Author Topic: New old 1991 K100RS 4V  (Read 736 times)

Offline riots100

  • ^ Proficient Motobricker
  • Posts: 129
Re: New old 1991 K100RS 4V
« Reply #25 on: July 26, 2018, 11:27:48 PM »
Shimmed up the rear ABS sensor, reset the ABS computer twice, ABS light extinguished.  Bike now has full functioning ABS I brakes.  (I didn't dare test the front though...)
  • Los Angeles, CA
  • 1992 K75, 2007 K1200GT, 1991 K100RS
----
Bruce Johnson

Offline mophead

  • Motobrick Curious
  • Posts: 47
Re: New old 1991 K100RS 4V
« Reply #26 on: August 05, 2018, 02:03:01 PM »
Nice find.  The K1100RS bodywork will be hotter than the stock you have now.  Had one of these and it served me well.  Just service it and ride it.
  • Amarillo, TX
  • 95 K1100RS Formerly 86 K100RS & 91 K100RS
On the back nine of life

Offline riots100

  • ^ Proficient Motobricker
  • Posts: 129
Re: New old 1991 K100RS 4V
« Reply #27 on: August 06, 2018, 12:07:23 AM »

I added a mirror leash for the left side mirror.  The right side bracket had a missing mirror post, so I ordered a new one and am awaiting delivery.


(I hope to never see this while I am riding)

I flushed the rear brakes, added new stainless steel rear brakes lines and then bled the rear brakes.  The fluid in the rear reservoir was light colored and clean.  I flushed it anyway and you can see the debris that came out.





I pulled the tank back to get at the front brake line that goes from the front master cylinder to the hard line junction going back to the modulator in anticipation of installing the front stainless steel brake lines.  I noticed a few things about what's under this tank that I didn't have on my K75.

There are two overflow lines coming from the bottom of the tank.  One line just slips on a tube spigot coming from the bottom of the tank and goes drains to the rear master cylinder area. I assume that this is the line that drains fuel and water from the tank cap area.  The other line is held onto the tube spigot on the tank with a hose clamp.  That line then runs down to a one-way valve, then down to the same area near the rear master cylinder.  What is the purpose of this second drain line from the tank?



On pulling the tank back, I saw that there is large rubber grommet that goes between the tank and frame, and that the bottom of the tank had some thick, heat reflecting material glued on.  It looks like it came from the factory. (a factory Johnny blanket perhaps?)  There is also an empty plug that is circled, what purpose does this serve?



And now for the main issue.  The aforementioned brake line from the front master cylinder terminates at a junction into a hard line going to the modulator.  That junction is buried very deep in the wiring loom below the tank, and sits under the tank mounting brackets/grommets on the frame. It is very hard to get to with a wrench and can anticipate many difficulties in removing the old line and installing the new one.



Is there a better/easier method to get to this brake line junction?

As I am getting deeper into this bike, I am more amazed at how clean everything is and the "like new" condition of all the parts.  I am beginning to doubt that I am needing to even replace the brake lines. (despite the gunk that came out from the flushing of the rear lines)


  • Los Angeles, CA
  • 1992 K75, 2007 K1200GT, 1991 K100RS
----
Bruce Johnson

Offline riots100

  • ^ Proficient Motobricker
  • Posts: 129
Re: New old 1991 K100RS 4V
« Reply #28 on: August 09, 2018, 12:41:18 AM »
I finished up all the brake work.  I got the stainless steel lines on the front.  I put about 4-5 reservoir's worth of brake fluid through each system.  Hopefully that should be enough to have flushed the system. 





To get at the brake line junction under the tank, I had to remove the white retaining clamp that held down the two rigid lines to go to/from the modulator.  Then the line had enough play in it that I could get a wrench around each end.



Changed the oil with synthetic 20W-50. I'm going wait for the Eastern Beaver Headlight relay to come from Japan before I put the tank back in place.

  • Los Angeles, CA
  • 1992 K75, 2007 K1200GT, 1991 K100RS
----
Bruce Johnson

Offline The Mighty Gryphon

  • ^ Quintessential Motobricker
  • Posts: 3687
Re: New old 1991 K100RS 4V
« Reply #29 on: August 09, 2018, 10:18:48 AM »
While the tank is off and you're waiting for the headlight relays you can wile away some time by adding a manual fan switch and maybe some LED driving lights to help the cagers see you.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '92K100RS White, '94 K75S Dakar Yellow
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'94 K75S "Cheetos"
'91 K100RS "Moby Brick Too

Offline riots100

  • ^ Proficient Motobricker
  • Posts: 129
Re: New old 1991 K100RS 4V
« Reply #30 on: August 16, 2018, 12:02:05 AM »
Got the bike back together.  I plan on installing aux driving lights, but I haven't decided where I want to mount them yet.  The common places seem to be on the lower forks, near the brake calipers or under the front fairing.  I will want to make any mounting look like it came from the factory.  The headlight relays are in and working.  The headlight seems a tad brighter.

The brakes feel the same but at least there is fresh fluid and new lines.  All the other rubber hoses look new and the bike runs like a champ.  Although, while riding around last night, I noticed that the instrument light for the fuel gauge is not working.  I assume that there is one, since I see the fuel temp gauge all lit up.

I'm going to do another shakedown ride along Mulholland Highway on Saturday.  I'm thinking that she is good to go and that I'll tackle other issues as they come up.
  • Los Angeles, CA
  • 1992 K75, 2007 K1200GT, 1991 K100RS
----
Bruce Johnson

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