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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.
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.
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.
| 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 |
Other popular TwinPower products customers consider together:
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.
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.
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.
| 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 |
Other popular TwinPower products customers consider together: