Author Topic: K100RS "Modern" Build  (Read 1293 times)

Offline catch_me

  • Curious
  • Posts: 9
K100RS "Modern" Build
« on: July 16, 2018, 07:06:39 PM »
Hey guys,

Thought I'd start a thread as I build my 1991 K100RS to fit into the more modern era and my personal style. Picked it up as a 2 owner RS with ~47000 miles on it, and LT fairings fit to it somewhere along the way. I stripped the fairings off to find everything from mouse nests to hornet nests hiding under them. The plan is to go with a more modern naked bike look with hand made fairings. My inspirations are bikes like LaDini, Mike Flores K100, "The Hornet", and similar bikes. I plan on keeping as many parts during the build BMW as I can, and therefore am converting the front forks to a S1000RR setup which I already have. I plan to retain the original throttle tube and right hand controls as well as the heated grips. I am planning modifying the K100 throttle body to adapt to the 2 cable throttle tube (being an engineer and having a machine shop at your disposal can cause me to make projects more challenging than that need to be). I am removing the stock ABS, and I plan at this point to use a motogadget gauge, so the wiring should be fun to figure out. So far this is where she is at!
  • West Michigan
  • 1991 K100 RS

Offline DJEwen

  • ^ Proficient Motobricker
  • Posts: 220
Re: K100RS "Modern" Build
« Reply #1 on: July 17, 2018, 02:57:54 PM »
I personally couldn’t chop that bike, especially in shot number two, that’s where I’d have put the spanner’s down.

Good luck with the build.
  • Scotland
  • 1985 K100, 1987 K100 LT

Offline catch_me

  • Curious
  • Posts: 9
Re: K100RS "Modern" Build
« Reply #2 on: July 18, 2018, 08:14:19 PM »
I personally couldn’t chop that bike, especially in shot number two, that’s where I’d have put the spanner’s down.

Good luck with the build.

The bike exactly what I was looking for, right year, model, engine, and pretty worked over already with non RS parts for the right price. I do love the original bikes too, but have been looking to complete a build like this for a few years now, and knew a BMW would be the platform I would use.
  • West Michigan
  • 1991 K100 RS

Offline Martini

  • Curious
  • Posts: 7
Re: K100RS "Modern" Build
« Reply #3 on: October 15, 2018, 05:49:01 PM »
I admit this one looks surprisingly appealing stock.

Did you start the build? Where's that fork from?
  • In my head
  • Loaning an R1200S, hoping to build a K75 Café Racer next year

Offline Laitch

  • ^ Quintessential Motobricker
  • Posts: 5973
Re: K100RS "Modern" Build
« Reply #4 on: October 15, 2018, 06:35:13 PM »
Where's that fork from?
The first post tells us it's from an S1000RR.
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 miles
I wept because I had no radials until I met a man who had no splines.
http://www.motobrick.com/index.php/topic,296.msg53303.html#msg53303

Offline Barry in IN

  • ^ Proficient Motobricker
  • Posts: 144
Re: K100RS "Modern" Build
« Reply #5 on: October 15, 2018, 09:31:40 PM »
Looked nice.
  • Indiana
  • 1992 K75S Lili Von Shtuppe
A pox on cafe “builders”

Offline Martini

  • Curious
  • Posts: 7
Re: K100RS "Modern" Build
« Reply #6 on: October 16, 2018, 03:50:35 AM »
The first post tells us it's from an S1000RR.
Sorry I missed that.

Anyway, that's my dream precisely: a brick with an S1000RR fork
  • In my head
  • Loaning an R1200S, hoping to build a K75 Café Racer next year

Offline catch_me

  • Curious
  • Posts: 9
Re: K100RS "Modern" Build
« Reply #7 on: October 16, 2018, 10:39:19 AM »
I admit this one looks surprisingly appealing stock.

Did you start the build? Where's that fork from?

Yeah the forks are from a S1000RR. I bought them with all the controls and brakes. The goal is to make the bike out of as many stock BMW parts as possible, such as retaining the S1000RR push/pull throttle, stock heated grips, etc. I have been pretty busy lately, but when I get spare moments I have been researching and putting together my wiring diagram and parts list. I am currently reading Ron Fournier's sheet metal books, as I plan to do all my own sheet metal work as well. Hopefully later in the winter I will have some body work on the frame and a semi mocked up body shape! Then I can really start updating the thread.
  • West Michigan
  • 1991 K100 RS

Offline Martini

  • Curious
  • Posts: 7
Re: K100RS "Modern" Build
« Reply #8 on: October 16, 2018, 10:56:36 AM »
In your research, have you found people using active suspension forks?
  • In my head
  • Loaning an R1200S, hoping to build a K75 Café Racer next year

Offline catch_me

  • Curious
  • Posts: 9
Re: K100RS "Modern" Build
« Reply #9 on: October 16, 2018, 11:07:40 AM »
In your research, have you found people using active suspension forks?

