Twin Power 17-Up M8 Black 4.25" Big Bore Cylinder Kit Pair

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SKU: TWP486959
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About TwinPower

TwinPower engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full TwinPower lineup with fast shipping and expert fitment support — order with confidence.

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Twin Power 17-Up M8 Black 4.25" Big Bore Cylinder Kit

Unleash the true potential of your Milwaukee-Eight (M8) engine with this high-performance Big Bore Cylinder Kit from Twin Power. Designed for 2017 and later M8 models, this kit increases displacement to a powerful 4.25 inches, delivering a significant boost in torque and horsepower. The cylinders feature a sleek, factory-style black textured powdercoat finish with highlighted fins, adding a custom look to your engine while maintaining a classic aesthetic.

Engineered for Performance and Durability:

  • Increased Displacement: Boosts engine performance with a 4.25" bore size for enhanced power output.
  • High-Quality Construction: Made from durable cast iron for strength and longevity.
  • Cast Iron Liners: Integrated liners provide excellent wear resistance and heat dissipation.
  • Ready to Run: Cylinders are finish-honed and ready for assembly, saving you time and effort.
  • Stylish Finish: Black textured powdercoat with highlighted fins for a custom, aggressive look.
  • Direct Fit for M8 Engines: Specifically designed for 2017 and newer Harley-Davidson M8 models.

This Twin Power Big Bore Cylinder Kit is the ideal upgrade for riders looking to significantly improve their motorcycle's performance without compromising reliability. The robust cast iron construction ensures these cylinders can handle the increased demands of a larger displacement engine. Installation is straightforward, as the cylinders are honed and ready to accept your pistons.

Transform your M8 motorcycle's riding experience with increased power and torque. Upgrade to the Twin Power 17-Up M8 Black 4.25" Big Bore Cylinder Kit for a noticeable performance gain. Explore this and other performance engine components at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2018-2020 Harley-Davidson FLDE Deluxe 107 Base
2018-2021 Harley-Davidson FLFBS Fat Boy 114 Base
2018-2021 Harley-Davidson FLHC Heritage Classic 107 Base
2018-2021 Harley-Davidson FLHCS Heritage Classic 114 Base
2017-2019 Harley-Davidson FLHRC Road King Classic Base
2017-2021 Harley-Davidson FLHRXS Road King Special Base
2017-2019 Harley-Davidson FLHTCU Electra Glide Ultra Classic Base
2017-2021 Harley-Davidson FLHTK Ultra Limited Base
2017-2021 Harley-Davidson FLHX Street Glide Base
2017-2021 Harley-Davidson FLHXS Street Glide Special Base
2018-2021 Harley-Davidson FLSB Sport Glide 107 Base
2018-2021 Harley-Davidson FLSL Softail Slim 107 Base
2017-2021 Harley-Davidson FLTRX Road Glide Base
2017-2021 Harley-Davidson FLTRXS Road Glide Special Base
2018-2020 Harley-Davidson FXBB Street Bob 107 Base
2018-2019 Harley-Davidson FXBR Breakout 107 Base
2018-2020 Harley-Davidson FXFB Fat Bob 107 Base
2018-2021 Harley-Davidson FXFBS Fat Bob 114 Base

Product Details

Product Description
Part Numbers
Sizing & Fit

About TwinPower

TwinPower engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full TwinPower lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Twin Power 17-Up M8 Black 4.25" Big Bore Cylinder Kit

Unleash the true potential of your Milwaukee-Eight (M8) engine with this high-performance Big Bore Cylinder Kit from Twin Power. Designed for 2017 and later M8 models, this kit increases displacement to a powerful 4.25 inches, delivering a significant boost in torque and horsepower. The cylinders feature a sleek, factory-style black textured powdercoat finish with highlighted fins, adding a custom look to your engine while maintaining a classic aesthetic.

Engineered for Performance and Durability:

  • Increased Displacement: Boosts engine performance with a 4.25" bore size for enhanced power output.
  • High-Quality Construction: Made from durable cast iron for strength and longevity.
  • Cast Iron Liners: Integrated liners provide excellent wear resistance and heat dissipation.
  • Ready to Run: Cylinders are finish-honed and ready for assembly, saving you time and effort.
  • Stylish Finish: Black textured powdercoat with highlighted fins for a custom, aggressive look.
  • Direct Fit for M8 Engines: Specifically designed for 2017 and newer Harley-Davidson M8 models.

This Twin Power Big Bore Cylinder Kit is the ideal upgrade for riders looking to significantly improve their motorcycle's performance without compromising reliability. The robust cast iron construction ensures these cylinders can handle the increased demands of a larger displacement engine. Installation is straightforward, as the cylinders are honed and ready to accept your pistons.

