S&S Cycle 920-0150 129ci Big Bore Cylinder Kit for Harley M8

The S&S Cycle 920-0150 is a premium 129 cubic inch big bore cylinder kit engineered for 2017 and later Harley-Davidson M8 (Milwaukee-Eight) engines. This high-performance kit features an updated profile design with a stock bolt pattern for straightforward installation, making it an ideal upgrade for riders seeking significant displacement gains without major engine modifications.

Key Specifications:

• Displacement: 129 cubic inches (2,114cc)
• Bore: 4.320 inches (109.7mm)
• Stroke: 4.375 inches
• Bore Spacing: 4.840 inches
• Bolt Pattern: Stock configuration for easy installation
• Finish: Wrinkle Black with machined highlights
• Liner: Durable ductile iron construction
• S&S logo cast into cylinders

Features and Benefits:

• Updated profile design optimizes combustion efficiency and cooling
• Ductile iron liner provides excellent wear resistance and longevity
• Stock bolt pattern eliminates the need for case modifications
• Premium wrinkle black finish with machined highlights for a show-quality appearance
• Engineered and manufactured in the USA by S&S Cycle
• Direct upgrade path for Milwaukee-Eight engines

This complete cylinder kit provides everything needed to increase your M8 engine displacement to 129 cubic inches, delivering substantial torque and horsepower gains while maintaining reliability. The stock bolt pattern design simplifies the upgrade process, making this an excellent choice for both professional builders and experienced DIY mechanics.