I have not found anyone using them. That really gets complicated with the CANBUS system of the S1000RR. A lot of guys using them are just using the forks and retaining the stock K100 controls, or using controls off Ducati and Kawasaki bikes. I don't mind manually adjusting the suspension, as I have done plenty of it when I worked on my ATV long travel suspension.
  • West Michigan
  • 1991 K100 RS

Offline iboeboz

  • Curious
  • Posts: 1
Re: K100RS "Modern" Build
« Reply #10 on: December 24, 2018, 03:18:36 PM »
Hi all. catch me, how are you getting on with this build? I’m interested in finding out more about the front end swap.
I found a greatly priced S1000R forks set from a 2014 bike but want to find out, are forks same for S1000RR and S1000R?

Thanks
  • London
  • K75

Offline catch_me

  • Curious
  • Posts: 9
Re: K100RS "Modern" Build
« Reply #11 on: January 07, 2019, 02:59:13 PM »
Hi all. catch me, how are you getting on with this build? I’m interested in finding out more about the front end swap.
I found a greatly priced S1000R forks set from a 2014 bike but want to find out, are forks same for S1000RR and S1000R?

Thanks

I have not really made as much progress as I'd like, other things keep getting in the way of the project. As for the front forks, I believe the S1000RR and S1000R are the same length from what I found doing research. If you go onto AllBallsRacing.com you can look at front end bearing kits and order them for whatever forks you are planning on using. Right now I am working on figuring out the rear suspension, as I am going to make a billet aluminum subframe so I am going to go to a mono shock setup in the center of the frame.
  • West Michigan
  • 1991 K100 RS

Offline The Mighty Gryphon

  • ^ Quintessential Motobricker
  • Posts: 4154
Re: K100RS "Modern" Build
« Reply #12 on: January 07, 2019, 03:40:46 PM »
Were the body parts painted Pearl Silver or white?  That used to be such a nice looking bike.
  • 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 catch_me

  • Curious
  • Posts: 9
Re: K100RS "Modern" Build
« Reply #13 on: January 07, 2019, 03:44:08 PM »
Were the body parts painted Pearl Silver or white?  That used to be such a nice looking bike.

They are painted pearl white. Based on the mirror cap that fell off when my dad was taking it for a ride before I tore it down, that is not the original color thought. When taking the fairings off, I did find a few spots where they had been jb welded because they were cracked, which I would guess whoever installed the LT fairings onto the RS bike did to try to fix them before they were installed.
  • West Michigan
  • 1991 K100 RS

Offline The Mighty Gryphon

  • ^ Quintessential Motobricker
  • Posts: 4154
Re: K100RS "Modern" Build
« Reply #14 on: January 07, 2019, 04:52:22 PM »
That pearl white is a nice color.  Add a little pin-striping in dark blue and you have a really good looking ride.  Classic Beemer.
  • 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 Laitch

  • ^ Quintessential Motobricker
  • Posts: 5973
Re: K100RS "Modern" Build
« Reply #15 on: January 07, 2019, 05:16:36 PM »
That pearl white is a nice color.  Add a little pin-striping in dark blue and you have a really good looking ride. 
Nothing that a chopped loop and an Motogarotte can't fix.
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 miles
I wept because I had no radials until I met a man who had no splines.
http://www.motobrick.com/index.php/topic,296.msg53303.html#msg53303

Offline catch_me

  • Curious
  • Posts: 9
Re: K100RS "Modern" Build
« Reply #16 on: January 07, 2019, 07:39:40 PM »
That pearl white is a nice color.  Add a little pin-striping in dark blue and you have a really good looking ride.  Classic Beemer.

The pearl white is for sure staying. That is going to be the base tank/body color of the build I love it. I plan to add some blue and red and a black undertone to it as well (give it a little M coloring)
  • West Michigan
  • 1991 K100 RS

Offline billday

  • ^ SuperNatural Motobricker
  • Posts: 967
Re: K100RS "Modern" Build
« Reply #17 on: January 07, 2019, 07:48:03 PM »
Oh well I guess it was already trashed when somebody swapped RT for RS fairing . . .
  • New York State, USA 10977
  • 1985 K100

Offline catch_me

  • Curious
  • Posts: 9
Re: K100RS "Modern" Build
« Reply #18 on: January 07, 2019, 07:57:03 PM »
Oh well I guess it was already trashed when somebody swapped RT for RS fairing . . .

I know not everyone agrees with modifying a running bike. But aseptically I love the lines of K's, and it has a amazing platform for what I am trying to do. The bike needed plenty of love anyways, I ran into hornet and mouse nests once the fairings and airbox were off.
  • West Michigan
  • 1991 K100 RS

Offline Laitch

  • ^ Quintessential Motobricker
  • Posts: 5973
Re: K100RS "Modern" Build
« Reply #19 on: January 08, 2019, 11:22:08 AM »
. . .  aseptically I love the lines of K's . . .
Viewing them from a sterile field must give them that certain je ne sais quoi. :bmwsmile
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 miles
I wept because I had no radials until I met a man who had no splines.
http://www.motobrick.com/index.php/topic,296.msg53303.html#msg53303

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