Author Topic: Installation of Soupy’s suspension lowering kit  (Read 713 times)

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Offline jskene

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  • Posts: 82
  • Bike: S1000XR
  • Town: Baltimore, MD
  • Country: us
Installation of Soupy’s suspension lowering kit
on: October 18, 2018, 08:24:12 PM
Here's how I installed mine:

Installation of Soupy’s suspension lowering kit on the BMW S1000XR

Tools needed:
2 x 19mm open ended wrenches
19mm socket with extension
T55 bit with extension
T40 bit with extension
Calipers
Tape measure
Floor jack to raise rear wheel

Replace Dogbone

Place the bike on the center stand and measure the stock wheel position. I did this by measuring the distance from the top of the rear wheel nut to the hand rail. See photo below labelled "Measuring Rear Height". I placed a piece of tape on the side rail and marked the 25” point to simplify things. I wanted to drop the bike 1”, so the target was 24”.

On the S1000XR, it is very difficult to gain access to the front locknuts on the Soupy turnbuckles once they are installed. For this reason I recommend that you preadjust them before installation rather than adjusting them after installation. The following measurements are for a 1” drop. (If you want a different drop amount, you can leave the turnbuckle adjustment where it is but loosen the locknuts before installation. Install the turnbuckles as described below and adjust each long turnbuckle nut the same amount until the desired drop is achieved. You can then pull the mounting bolts out, remove the turnbuckles, tighten the locknuts, then reinstall the turnbuckles.)

Loosen each of the 2 locknuts on each turnbuckle using a pair of 19mm wrenches. For a 1” drop unscrew each end so that the distance measured from the end of the long turnbuckle nut to the inside ridge of the outer bearing ring is 51mm. This can be measured with a standard Vernier caliper using the inside measurement fingers.

Make sure that the ends are parallel and tighten the lock nuts.

With the bike on the center stand, slightly raise the rear wheel to remove tension on the dogbone bolts. I did this by placing a board parallel to the bike under the rear wheel and lifted the front end of the board with a low-profile floor jack. If there are two of you doing the job someone else could lift the rear wheal briefly by hand. Take care that the bike doesn't move forward off the center stand.
Remove the nut from right end of the rear dogbone bolt using an 18mm wrench. The bolt turns freely and so needs to be held on the other end with another 18mm wrench or a socket with an extension. Pull out the bolt.

Remove the front bolt using a T55 torx driver. This bolt can be accessed under the rear brake lever. See photo below labelled "Location of T55 Bolt Under Brake Pedal".

Remove the stock suspension dogbone casting. If you have raised the rear wheel to remove the bolts, it must now be lowered in order to provide sufficient clearance between the rear suspension arm and the shock mount.

Insert the machined spacer provided in the Soupy’s kit into the end of each turnbuckle and slide the joined pair into place where the front bolt was removed. Apply thread locker to the front bolt and slide it into place through the two turnbuckle ends and the spacer.  Tighten to 100 Nm.

Raise the rear wheel so that the hole in the rear suspension piece lines up with the rear ends of the turnbuckles. Apply threadlocker to the rear bolt threads and slide this through the left side. Install nut and tighten to 100Nm.

Lower Front Suspension
To keep the bike’s suspension in balance, the front end must be lowered by the same amount as the rear.

Loosen the 3 pinchbolts on each front fork with a T40 torx bit. Raise the real wheel a bit as described above to put force on the front wheel and raised each fork in the triple clamp the required amount by twisting it from below while pulling it upward. The change in fork height can be determined by measuring the change in distance between the top surface of the fork nut and the top surface of the triple clamp using a caliper. See photo below labelled "Measuring Change in Front Fork Height". The stock distance on my bike was 7mm. I raised each fork 28mm resulting in a new nut-to-triple clamp distance of 35mm.

Tighten the pinch bolts to 19Nm after ensuring that the side reflectors attached to the forks (on US bikes) are still pointing to the side.

The chain seemed a bit tighter after lowering, so I readjusted it.

This mod was totally worth it for me. At 6' tall I am just not tall enough to move the bike easily by walking when on it or feel completely comfortable when stopped. Now it's a breeze to walk the bike back or forward and I feel more in control when stopped.

PHOTOS

Measuring Rear Height:


Location of T55 Bolt Under Brake Pedal:


Measuring Change in Front Fork Height:




Last Edit: July 16, 2020, 11:18:20 AM by Forum Admin

 



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