Wiseco 40188PS 4-Stroke Forged Piston Kit 3.937 In Bore 10:1 CR 106CID Flat Top

The Wiseco 40188PS is a 4-Stroke Forged Series Piston Kit engineered for Harley-Davidson Twin Cam 96 engines, delivering a 3.937-inch bore, 10:1 compression ratio, and a flat-top design that expands displacement to 106 cubic inches. Manufactured in the USA, this kit is purpose-built for riders seeking a reliable performance upgrade over the stock TC96 configuration.

Key Features:

• Forged aluminum construction — forged from high-silicon, low-expansion aluminum for superior strength, reduced weight, improved heat transfer, and extended service life
• Flat-top piston design — optimized crown geometry for efficient combustion and detonation resistance
• 3.937 in. bore — increases displacement to 106 cubic inches from the stock 96ci
• 10:1 compression ratio — ideal for street-ridden V-Twin applications balancing power and pump-gas compatibility
• Complete kit — includes piston(s), wrist pin, rings, and circlips for a straightforward installation
• X-Series designation — precision CNC-machined to tight tolerances for consistent fit and performance
• Dyno-tested and validated by Wiseco's in-house R&D program
• Made in the USA

The Wiseco 40188PS is part of Wiseco's proven Forged Series lineup, backed by over 80 years of piston manufacturing expertise. This kit is the go-to choice for Twin Cam 96 big-bore builds requiring a durable, high-performance flat-top piston solution.