for superior strength and fatigue resistance
• ArmorGlide® skirt coating reduces friction and prevents scuffing
• Dished crown (-4 cc) to manage compression under boost or high load
• Strutted forging structure improves piston rigidity
• Forced-pin oiling ensures reliable lubrication to the wrist pin area
• Precision ring grooves with anti-detonation features for better sealing
• High-performance ring set (8600XX) included
• Pro Tru Sport Compact design optimized for street and performance builds

Specifications

• Bore: 86.00 mm
• Stroke: 86.00 mm
• Compression Height: 30.00 mm
• Dome / Dish Volume: -4.0 cc
• Compression Ratio: ~9.3:1
• Wrist Pin Diameter: 22 mm
• Piston Weight: ≈ 356 g
• Recommended Ring Set: 8600XX

Included Components

• 4x Forged pistons
• 4x 22 mm wrist pins
• 4x Retaining clips
• 1x Ring set (8600XX)

Product Description

The Wiseco K651M86 piston kit is designed specifically for the 2.0 L Hyundai Theta II / 4B11 (G4KF) engines - commonly found in the Genesis Coupe. These forged pistons are made from high-grade 2618 aluminum, giving them outstanding strength, especially under demanding performance conditions. The ArmorGlide® coated skirts help reduce friction and improve longevity.

With a -4 cc dished crown and approximately 9.3:1 compression ratio, these pistons are well-suited for turbocharged or high-output naturally aspirated builds. The strutted forging increases stiffness, while forced-pin oiling ensures the wrist pin area remains well lubricated even at high RPM. Included in the kit is a high-quality 8600XX ring set to deliver reliable sealing and performance.

Installation requires verifying piston-to-wall clearance and deck height. This complete kit is a great upgrade for performance builders who want reliable, race-capable pistons for the Hyundai 2.0 L G4KF / 4B11 engine.