New old 1991 K100RS 4V

[Laitch]

Is that U-shaped molding at the aft end intact? It's indicated by the arrow in the attached image.

[Laitch]

. . . but mine seems to be missing a squarish stand-off where there is a square chunk of insulation missing on mine.

I wonder if there was some type of press-fit peg that goes into the cowl.

It's missing that stand-off because the stand-off was broken off before you received it. Max indicates a rubber peg somehow mating with that missing element.

[riots100]

It's missing that stand-off because the stand-off was broken off before you received it. Max indicates a rubber peg somehow mating with that missing element.

There is something missing for sure, but I don't think anything was broken.  The battery covers that TMG sent are well intact at the suspect end:



The bike was basically new when I purchased it and the hole in the cowl where the peg should go seems factory fresh, i.e. nothing looks to have been broken:



The missing piece probably wasn't included with the bike when sold because because of the trim package that it included. The smaller triangular covers of the original trim have a peg at the suspect end that inserts into the hole in the cowl with a plastic bushing.

  I am guessing that there was some plastic insert that went into that hole that either had a peg molded onto it or was threaded to allow those brass studs to be screwed in.  Then the rubber vacuum hose was slipped over to receive the cover clip.  The parts fiche seem to be silent on the issue.

[Laitch]

There is something missing for sure, but I don't think anything was broken. 

The missing piece probably wasn't included with the bike when sold because because of the trim package that it included. The parts fiche seem to be silent on the issue.

The fiche seems to be screaming up here. The hose-covered peg goes in that hole.To which missing piece are you referring—the one that seems broken off to me or a different one?

Here's how I see it. The threaded portion of the stud you bought is inserted into the horseshoe molding on the rear of the cover. The stud's smooth part faces to the rear. A washer is placed on the threaded part then the nut is tightened onto the washer. An imprint of a washer is visible on the interior face of the horseshoe. A piece of hose of the type indicated in the fiche is slipped over the smooth length of stud then the assembly is inserted into the hole. I don't how you'll deal with the missing piece.
If I stare at it long enough I can almost see my description working, but not quite.    The contour of the cover's aft mount seems designed to snap the cover post into place. If the part were a couple of thousand miles closer, I'd be interested to take a whack at fitting it. Speaking of whack, the fiche is selling a meter of submersible petrol hose for the application.  At least that gives hint of the finished post's diameter, and extra fuel hose is always useful.

[volador]

Your 1991 K100RS 4V rear tail cowl is not missing anything, it is not-compatible with K1100 battery covers unless you retro-fit as you have indicated by adding a mounting stud or pin to existing tail cowl side arm holes
or
purchase the K1100 tail cowl which are pretty cheap on Ebay currently

[riots100]

Your 1991 K100RS 4V rear tail cowl is not missing anything, it is not-compatible with K1100 battery covers unless you retro-fit as you have indicated by adding a mounting stud or pin to existing tail cowl side arm holes

This is what I was expecting.  Since I have no desire to paint a rear cowl, it's off to the shop as see what I can fabricate for a retro-fit.

Thanks!

[riots100]

Got an 8mm black Delrin Rod from McMaster-Carr for $4.00 for 48", cut it down, drilled and tapped a center hole to accept the brass studs from MaxBMW.  The Delrin block inserted nice and tight into the cowl.  Cut the vacuum tube to fit over the studs and mounted the new battery covers.  The retro fit turned out well, and is reversible in case I want to go back to the old style.






Time to stand down and move on to other things.

[Laitch]

Got an 8mm black Delrin Rod from McMaster-Carr for $4.00 for 48", cut it down, drilled and tapped a center hole to accept the brass studs from MaxBMW.  The Delrin block inserted nice and tight into the cowl.  Cut the vacuum tube to fit over the studs and mounted the new battery covers.  The retro fit turned out well, and is reversible in case I want to go back to the old style.

Necessity is a mother. Good work!