Twin Power Advance Unit for Harley-Davidson Big Twin & XL 1970-1979

SKU: TWP215533
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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 Advance Unit for Vintage Harley-Davidson Motorcycles

Enhance the performance and reliability of your classic Harley-Davidson with the Twin Power Advance Unit. Designed as a direct replacement for Harley-Davidson part number 32517-70T, this unit is engineered to provide precise ignition timing for a smoother running engine and optimal power delivery.

Key Features and Benefits:

  • Direct Fit Replacement: Specifically designed to replace HD 32517-70T, ensuring a hassle-free installation on compatible models.
  • Wide Application: Fits a broad range of Harley-Davidson Big Twin models from 1970-1979 and XL models from 1971-1979.
  • Improved Performance: Ensures accurate ignition advance for better throttle response, improved fuel efficiency, and a more consistent idle.
  • Durable Construction: Built with quality materials to withstand the demands of V-twin engines, offering long-lasting service.
  • Restores Original Functionality: Replaces worn or faulty original advance units, bringing your ignition system back to its peak performance.

Vehicle Fitment:

This Twin Power Advance Unit is compatible with the following Harley-Davidson models:

  • Big Twin: 1970-1979 models
  • Sportster (XL): 1971-1979 models

Specifically fits models such as FX Super Glide, FXE Super Glide, FXS Low Rider, FXEF Fat Bob, XLCH, XLCR Cafe Racer, XLS Roadster, and XLT. Please verify your specific model and year for compatibility.

Ensure your vintage Harley-Davidson is running at its best with this essential ignition component. Get reliable performance and peace of mind with the Twin Power Advance Unit, available now at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1971-1978 Harley-Davidson FX Super Glide Base
1974-1979 Harley-Davidson FXE Super Glide Base
1979 Harley-Davidson FXEF Fat Bob Base
1977-1979 Harley-Davidson FXS Low Rider Base
1970-1979 Harley-Davidson XLCH Base
1978-1979 Harley-Davidson XLS Roadster Base
1977-1978 Harley-Davidson XLT 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 Advance Unit for Vintage Harley-Davidson Motorcycles

Enhance the performance and reliability of your classic Harley-Davidson with the Twin Power Advance Unit. Designed as a direct replacement for Harley-Davidson part number 32517-70T, this unit is engineered to provide precise ignition timing for a smoother running engine and optimal power delivery.

Key Features and Benefits:

  • Direct Fit Replacement: Specifically designed to replace HD 32517-70T, ensuring a hassle-free installation on compatible models.
  • Wide Application: Fits a broad range of Harley-Davidson Big Twin models from 1970-1979 and XL models from 1971-1979.
  • Improved Performance: Ensures accurate ignition advance for better throttle response, improved fuel efficiency, and a more consistent idle.
  • Durable Construction: Built with quality materials to withstand the demands of V-twin engines, offering long-lasting service.
  • Restores Original Functionality: Replaces worn or faulty original advance units, bringing your ignition system back to its peak performance.

Vehicle Fitment:

This Twin Power Advance Unit is compatible with the following Harley-Davidson models:

  • Big Twin: 1970-1979 models
  • Sportster (XL): 1971-1979 models

Specifically fits models such as FX Super Glide, FXE Super Glide, FXS Low Rider, FXEF Fat Bob, XLCH, XLCR Cafe Racer, XLS Roadster, and XLT. Please verify your specific model and year for compatibility.

Ensure your vintage Harley-Davidson is running at its best with this essential ignition component. Get reliable performance and peace of mind with the Twin Power Advance Unit, available now at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1971-1978 Harley-Davidson FX Super Glide Base
1974-1979 Harley-Davidson FXE Super Glide Base
1979 Harley-Davidson FXEF Fat Bob Base
1977-1979 Harley-Davidson FXS Low Rider Base
1970-1979 Harley-Davidson XLCH Base
1978-1979 Harley-Davidson XLS Roadster Base
1977-1978 Harley-Davidson XLT 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 Advance Unit for Vintage Harley-Davidson Motorcycles

Enhance the performance and reliability of your classic Harley-Davidson with the Twin Power Advance Unit. Designed as a direct replacement for Harley-Davidson part number 32517-70T, this unit is engineered to provide precise ignition timing for a smoother running engine and optimal power delivery.

Key Features and Benefits:

  • Direct Fit Replacement: Specifically designed to replace HD 32517-70T, ensuring a hassle-free installation on compatible models.
  • Wide Application: Fits a broad range of Harley-Davidson Big Twin models from 1970-1979 and XL models from 1971-1979.
  • Improved Performance: Ensures accurate ignition advance for better throttle response, improved fuel efficiency, and a more consistent idle.
  • Durable Construction: Built with quality materials to withstand the demands of V-twin engines, offering long-lasting service.
  • Restores Original Functionality: Replaces worn or faulty original advance units, bringing your ignition system back to its peak performance.

Vehicle Fitment:

This Twin Power Advance Unit is compatible with the following Harley-Davidson models:

  • Big Twin: 1970-1979 models
  • Sportster (XL): 1971-1979 models

Specifically fits models such as FX Super Glide, FXE Super Glide, FXS Low Rider, FXEF Fat Bob, XLCH, XLCR Cafe Racer, XLS Roadster, and XLT. Please verify your specific model and year for compatibility.

Ensure your vintage Harley-Davidson is running at its best with this essential ignition component. Get reliable performance and peace of mind with the Twin Power Advance Unit, available now at GGCRACING.

Vehicle Fitment

Years Make Model Trim
1971-1978 Harley-Davidson FX Super Glide Base
1974-1979 Harley-Davidson FXE Super Glide Base
1979 Harley-Davidson FXEF Fat Bob Base
1977-1979 Harley-Davidson FXS Low Rider Base
1970-1979 Harley-Davidson XLCH Base
1978-1979 Harley-Davidson XLS Roadster Base
1977-1978 Harley-Davidson XLT Base

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