S&S Cycle 910-0685A Big Bore Cylinder Kit Wrinkle Black - 128 M8

The S&S Cycle 910-0685A is a 128 cubic inch big bore cylinder kit designed for Harley-Davidson Milwaukee-Eight 114" and 117" engines. This performance upgrade delivers impressive power gains while maintaining compatibility with stock cylinder heads, making it an ideal choice for riders seeking substantial displacement increases without extensive engine modifications.

Key Features:

• 4.250" bore diameter with updated cylinder profile
• 4.840" deck height for optimal compression
• Wrinkle black finish without highlighted fins
• Bolt-on installation - no case boring or splitting required
• Premium aluminum castings with cast-in iron liners
• Stock bolt pattern for direct fitment
• Works with stock crankcases and cylinder heads
• Made in the USA

Complete Kit Includes:

• Cylinders with iron liners
• High-quality forged pistons
• Piston rings and wrist pins
• Head gaskets
• Base gaskets
• Exhaust gaskets
• All necessary hardware for installation

This kit transforms your 114" or 117" M8 engine into a powerful 128 cubic inch powerplant. The easy installation process simply requires swapping cylinders without complex machining work. Professional installation by a skilled technician is recommended to ensure proper clearances and assembly specifications. Note: Not recommended for FL Trike applications. This product is not legal for sale or use in California on pollution-controlled motor vehicles.