Vtg NOS Harley 4-Speed 25T Transmission Sprocket 6-Spline PBI 278-25 Big Twin 88
Vtg NOS Harley 4-Speed 25T Transmission Sprocket 6-Spline PBI 278-25 Big Twin 88
Vtg NOS Harley 4-Speed 25T Transmission Sprocket 6-Spline PBI 278-25 Big Twin 88
Vtg NOS Harley 4-Speed 25T Transmission Sprocket 6-Spline PBI 278-25 Big Twin 88
Vtg NOS Harley 4-Speed 25T Transmission Sprocket 6-Spline PBI 278-25 Big Twin 88
Vtg NOS Harley 4-Speed 25T Transmission Sprocket 6-Spline PBI 278-25 Big Twin 88

Vtg NOS Harley 4-Speed 25T Transmission Sprocket 6-Spline PBI 278-25 Big Twin 88

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Vtg NOS Harley 4-Speed 25T Transmission Sprocket 6-Spline PBI 278-25 Big Twin 88

Part Details & Specifications
  • Brand: PBI Sprockets (Distributed by TR / NEMPCO)
  • Manufacturer Part Number (MPN): 278-25TH (Stamped "25T" and "PBI 278" on the metal face)
  • Distributor Reference Number: 88-9932
  • Tooth Count: 25 Teeth (Designed specifically for 530 pitch drive chains)
  • Drive Type: 6 Inner Splines (Standard flat configuration with no offset)
  • Mounting Holes: 3 evenly spaced holes surrounding the center hub for lockplate installation.
Primary Fitment Guide
As clearly labeled on the packaging header, this sprocket fits transitional 1980–1985 Harley-Davidson 4-Speed Big Twin models (late Shovelhead and early Evolution engines).
  • 35212-80
  • 33337-83  equivalent

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