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MudSling rear fender mounting on the R1200R

At the BMW MOA Rally in Missouri last week we sold and installed many MudSlings for the R1200R. It is always surprising to me how one bike can differ from another in terms of assembly tolerance differences and the resulting effect on clearances with other components.  Most 12R MudSlings mounted just fine with sufficient clearance between them and the tire on one side and the shock spring cover on the other.   On two of the bikes the stock spring cover seemed to be warped, unacceptably reducing the clearance between it and the MudSling. Normally, we remove the spring cover on 12GS’s because it is easy to do so and it’s redundant anyway. On the 12R, however, the spring cover is not removable without removing the entire shock from the bike.

We solved the problem by cutting the spring cover away – with the owner’s permission. Using a short hacksaw blade in a small in-line handle, we marked a position on the cover in between the top two spring coils and sawed through it easily. It leaves about 20mm of cover near the top of the shock and is not at all visible from most viewing angles.  The result was properly restored  clearance between the shock and the MudSling, and a much better appearance since the coils are now exposed.

One other installation tip was made apparent on these R1200R MudSling installations. Before the MudSling can be slipped into place, the two stock fender liner screws need to be removed since we supply longer ones.  We found that there is a lot of Loctite red compound applied to these stock  fasteners leaving a very hard residue in the threads of the boss on the frame.  This needs to be cleared out as much as possible to allow easy installation of the new screws.  It can be done with a small diameter brush from the top after the seat is removed. You could try a stiff pipe cleaner or drive a screw in from the top to try and clear it out.  Eventually, enough stuff will be dislodged to permit proper screw installation.  Our screws are much longer, so be sure to screw them in squarely to avoid cross-threading.