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Harley Big Twin 5 Speed Starter Jackshaft Pinion Gear 1989-1993 Evolution 9T OEM

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Harley Big Twin 5 Speed Starter Jackshaft Pinion Gear 1989-1993 Evolution 9T OEM photo 1 Harley Big Twin 5 Speed Starter Jackshaft Pinion Gear 1989-1993 Evolution 9T OEM photo 2 Harley Big Twin 5 Speed Starter Jackshaft Pinion Gear 1989-1993 Evolution 9T OEM photo 3 Harley Big Twin 5 Speed Starter Jackshaft Pinion Gear 1989-1993 Evolution 9T OEM photo 4 Harley Big Twin 5 Speed Starter Jackshaft Pinion Gear 1989-1993 Evolution 9T OEM photo 5

Description

Premium Factory Starting System Stock — Lifestyle Powersports Inventory Vault
Up for sale is a genuine, Harley-Davidson Factory OEM 5-Speed Big Twin Starter Drive Jackshaft and Pinion Assembly (Factory Reference Number: #31482-89). Removed carefully from a clean bike, these original primary starting components are preserved in excellent used garage condition. Unlike modern cheap, soft reproduction drivetrain components, this authentic factory assembly utilizes high-grade, heat-treated steel to prevent spline rounding or alignment binding during intense high-compression cold starting loops. [1]
Product Specifications & Mechanical Parameters:
  • Brand: Harley-Davidson (Original Equipment Manufacturer - OEM)
  • Component Type: Starter Motor Drive Extension Jackshaft and Bendix Pinion Assembly [1]
  • Pinion Gear Sizing: 9-Tooth (9T Profile engineered to mesh with standard 66T primary ring gears) 
  • OEM Factory Part Number: #31482-89 (Cross-references to aftermarket indices like Drag Specialties #79-2105) [1]
  • Platform Fitment Bounds: Direct factory drop-in replacement for internal starting assemblies across 1989 to 1993 Harley-Davidson Big Twin Evolution models:
    • 1989–1993 Softail (FXST / FLST / Fat Boy / Heritage / Springer)
    • 1989–1993 Touring (FLT / FLHT / Electra Glide / Road King / Tour Glide)
    • 1991–1993 Dyna Glide (FXDB / FXDC / FXDL / Sturgis / Daytona)
    • 1989–1993 FXR Series (Super Glide / Low Rider / Convertible)
  • Exclusions: Will NOT fit late-model 1994–2006 5-speed assemblies, which utilize a 10-tooth pinion gear configuration powered by a smaller 10-32 internal retention bolt pattern. 
  • Condition Details: Clean used garage stock. The 9 drive teeth on the pinion gear ring are sharp and uniform, free of flat spotting, mushroomed edges, or chipped valleys. The center extension spring holds excellent linear tension parameters, and the internal couplings slide smoothly with zero binding. Main tracking splines are square and clean. Staged in light storage oil to preserve against warehouse humidity.

Harley Big Twin 5 Speed Starter Jackshaft Pinion Gear 1989-1993 Evolution 9T OEM

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Premium Factory Starting System Stock — Lifestyle Powersports Inventory Vault Up for sale is a genuine, Harley-Davidson Factory OEM 5-Speed... Read more

1 in stock

$55.00

    • Shipped today? Order within: Jul 10, 2026 10:00:00 -0400

    Description

    Premium Factory Starting System Stock — Lifestyle Powersports Inventory Vault
    Up for sale is a genuine, Harley-Davidson Factory OEM 5-Speed Big Twin Starter Drive Jackshaft and Pinion Assembly (Factory Reference Number: #31482-89). Removed carefully from a clean bike, these original primary starting components are preserved in excellent used garage condition. Unlike modern cheap, soft reproduction drivetrain components, this authentic factory assembly utilizes high-grade, heat-treated steel to prevent spline rounding or alignment binding during intense high-compression cold starting loops. [1]
    Product Specifications & Mechanical Parameters:
    • Brand: Harley-Davidson (Original Equipment Manufacturer - OEM)
    • Component Type: Starter Motor Drive Extension Jackshaft and Bendix Pinion Assembly [1]
    • Pinion Gear Sizing: 9-Tooth (9T Profile engineered to mesh with standard 66T primary ring gears) 
    • OEM Factory Part Number: #31482-89 (Cross-references to aftermarket indices like Drag Specialties #79-2105) [1]
    • Platform Fitment Bounds: Direct factory drop-in replacement for internal starting assemblies across 1989 to 1993 Harley-Davidson Big Twin Evolution models:
      • 1989–1993 Softail (FXST / FLST / Fat Boy / Heritage / Springer)
      • 1989–1993 Touring (FLT / FLHT / Electra Glide / Road King / Tour Glide)
      • 1991–1993 Dyna Glide (FXDB / FXDC / FXDL / Sturgis / Daytona)
      • 1989–1993 FXR Series (Super Glide / Low Rider / Convertible)
    • Exclusions: Will NOT fit late-model 1994–2006 5-speed assemblies, which utilize a 10-tooth pinion gear configuration powered by a smaller 10-32 internal retention bolt pattern. 
    • Condition Details: Clean used garage stock. The 9 drive teeth on the pinion gear ring are sharp and uniform, free of flat spotting, mushroomed edges, or chipped valleys. The center extension spring holds excellent linear tension parameters, and the internal couplings slide smoothly with zero binding. Main tracking splines are square and clean. Staged in light storage oil to preserve against warehouse humidity.

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