S&S Cycle 910-0025 4-1/8" Bore Cylinder and Piston Kit Wrinkle Black

The S&S Cycle 910-0025 is a high-performance 4-1/8" bore cylinder and piston kit designed for Harley-Davidson Twin Cam engines. This premium big bore kit features a durable wrinkle black powder coat finish and is engineered as a component for S&S 124" Hot Set Up conversions.

Key Features:

• 4-1/8" (4.125") bore cylinders with stock bolt pattern
• Forged pistons designed for 4-5/8" stroke flywheels
• Wrinkle black powder coat finish with machined edges
• Premium aluminum castings with cast-in iron liners
• Includes cylinders, pistons, rings, wrist pins, and gaskets (head, base, and exhaust)
• Compatible with 124" displacement builds when used with proper stroke
• Made in the U.S.A.

Important Installation Notes:

• Crankcases must be bored to accept the larger 4-1/8" bore cylinders
• Designed for use with S&S Super Stock cylinder heads or stock heads depending on piston configuration
• Professional installation by a skilled technician is required
• Installer must verify all clearances and assembly specifications
• Performance air cleaner, exhaust system, and fuel system tuning recommended for optimal results

This cylinder and piston kit is a core component for builders seeking to transform their stock Harley-Davidson Twin Cam engine into a high-performance 124" powerplant. The wrinkle black finish provides a distinctive, professional appearance while the forged pistons and quality construction ensure reliability and durability.