Upgrading Harley’s 39mm Front End, Pt 2

More Forking Around

Upgrading Harley’s 39mm Front End

Upgrading Harley’s 39mm Front End, Pt 2

  1. Using the two aforementioned 7/8-inch wrenches, tighten the nut on the tool and you will notice the bearing races sinking into the frame. Tighten the nut until it stops.

Words and Photos: Jeff Leighton

Upgrading Harley’s 39mm Front End

Upgrading Harley’s 39mm Front End, Pt 2

  1. We will be using two OEM H-D bearings (part No. 48300-60). This kit comes with bearing and races. Since we have installed the races properly, we can move on to packing the bearings with grease. To do this we will be using a K&L bearing packer.

Words and Photos: Jeff Leighton

Upgrading Harley’s 39mm Front End

Upgrading Harley’s 39mm Front End, Pt 2

  1. After taking the bearings out of the packer put grease all over the rest of bearing surfaces to ensure total coverage.

Words and Photos: Jeff Leighton

Upgrading Harley’s 39mm Front End

Upgrading Harley’s 39mm Front End, Pt 2

  1. Place the lower dust shield over the triple tree stem and onto the lower triple tree surface, and then slide the bearing onto the triple tree stem and down the stem onto the dust shield.

Words and Photos: Jeff Leighton

Upgrading Harley’s 39mm Front End

Upgrading Harley’s 39mm Front End, Pt 2

  1. Slide the lower triple tree into the neck.

Words and Photos: Jeff Leighton

Upgrading Harley’s 39mm Front End

Upgrading Harley’s 39mm Front End, Pt 2

  1. Place the top tree onto the stem and while holding the lower tree; insert the top triple tree nut to hold the triple tree set together.

Words and Photos: Jeff Leighton

Upgrading Harley’s 39mm Front End

Upgrading Harley’s 39mm Front End, Pt 2

  1. Tighten the nut until it is snug then back the nut off. The fall away will need to be adjusted at the end of the build, but to assure the bearings are in the cups, snugging the bolt will bring it all together.

Words and Photos: Jeff Leighton

Upgrading Harley’s 39mm Front End

Upgrading Harley’s 39mm Front End, Pt 2

  1. Start the fork disassembly process by removing the fork drain screw.

Words and Photos: Jeff Leighton

Upgrading Harley’s 39mm Front End

Upgrading Harley’s 39mm Front End, Pt 2

  1. Place a drain pan under the fork lower and drain the fork oil out of both forks.

Words and Photos: Jeff Leighton

Upgrading Harley’s 39mm Front End

Upgrading Harley’s 39mm Front End, Pt 2

  1. To remove the fork tube cap, using the correct tool can prevent unwanted scratches and marring of the caps surface area. In this case I chose to use my Jims fork cap remover tool (part No. 3805-0013).

Words and Photos: Jeff Leighton

Harley-Davidson's stock production 39mm front ends on Dynas, FXRs, and Sportys aren't exactly optimized. They need a little help if you really want them to perform. Hell, even changing the weight of the fork oil used internally can upgrade how they react on the road. Luckily for us (and you) there are a ton of performance options from the aftermarket, and taking advantage of some of these items will make your Harley ride much better and look good in the process. We are building a stiffer and better 39mm front end with the help of a set of Chassis Design Company triple trees, Gold Valve emulators and a spring kit from Race Tech, a set of The Speed Merchant’s preload adjusters, and some oil from Bel-Ray. We will be putting it all together with the right tools for the job thanks to Jims USA and its line of specialty tools. Here’s the second part of how we did it.

Sources

Bel-Ray

Chassis Design Co.

JIMS USA

Race Tech

The Speed Merchant