Author Topic: Operation Spare Time - K100 "Cafe" Build  (Read 763 times)

Offline Hoffrock

  • Motobrick Curious
  • Posts: 11
Operation Spare Time - K100 "Cafe" Build
« on: July 16, 2017, 05:18:07 PM »
Hey Guys, I thought I would start a thread seems as I have been taking photos as I have been going along.


This is me: http://www.motobrick.com/index.php/topic,10137.0.html


I bought this K100 recently and have already torn into it. The first image is what I was like when I bought it, and the second is the next day when I had started tearing it down. And the Third is a photoshop image of what I'm looking to acheve.


Plans are:


Chop the tail & fabricate new rear end
[size=78%]Cafe style single seat[/size]
[size=78%]De-tab and clean up frame[/size]
Integrated rear lamps
Clip-on or clubman style bars
Try and reduce the wiring complexity. Possibly M unit if I am brave enough.
Slightly more AT tyres (kind of suits the Swedish weather, and I think they look Cool AF)
Black paint all components apart from cylinder head covers.
Relocate battery
Hide wiring as much as possible
New headlamp
Low profile instruments
Generally refurbish everything - Replacement of all rubbers/hoses etc.




Lets see how it goes.
  • Göteborg Sweden
  • 1984 K100

Offline Hoffrock

  • Motobrick Curious
  • Posts: 11
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #1 on: July 16, 2017, 05:37:26 PM »
Some progress on the build. This is kind of an assortment of different pictures from a few times at the garage. I was getting familiar with the bike and slowly dissasembling and fabricating. I made the photoshop image as a guide, but I will likely update and change things as I go along. All part of the fun I guess.



  • Göteborg Sweden
  • 1984 K100

Offline Hoffrock

  • Motobrick Curious
  • Posts: 11
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #2 on: July 16, 2017, 05:42:30 PM »
A few more progress photos.
  • Göteborg Sweden
  • 1984 K100

Offline duckytran

  • ^ Proficient Motobricker
  • Posts: 123
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #3 on: July 17, 2017, 10:59:26 AM »
Very cool looking bike you designed. Looking forward to seeing more progress pics.



  • Austin, Texas
  • 1993 K75

Offline Hoffrock

  • Motobrick Curious
  • Posts: 11
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #4 on: July 17, 2017, 04:29:57 PM »
Very cool looking bike you designed. Looking forward to seeing more progress pics.


Thanks! Hopefully it will turn out similar to the drawing.


I had a few hours this evening at the garage.


I drained off the coolant and disassembled the radiator etc. By the colour of it, it looks like it could even have been the original coolant... probably not but it came out black and smelled like sewer water. Not good when it spills all over your trousers.
The drain bung was seized and unfortunately was quite corroded. The Allen hole rounded off when I tried to Un-do it. I decided to drill it out instead, and then flushed the water pump though with fresh water. The same for the radiator.


I also managed to mask off and sand back the BMW logo and striped on the bottom end cover. Matt black and polished details looks pretty cool IMO.


Also attacked the grime on the throttle bodies. A whole can of brake cleaner and a good wire brush sorted them out. Can't wait to see them back on the engine now.
Will need to give the fuel rail the same treatment.


Has anyone anodised their fuel rails before? Could look quite cool as it's visible all the time.


I used a small hand pump to drain out the tank too. Tried leaving it for a few days to drain before, but it was having none of it.


Anyway, here are the progress pics:
  • Göteborg Sweden
  • 1984 K100

Offline Hoffrock

  • Motobrick Curious
  • Posts: 11
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #5 on: July 18, 2017, 07:20:11 AM »
I finished off the basic fabrication of the rear frame today. Decided to go for a more squared off look. Partly to do with mot having a decent enough tube bender and also I think the more square section suits the bike as a whole.


I then started using some steel rod to shake up the lines of the rear. Basically just stuck the pieces in a vice and bent and hammered them until I was satisfied. Then just cut and tack welded them.


I am wanted a larger rear section initially but it would have looked a bit too bulky. Also when I sat on it, I would have ended up with too little seat. I want to be able to move around a bit. Save the old gentlemans vegtables.


From this I plan to make some card templates and then shape the plate steel to fit.
  • Göteborg Sweden
  • 1984 K100

Offline duckytran

  • ^ Proficient Motobricker
  • Posts: 123
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #6 on: July 18, 2017, 02:16:12 PM »
Are you planning on relocating the battery to the rear seat cowl?
  • Austin, Texas
  • 1993 K75

Offline MaraudeRS

  • ^ Proficient Motobricker
  • Posts: 225
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #7 on: July 23, 2017, 11:20:06 AM »
Cool build! Can't wait to see what you do with the seat.


Sent from my iPhone using Tapatalk
  • Monterey, CA
  • 1992 K100RS

Offline Christopherguzzi

  • My first Beemer🏍.
  • ^ Proficient Motobricker
  • Posts: 118
  • It ran when it was parked........27 years ago😳.
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #8 on: July 23, 2017, 11:34:19 PM »
Best of luck with your build.   Very nice work thus far.  For what it is worth, I rather like the stock red color.   
  • Little Canada, Minnesota
  • 1986 K75C
Christopherguzzi

Offline Bluesmoke69

  • Curious
  • Posts: 8
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #9 on: August 16, 2017, 10:26:33 PM »
Looking good!!
  • Minneapolis
  • 1985 BMW k100rs

Offline Hoffrock

  • Motobrick Curious
  • Posts: 11
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #10 on: August 17, 2017, 01:17:58 PM »
So, Just got back from vacation, and have managed to spend a few days worth spannering and such on the K.


