Twin Power Primary Case to Engine Gasket — Fits 2017-Up Harley-Davidson M8

SKU: TWP043354
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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.

Watch in action

Essential Primary Case to Engine Gasket for M8 Engines

Ensure a secure and leak-free connection between your primary case and engine with this high-quality gasket from Twin Power. Specifically designed for 2017 and newer Harley-Davidson Milwaukee-Eight (M8) models, this gasket is a direct replacement for Harley-Davidson part number 257000455.

Key Features & Benefits:

  • Perfect Fitment: Engineered for 2017-up Harley-Davidson M8 engines, ensuring a precise seal.
  • OEM Replacement: Directly replaces Harley-Davidson part number 257000455.
  • Durable Construction: Made from robust materials designed to withstand the demanding environment of the primary drive system.
  • Leak Prevention: Guarantees a tight seal to prevent primary fluid leaks and maintain optimal lubrication.
  • Engine Protection: Protects critical engine components by maintaining the integrity of the primary housing.

Why This Gasket Matters:

The primary drive system is vital for your motorcycle's operation, housing the clutch and transmission components. A proper seal on the primary case is crucial to prevent fluid loss and contamination. This Twin Power gasket ensures that your primary fluid stays where it belongs, lubricating and protecting the gears and clutch pack, contributing to a smooth and reliable ride. Whether you're performing routine maintenance, replacing the primary chain, or servicing the clutch, this gasket is a necessary component.

Vehicle Fitment:

This gasket is compatible with the following Harley-Davidson M8 models:

  • Milwaukee-Eight (M8) Models (2017-Up): Including Road King, Street Glide, Road Glide, Softail models (Fat Boy, Heritage Classic, etc.), and Trike models.

Always verify fitment for your specific motorcycle year and model. Trust Twin Power for reliable components. Get your M8 Primary Case to Engine Gasket today at GGCRACING!

Vehicle Fitment

Years Make Model Trim
2018-2021 Harley-Davidson FLHC Heritage Classic 107 Base
2018-2021 Harley-Davidson FLHCS Heritage Classic 114 Base
2017-2021 Harley-Davidson FLHR Road King Base
2017-2019 Harley-Davidson FLHRC Road King Classic Base
2017-2019 Harley-Davidson FLHTCU Electra Glide Ultra Classic Base
2017-2021 Harley-Davidson FLHTK Ultra Limited Base
2017-2020 Harley-Davidson FLHTKL Ultra Limited Low Base
2017-2021 Harley-Davidson FLHX Street Glide Base
2017-2020 Harley-Davidson FLTRU Road Glide Ultra Base
2017-2021 Harley-Davidson FLTRXS Road Glide Special 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

Essential Primary Case to Engine Gasket for M8 Engines

Ensure a secure and leak-free connection between your primary case and engine with this high-quality gasket from Twin Power. Specifically designed for 2017 and newer Harley-Davidson Milwaukee-Eight (M8) models, this gasket is a direct replacement for Harley-Davidson part number 257000455.

Key Features & Benefits:

  • Perfect Fitment: Engineered for 2017-up Harley-Davidson M8 engines, ensuring a precise seal.
  • OEM Replacement: Directly replaces Harley-Davidson part number 257000455.
  • Durable Construction: Made from robust materials designed to withstand the demanding environment of the primary drive system.
  • Leak Prevention: Guarantees a tight seal to prevent primary fluid leaks and maintain optimal lubrication.
  • Engine Protection: Protects critical engine components by maintaining the integrity of the primary housing.

Why This Gasket Matters:

The primary drive system is vital for your motorcycle's operation, housing the clutch and transmission components. A proper seal on the primary case is crucial to prevent fluid loss and contamination. This Twin Power gasket ensures that your primary fluid stays where it belongs, lubricating and protecting the gears and clutch pack, contributing to a smooth and reliable ride. Whether you're performing routine maintenance, replacing the primary chain, or servicing the clutch, this gasket is a necessary component.

Vehicle Fitment:

This gasket is compatible with the following Harley-Davidson M8 models:

  • Milwaukee-Eight (M8) Models (2017-Up): Including Road King, Street Glide, Road Glide, Softail models (Fat Boy, Heritage Classic, etc.), and Trike models.

Always verify fitment for your specific motorcycle year and model. Trust Twin Power for reliable components. Get your M8 Primary Case to Engine Gasket today at GGCRACING!

Vehicle Fitment

Years Make Model Trim
2018-2021 Harley-Davidson FLHC Heritage Classic 107 Base
2018-2021 Harley-Davidson FLHCS Heritage Classic 114 Base
2017-2021 Harley-Davidson FLHR Road King Base
2017-2019 Harley-Davidson FLHRC Road King Classic Base
2017-2019 Harley-Davidson FLHTCU Electra Glide Ultra Classic Base
2017-2021 Harley-Davidson FLHTK Ultra Limited Base
2017-2020 Harley-Davidson FLHTKL Ultra Limited Low Base
2017-2021 Harley-Davidson FLHX Street Glide Base
2017-2020 Harley-Davidson FLTRU Road Glide Ultra Base
2017-2021 Harley-Davidson FLTRXS Road Glide Special 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

Essential Primary Case to Engine Gasket for M8 Engines

Ensure a secure and leak-free connection between your primary case and engine with this high-quality gasket from Twin Power. Specifically designed for 2017 and newer Harley-Davidson Milwaukee-Eight (M8) models, this gasket is a direct replacement for Harley-Davidson part number 257000455.

Key Features & Benefits:

  • Perfect Fitment: Engineered for 2017-up Harley-Davidson M8 engines, ensuring a precise seal.
  • OEM Replacement: Directly replaces Harley-Davidson part number 257000455.
  • Durable Construction: Made from robust materials designed to withstand the demanding environment of the primary drive system.
  • Leak Prevention: Guarantees a tight seal to prevent primary fluid leaks and maintain optimal lubrication.
  • Engine Protection: Protects critical engine components by maintaining the integrity of the primary housing.

Why This Gasket Matters:

The primary drive system is vital for your motorcycle's operation, housing the clutch and transmission components. A proper seal on the primary case is crucial to prevent fluid loss and contamination. This Twin Power gasket ensures that your primary fluid stays where it belongs, lubricating and protecting the gears and clutch pack, contributing to a smooth and reliable ride. Whether you're performing routine maintenance, replacing the primary chain, or servicing the clutch, this gasket is a necessary component.

Vehicle Fitment:

This gasket is compatible with the following Harley-Davidson M8 models:

  • Milwaukee-Eight (M8) Models (2017-Up): Including Road King, Street Glide, Road Glide, Softail models (Fat Boy, Heritage Classic, etc.), and Trike models.

Always verify fitment for your specific motorcycle year and model. Trust Twin Power for reliable components. Get your M8 Primary Case to Engine Gasket today at GGCRACING!

Vehicle Fitment

Years Make Model Trim
2018-2021 Harley-Davidson FLHC Heritage Classic 107 Base
2018-2021 Harley-Davidson FLHCS Heritage Classic 114 Base
2017-2021 Harley-Davidson FLHR Road King Base
2017-2019 Harley-Davidson FLHRC Road King Classic Base
2017-2019 Harley-Davidson FLHTCU Electra Glide Ultra Classic Base
2017-2021 Harley-Davidson FLHTK Ultra Limited Base
2017-2020 Harley-Davidson FLHTKL Ultra Limited Low Base
2017-2021 Harley-Davidson FLHX Street Glide Base
2017-2020 Harley-Davidson FLTRU Road Glide Ultra Base
2017-2021 Harley-Davidson FLTRXS Road Glide Special Base

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