Evolution Industries' Sportster Open-Primary Beltdrive System: Get Evol

To get started, the six bolts on the clutch plate had to be removed, along with the clutch plates themselves (be sure to note the order of the discs when removing them).

Once the new primary gasket was in place, Anthony installed the primary (along with the front and rear pulley) to check for proper alignment. To check the alignment of the pulleys, Anthony used a metal straightedge covered with painter's tape to protect the new drive. The alignment was pretty close, but it required a .065-inch spacer on the front pulley to make it perfect.

With the alignment dialed in, the primary came off. Then the rotor was bolted to the front pulley using the eight bolts supplied in Evolution's kit.

Then, with the drain plug installed, the primary was filled. The stock setup takes up to 32 oz. of fluid, but because of the new beltdrive system, 8 oz. (about the size of a standard Red Bull can) was all that was needed.

The belt was next. However, the pulley shoulder plates had to come off first. Then the belt was slid in place, and the shoulder plates were bolted back on. (The belt slack should be 1/4-inch to 1/2-inch up and down).

Next, Anthony installed the clutch plates, starting with the thickest steel plate and ending with the friction plate.