This was the helpful reply I got from the manufacturers when I told them about my Scorpion Trail II rubbing the Mudsling. I was alos sent two documents saying a similar thing to the solutions below:
Clearances between the tyre and swingarm on the GS LC are much less than on previous
models, so a good fit with a MudSling depends on the profile and diameter of the tyre used. Standard issue Tourance Next and Michelin Anakee fit properly with the MudSling_LC. We have not tested the Pirelli. Aggressive knobblies, like Mitas and Kenda do not fit.
Apart from tyre, we have also found considerable differences in assembly tolerances from
bike to bike which can affect the position of the large underseat plastic moulded liner. That large part is the MudSling's primary locator.
Here is an example reported to me that proved assembly differences among bikes to be true:
Two friends each bought a Mudsling GS_LC at the same time for their same year GSs. The
MudSling fit perfectly on GS #1 with sufficient clearace. The MudSling on GS #2 made contact
with the swingarm. I asked the guys to swap MudSlings to determine if the variable was the
bike or the part. When they were swapped, the MudSling that fit properly on GS #1, did NOT fit
GS #2. Conversly, the MudSling that did not fit on GS #2, DID fit properly on GS #1.
To compensate for this possibility, there are two solutions to try to gain 3~5mm between the tyre and MudSling. Please refer to the two attached PDF files:
Possible Solution #1
1. On the left side of the bike remove the rear most zip tie from the MudSling. When you push down on the mounting flange, separating the flange from the frame tube, the bottom of the MudSling flexes closer to the swingarm. This uses the forward zip tie location as a fulcrum point
to flex the bottom of the MS forward away from the tyre.
2. Cut a 3mm rubber strip from rubber shim stock that is 6~8mm wide and 35~40mm long.
Place it in between the flange that you have pushed down and the frame tube. Then, install a
new zip-tie.
3. On the right side of the bike the flange shape is different and not flexible. You may not need
to do anything on this side. If you still need more clearance, remove the rearmost zip tie and
place a 1~2 mm shim between the flange and frame. That will net 1~2 more mm.
Possible Solution #2
1. Remove the seat to reveal two tabs which support the inner fender liner secured to the top
of the frame rails.
2. Remove the two screws securing the tabs with a T25 Torx driver.
4. Find a 3~4 mm thick rubber washer 20mm in diameter, or cut it out of flat rubber stock
and insert the rubber shims under the plastic tabs and re-tighten the screws.
These are options to try and I hope one of them works for you. Let me know how it goes.
Regards,
Andrew Serbinski
MachineartMoto
908 996 7210 x10
www.machineartmoto.com