Twin Power 17-Up M8 Touring Primary Gasket - Replaces H-D 25700378

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SKU: TWP043344
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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.

Twin Power 2017-Up M8 Touring Models Primary Gasket

Maintain the integrity of your Harley-Davidson's powertrain with this high-quality Primary Gasket from Twin Power, designed specifically for 2017 and later Milwaukee-Eight (M8) Touring models. This essential gasket replaces the Harley-Davidson OEM part number 25700378, ensuring a precise fit and reliable sealing for your primary drive system. Whether you're performing routine maintenance, servicing the clutch, or addressing a leak, this gasket is crucial for preventing fluid loss and maintaining optimal performance.

Product Features:

  • Application Specific: Designed for 2017 and newer Harley-Davidson M8 Touring motorcycles.
  • OEM Replacement: Directly replaces Harley-Davidson part number 25700378.
  • Durable Construction: Made from high-quality materials engineered to withstand the demanding environment of the primary drive.
  • Secure Sealing: Ensures a tight seal to prevent oil leaks and maintain proper lubrication within the primary.
  • Reliability: Twin Power is known for providing dependable aftermarket parts for Harley-Davidson motorcycles.

The primary drive system is a critical part of your motorcycle's operation, and a compromised gasket can lead to significant issues. This Twin Power primary gasket provides the reliability and performance you need to keep your M8 Touring bike running smoothly. It's the perfect component for any mechanic or rider performing work on the primary cover, transmission, or related components. Ensure your Harley-Davidson M8 is properly sealed and protected with quality parts from Twin Power. Purchase yours today!

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.

Twin Power 2017-Up M8 Touring Models Primary Gasket

Maintain the integrity of your Harley-Davidson's powertrain with this high-quality Primary Gasket from Twin Power, designed specifically for 2017 and later Milwaukee-Eight (M8) Touring models. This essential gasket replaces the Harley-Davidson OEM part number 25700378, ensuring a precise fit and reliable sealing for your primary drive system. Whether you're performing routine maintenance, servicing the clutch, or addressing a leak, this gasket is crucial for preventing fluid loss and maintaining optimal performance.

Product Features:

  • Application Specific: Designed for 2017 and newer Harley-Davidson M8 Touring motorcycles.
  • OEM Replacement: Directly replaces Harley-Davidson part number 25700378.
  • Durable Construction: Made from high-quality materials engineered to withstand the demanding environment of the primary drive.
  • Secure Sealing: Ensures a tight seal to prevent oil leaks and maintain proper lubrication within the primary.
  • Reliability: Twin Power is known for providing dependable aftermarket parts for Harley-Davidson motorcycles.

The primary drive system is a critical part of your motorcycle's operation, and a compromised gasket can lead to significant issues. This Twin Power primary gasket provides the reliability and performance you need to keep your M8 Touring bike running smoothly. It's the perfect component for any mechanic or rider performing work on the primary cover, transmission, or related components. Ensure your Harley-Davidson M8 is properly sealed and protected with quality parts from Twin Power. Purchase yours today!

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.

Twin Power 2017-Up M8 Touring Models Primary Gasket

Maintain the integrity of your Harley-Davidson's powertrain with this high-quality Primary Gasket from Twin Power, designed specifically for 2017 and later Milwaukee-Eight (M8) Touring models. This essential gasket replaces the Harley-Davidson OEM part number 25700378, ensuring a precise fit and reliable sealing for your primary drive system. Whether you're performing routine maintenance, servicing the clutch, or addressing a leak, this gasket is crucial for preventing fluid loss and maintaining optimal performance.

Product Features:

  • Application Specific: Designed for 2017 and newer Harley-Davidson M8 Touring motorcycles.
  • OEM Replacement: Directly replaces Harley-Davidson part number 25700378.
  • Durable Construction: Made from high-quality materials engineered to withstand the demanding environment of the primary drive.
  • Secure Sealing: Ensures a tight seal to prevent oil leaks and maintain proper lubrication within the primary.
  • Reliability: Twin Power is known for providing dependable aftermarket parts for Harley-Davidson motorcycles.

The primary drive system is a critical part of your motorcycle's operation, and a compromised gasket can lead to significant issues. This Twin Power primary gasket provides the reliability and performance you need to keep your M8 Touring bike running smoothly. It's the perfect component for any mechanic or rider performing work on the primary cover, transmission, or related components. Ensure your Harley-Davidson M8 is properly sealed and protected with quality parts from Twin Power. Purchase yours today!

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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