1. Secure your bike and remove rear wheel assembly and possibly the fender
2. Jack up Bike frame to about 4 or 5 inches
3. Install your pulley and brake rotor flush against the differential using the provided bolts and RED Loctite.

(If you use the stock 1999 and under HD pulley you will need to use only the 2” x 1 1/8” preload pipe spacer and Torque bolts to stock HD specs on to the differential.)

(If you use a 2000 and up HD pulley you would have to use both the provided small 2” x 3/8” preload pipe spacer pulley spacer along with the standard 2”x 1 1/8’ preload pipe spacer. You may need to counter bore the pulley bolt holes to allow the bolts to clear the bearing.)

(If you use a chain and sprocket you will need to space the sprocket out from the differential to align it with the transmission sprocket or use a dished sprocket and you may need to machine your provided preload pipe spacers down to allow 5/8” of the differential to insert into the axle bearing. )

(Make sure to use the proper preload pipe spacers which allow 5/8” of the differential to insert into the axle bearing if not the differential will move side to side.)

4.        Take the pulley side of the differential and insert it into the pulley side (long axle shaft) of the ISS

5.        Move the pulley side of the suspension inside the belt, but leave the belt off of the pulley and position the belt toward the center of the suspension

6. Install the brake side of the ISS (short axle shaft) into the brake rotor side of the differential, make sure the differential is fully seated in the axle bearings
7. Block up the ISS high enough to align with holes on the brackets or use the wheels and move it into place in between brackets on the frame or the swingarm
8. Now pin the ISS to the mounting brackets using the shaft bolts through the unthreaded holes on the H-plates of suspension
9. Once the suspension is pinned in place with the bolts install the front 11 ¼" x 1 ¼" spacer shafts between the swingarm and the ISS using the large 1 ¾ " bolts
10. Pivot the suspension forward until you can put the belt on the pulley (the two 11 ¼” shafts must be off in the rear of the suspension to do this) once belt is on pulley install the rear 11 ¼" x 1 ¼" spacer shafts using the shorter 1 ½" bolts

(If your bike has a swing arm you will need to make a strut to eliminate the up and down movement in the swingarm so the only suspension will be in the rear end.  Block the ISS up high enough to attach struts to the fender struts. The struts bolt onto the inside or outside (depending on the bike) of the ½” fine threaded holes next to the front shock towers of the H-bracket on the ISS. Check for clearance between the pulley and strut bolt. You will attach the top of the strut to a hole in the fender strut that will allow the strut to be in a vertical position)

*(For bikes with a rubber mount motor (FXD, FLT, FXR or 05 and later Sportsters) use the provided rod end struts, the struts must be attached before the differential is installed on some models, install same as above struts. Adjust in or out to set ride height. )

11. Hook up the airline kit so the front and rear shocks are attached to each other on each side but the left and right sides are separate (refer to your airline instructions for airline kit assembly, (check pressure before riding, do not ride without any air)
12. Reinstall the Wilwood brake, add or remove spacers until caliper is centered on the rotor (steel braided lines are needed) Brakes must be bench bled with brake lower than the master cylinder. Use a piece of 3/8” thick steel to keep pistons from moving. Bleed all valves and maneuver caliper vertically to remove bubbles. (If done properly Brakes will not be spongy.)
13. Tighten down all bolts (re-torque every 5,000 miles and periodically check belt/chain tension)

-Chevy Bolt Pattern 5 X 4 ¾ with 12mm x 1.5 Studs use 12mm X 1. 5 lug nuts Make sure lug nut does not bottom out on stud.

-For the ISS only we recommend an aftermarket 18” x 9.5” Corvette rim and a 275 40 18 tire with the Flat fender kit and a 255 35 18 with the round rolled fender.  Not all rims will work with our flanges, the pilot on the wheel may hit the shoulder on the flange, test fit on hub before mounting tires. 

-The Fixed Axle requires a “deep dish”, positive offset or a negative backspace rim.  The purpose is to make the trike wide as possible using the correct backspace.  We recommend a 15” X 8”-10” wheel with a negative backspace.

-We always recommend raked triple trees to help ease the steering. You will also need to tighten the neck stem nut down much tighter than a motorcycle to avoid front end wobble.