TECHLINE Harley-Davidson Motorcycle Transmissions

The function of the shifter shaft return spring (arrow) is to return the foot shifter to the center position between the upshift and downshift positions. This spring is the reason the shifter does not stay down after downshifting.

Part III: Shifter springs, shifter forks & other shifty things – by Donny Petersen This month in American Iron Harley magazine we continue with an excerpt from Chapter IX of Donny’s Unauthorized Technical Guide to Harley-Davidson 1936-Present, Volume III.  (Some content has been altered to fit AIM’s style and format.) The five-speed transmission shifter shaft […]

Harley Four-speed Transmissions

After the sprocket hold-down nut is torqued to H-D spec, the 10-24 screw is threaded into the most convenient of the three threaded holes in the sprocket to lock the nut in place and prevent it from loosening.

Locking setups, chain vs belt, and other comparisions – by Donny Petersen This month we have an excerpt From Chapter IX of Donny’s Unauthorized Technical Guide to Harley-Davidson 1936-Present, Volume III.  (Some content has been altered to fit American Iron Magazine’s style and format.) The locking methodology for the transmission sprocket or pulley evolved over […]