Transform your M8 motorcycle's riding experience with increased power and torque. Upgrade to the Twin Power 17-Up M8 Black 4.25" Big Bore Cylinder Kit for a noticeable performance gain. Explore this and other performance engine components at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2018-2020 Harley-Davidson FLDE Deluxe 107 Base
2018-2021 Harley-Davidson FLFBS Fat Boy 114 Base
2018-2021 Harley-Davidson FLHC Heritage Classic 107 Base
2018-2021 Harley-Davidson FLHCS Heritage Classic 114 Base
2017-2019 Harley-Davidson FLHRC Road King Classic Base
2017-2021 Harley-Davidson FLHRXS Road King Special Base
2017-2019 Harley-Davidson FLHTCU Electra Glide Ultra Classic Base
2017-2021 Harley-Davidson FLHTK Ultra Limited Base
2017-2021 Harley-Davidson FLHX Street Glide Base
2017-2021 Harley-Davidson FLHXS Street Glide Special Base
2018-2021 Harley-Davidson FLSB Sport Glide 107 Base
2018-2021 Harley-Davidson FLSL Softail Slim 107 Base
2017-2021 Harley-Davidson FLTRX Road Glide Base
2017-2021 Harley-Davidson FLTRXS Road Glide Special Base
2018-2020 Harley-Davidson FXBB Street Bob 107 Base
2018-2019 Harley-Davidson FXBR Breakout 107 Base
2018-2020 Harley-Davidson FXFB Fat Bob 107 Base
2018-2021 Harley-Davidson FXFBS Fat Bob 114 Base

Product Details

Product Description

About TwinPower

TwinPower engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full TwinPower lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Twin Power 17-Up M8 Black 4.25" Big Bore Cylinder Kit

Unleash the true potential of your Milwaukee-Eight (M8) engine with this high-performance Big Bore Cylinder Kit from Twin Power. Designed for 2017 and later M8 models, this kit increases displacement to a powerful 4.25 inches, delivering a significant boost in torque and horsepower. The cylinders feature a sleek, factory-style black textured powdercoat finish with highlighted fins, adding a custom look to your engine while maintaining a classic aesthetic.

Engineered for Performance and Durability:

  • Increased Displacement: Boosts engine performance with a 4.25" bore size for enhanced power output.
  • High-Quality Construction: Made from durable cast iron for strength and longevity.
  • Cast Iron Liners: Integrated liners provide excellent wear resistance and heat dissipation.
  • Ready to Run: Cylinders are finish-honed and ready for assembly, saving you time and effort.
  • Stylish Finish: Black textured powdercoat with highlighted fins for a custom, aggressive look.
  • Direct Fit for M8 Engines: Specifically designed for 2017 and newer Harley-Davidson M8 models.

This Twin Power Big Bore Cylinder Kit is the ideal upgrade for riders looking to significantly improve their motorcycle's performance without compromising reliability. The robust cast iron construction ensures these cylinders can handle the increased demands of a larger displacement engine. Installation is straightforward, as the cylinders are honed and ready to accept your pistons.

Transform your M8 motorcycle's riding experience with increased power and torque. Upgrade to the Twin Power 17-Up M8 Black 4.25" Big Bore Cylinder Kit for a noticeable performance gain. Explore this and other performance engine components at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2018-2020 Harley-Davidson FLDE Deluxe 107 Base
2018-2021 Harley-Davidson FLFBS Fat Boy 114 Base
2018-2021 Harley-Davidson FLHC Heritage Classic 107 Base
2018-2021 Harley-Davidson FLHCS Heritage Classic 114 Base
2017-2019 Harley-Davidson FLHRC Road King Classic Base
2017-2021 Harley-Davidson FLHRXS Road King Special Base
2017-2019 Harley-Davidson FLHTCU Electra Glide Ultra Classic Base
2017-2021 Harley-Davidson FLHTK Ultra Limited Base
2017-2021 Harley-Davidson FLHX Street Glide Base
2017-2021 Harley-Davidson FLHXS Street Glide Special Base
2018-2021 Harley-Davidson FLSB Sport Glide 107 Base
2018-2021 Harley-Davidson FLSL Softail Slim 107 Base
2017-2021 Harley-Davidson FLTRX Road Glide Base
2017-2021 Harley-Davidson FLTRXS Road Glide Special Base
2018-2020 Harley-Davidson FXBB Street Bob 107 Base
2018-2019 Harley-Davidson FXBR Breakout 107 Base
2018-2020 Harley-Davidson FXFB Fat Bob 107 Base
2018-2021 Harley-Davidson FXFBS Fat Bob 114 Base

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