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Category dedicated to S&S 4.25-inch (69 ci) big bore kits designed specifically for Harley-Davidson Milwaukee Eight engines. These cylinder and piston sets increase engine capacity, improving torque and throttle response. Includes cylinders, pistons, piston rings, and necessary gaskets for installation.
These 4 1/4" (107.95mm) bore kits are easy to install as no crankcase machining is required. The kits include…
These 4 1/4" (107.95mm) bore kits are easy to install as no crankcase machining is required. The kits include…
These 4 1/4" (107.95mm) bore kits are easy to install as no crankcase machining is required. The kits include…
These 4 1/4" (107.95mm) bore kits are easy to install as no crankcase machining is required. The kits include…
Compatible with Touring, Softail, Dyna, and Sportster families fitted with the Milwaukee Eight engine, from its introduction in 2017. Ideal for those seeking a significant power increase while maintaining the engine’s original reliability. Typical references such as S&S 474C or 585G within this range. Essential spares for customisation and performance enhancement projects on modern American motorcycles.