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HOME » 128 Monster Big Bore Kit

Revolution Performance 128" Bolt-On Big Bore Kit

(Fits 2017-PRESENT 114" and 117" Milwaukee 8 Harley Davidson motorcycles)


The Revolution Performance 128" Milwaukee 8 Bolt-On Big Bore Kit is the most reliable way to increase power and torque on your 2017-2019 Milwaukee 8 114" & 117” engine. Each 128" kit comes with our state of the art all aluminum NSC plated cylinders which last longer and run cooler than the OEM cylinders. The cylinders are matched with a premium forged piston kit and a complete Cometic gasket kit.

    128" Bolt-On Big Bore Kit comes with:

  • NEW 4.250" all aluminum Nickel Silicon Carbide (NSC) plated cylinders available in: black-highlight, all black and black granite
  • Forged 11.3:1 compression ratio flat-top piston kit
  • Cometic head and base gasket kit
  • The 128" Bolt-On Big Bore Kit requires no other engine modifications to install but can benefit from our other products and services.

    Recommended Services:

  • 128" Milwaukee 8 Velocity CNC Cylinder Head Porting Package

For questions on our big bore kits, please contact our sales technicians directly at: 1-866-892-2109 M-F 8:30 A.M. - 5:00 P.M. CST.

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