M8 Harley engine, 31 Tooth Transmission Pulley and companion kits, 2017-2025. Does not fit Sportster.


Front Pulley Only Information:
  • Pulley: Hardened Steel, 31TS-4HD, 2017-2020
  • Possible increase Gas Mileage
  • Increase RPM in Each Gear, ~3%
  • Increase Engine RPM's: Cruise comfortably at 70 mph
  • Install: Does not require a belt change
  • Speedometer: This pulley will make speedometers read faster than actual road speed.
  • Fitment: All models with M8, use existing belt. No modifications required.
  • Guaranty: 30 day warranty
  • Sales Tax: May be added at check out
Companion Items: 
  • Pulley Tools: Front pulley holder and socket
  • Speedometer Corrector: Corrects the speedometer for the pulley change. The Gear Indicator may stop working.

Speedometer Corrector
  • Pulley & Corrector Kit: 
  • Speedometer Corrector: Re-calibrates electronic speedometer & odometer for changes made to pulleys and tire size. The Corrector fixes Speedometer but stops Gear Indicator from working. 
  • Install: The Corrector simply plugs into your existing wire harness; no cutting or splicing wires!
  • Adjustment: The Corrector may be changed at any time without tools or computer!
Tools
  • Pulley & Tools Kit:
  • Socket: 2-1/4" x 1/2" drive! Includes thread protector!
  • Holder: Keeps the pulley from turning. All impact wrench torque goes to the nut, NOT YOUR BELT, TRANS & PRIMARY CHAIN ADJUSTER! 
Visit my store!
Front Fork Socket: A 1/2" drive x 1-3/8" socket that won't damage your nut or the chrome! (SOC138-HD)
LED Tail Lamps:  Dyna, Softail, Glide, enhance your existing Turn Signals and Tail Light to LED's!