Really finding the whole process quite therapeutic actually. Its a good escape to get away from the daily grind. Just chucking on some music and getting the hands dirty.  :2thumbup:


Anyway, Progress wise... I have:


-done a full fluids change and service (All filters)
-Replaced all rubber fuel lines and the rubber breather hose.
-Drained the tank and took out all of the pipes and pump etc (Inside actually looked very clean indeed) Hurrah for daily driven bikes and good fuel circulation!  :clap:
-De-tabbed the tank and started to filler and sand it back.
-Dissasebled the front end ready for fork service and seal changes.
-Brakes are all off and ready for full service too (They will get seals changed, new pads, paint and braided hoses)
-Started making a seat pan, and working out how I an going to make it secure yet removable. I have currently gone for a captive nut solution with nylock nuts at front and a simple slide clamp for the rear. May need to go for a solid fixing at the back, butt I will see what vibration and movement is like after.
- Also decided not to go for the standard cafe rear, and will go for more of a padded tracker-brat look seat.
-Battery will likely go back where it was but I am going to use a much smaller unit if possible.
-Decided that I didn't like the matte black paint and fully dissasebled and masked off the engine again. Then coated it in gloss black engine paint, along with the swing arm etc. Everything got a good going over with a wire brush too.
-Wheels have gone for powder coating and I am currently working out what tyres will fit (it seems that the wheels on the bike are an odd size and finding the right size tyres in the tread pattern I want is proving rather difficult)
-I have used my Haynes manual to fully label the wiring harness and work out what goes where. (MY OCD was kicking in something rotten that day.) Still unsure if I am going to use the OEM controls or if I end up going for a M-unit. I think for the first go I will keep it standard and replace it further down the line if I feel the need.


Next stop is to finish up the tank sanding and primering. Then get it painted up properly.
Also need to work out what Lamp I am going to go for, and also tackle she whole "aftermarket gauge" problem. Still unsure how I am going to sort that. More reading up I expect.




Still really enjoying this project and if all goes to plan It will be finished by spring next year... It being Sweden I feel like the Fall is drawing in already...


Photos to follow directly after this post.


 :riding: :2thumbup: :euro :bmwsmile
  • Göteborg Sweden
  • 1984 K100

Offline Hoffrock

  • Motobrick Curious
  • Posts: 11
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #11 on: August 17, 2017, 01:26:39 PM »
Photos As Promised!
  • Göteborg Sweden
  • 1984 K100

Offline Hoffrock

  • Motobrick Curious
  • Posts: 11
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #12 on: August 23, 2017, 01:05:17 PM »
Hello fellow Brickers.


As I am usually on my phone, being the young feckless Millenial that I am. I have set up and Instagram account for this build.


I will still be posting here of course, as sharing is indeed caring. Plus this is an awesome resource that I'd like to contribute to where I can.


So, if any of you are on Instagram, feel free to follow the build. The tag is @moto_goteborg


 :2thumbup: :euro  Cheers guys!
  • Göteborg Sweden
  • 1984 K100

Online Laitch

  • ^ Quintessential Motobricker
  • Posts: 4056
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #13 on: August 23, 2017, 01:43:40 PM »
. . . as sharing is indeed caring.
:giggles   :hehehe :laughing-on-ground:
  • Along the Ridley in Vermont.
  • 1995 K75T 60,000 miles
I wept because I had no radials until I met a man who had no splines.

Offline Martin

  • ^ Quintessential Motobricker
  • Posts: 2631
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #14 on: August 23, 2017, 04:32:52 PM »
What's Instagram? I've only just found out about You Tube. :dunno
Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s, Lefaux, Vespa V twin

Online Laitch

  • ^ Quintessential Motobricker
  • Posts: 4056
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #15 on: August 23, 2017, 04:45:55 PM »
What's Instagram?
It's an online service that ships gift-wrapped instant coffee or Vegemite for special occasions.
  • Along the Ridley in Vermont.
  • 1995 K75T 60,000 miles
I wept because I had no radials until I met a man who had no splines.

Offline Martin

  • ^ Quintessential Motobricker
  • Posts: 2631
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #16 on: August 23, 2017, 04:50:11 PM »
Wow Yipeee. Two things I don't use. Will they do éclairs or profiteroles. :lets-eat:
Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s, Lefaux, Vespa V twin

Online Laitch

  • ^ Quintessential Motobricker
  • Posts: 4056
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #17 on: August 23, 2017, 04:58:54 PM »
Wow Yipeee. Two things I don't use.
Maybe you ought to broaden your horizons, Martin. Life isn't only about coconuts and custard. :oldguy:
  • Along the Ridley in Vermont.
  • 1995 K75T 60,000 miles
I wept because I had no radials until I met a man who had no splines.

Offline Martin

  • ^ Quintessential Motobricker
  • Posts: 2631
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #18 on: August 23, 2017, 05:05:08 PM »
Real men don't eat custard they have theirs with cream. Going back to my tree to ponder.
Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s, Lefaux, Vespa V twin

Offline Hilltopper46

  • ^ Motobrick Curious
  • Posts: 56
Re: Operation Spare Time - K100 "Cafe" Build
« Reply #19 on: August 23, 2017, 06:23:24 PM »
Custard means something different in some parts of the world than others (sort of like "pudding") :dunno2: :dunno .


Here in Cheezconsin, what's known as custard would be called ice cream in most parts of the world, but it is there is a subtle difference  :nono . Since I am a transplant (from Iowa) I can't explain it, I just know it's different. If it's important, a native Cheesehead will chime in here and 'splain it. :lets-eat:
  • East Troy, WI
  • 1995 K1100LT
Current bike - 1995 K1100LT - It RUNS!. You says Plum, DMV says Purple, BMW says Navana Violet.

Previously: 1982 XJ650 Yamaha, 1987 GoldWing, 1995 GoldWing, 2001 FLSTC, 2003 Goldwing