The new Harley Screamin’ Eagle hydraulic cam chain

H-D

The new Screamin’ Eagle hydraulic cam chain tensioner and high-flow oil pump upgrade kit (#25284-11/$499.95) from Harley-Davidson Genuine Motor Accessories updates the cam chain tensioner of a Twin Cam 88 engine to the latest hydraulic design features on Twin Cam 96 and 103 engines. The hydraulic cam chain tensioner is significantly more durable than the […]

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 […]

Zippers Muscle 103 Kit

These kits are available from any Zipper’s Performance Products dealer, or you can send your carefully packed heads and cylinders directly to Zipper’s. Give Your TC 96″ a Major Workout with Our Muscle 103″ Engine Package! Smooth, linear power is extracted from the Twin Cam® with the installation of Zipper’s Muscle 103″ engine kit. This […]