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Author Topic: 1984 K100 Cafe Racer budget build  (Read 146688 times)

Offline Froader4life

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1984 K100 Cafe Racer budget build
« on: September 28, 2013, 02:18:18 AM »
So I decided I'm finally going to start a thread on my build. I have mixed feelings on build threads and I'm not sure I'm motivated enough to continue adding stuff but here it goes. 

Got it 5 months ago. Apparently it's from Japan where a US military guy had it. Once it was shipped here at some point it was parked for no apparent reason. It had been not running for 11 years when I got it. The odo has 27,000 km on it. It was un molested and in decent shape for its age.

When I got it the only real issue I found was a hole in the tank from corrosion. I patched it but it's still seeping a little. I'm open to and fixes you guys know of. Anyways, I got it running after the usual fluid change and spline lube. I finally road it around the block (sitting on the battery and no front brakes). So now it's build time.

Now for some pictures. What I started with, an example of the direction I'm going, and a rough mock up.
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Offline Froader4life

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Re: 1984 K100 Cafe Racer budget build
« Reply #1 on: September 28, 2013, 02:27:31 AM »
I just started the fab and here's what I have so far. I made this new tail hoop section and cut off the passenger foot pegs and exhaust mounts from the foot pegs. I also have an example of how the new tail hoop is going to be angled. I just did a couple pie cuts on the stock frame.
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Offline Froader4life

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Re: 1984 K100 Cafe Racer budget build
« Reply #2 on: September 28, 2013, 02:32:53 AM »
Now for some questions. Anyone know any replacement foot pegs? It seems like there would an easy swap for the anvil style stock pegs. Also, anyone know where this intake tube came from?
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Offline wmax351

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Re: 1984 K100 Cafe Racer budget build
« Reply #3 on: September 28, 2013, 06:44:59 AM »
Quote from: Froader4life on September 28, 2013, 02:32:53 AM
Now for some questions. Anyone know any replacement foot pegs? It seems like there would an easy swap for the anvil style stock pegs. Also, anyone know where this intake tube came from?


Rare, euro only K100 naked.
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  • Albuquerque, NM
  • 91 BMW K75 Standard, 98 Moto Guzzi California EV
Bikes:
Current:1991 BMW K75 Standard, 1998 Moto Guzzi California EV11
Past: '83 BMW R65LS, '75 Honda CB550F, '69 Honda CB175, 1999 Royal Enfield Bullet 500, 1973 Triumph Tiger TR7V, 1971 BMW R75/5 in Toaster outfit, 1979 Harley Davidson XLS-1000 Sportster Roadster

Offline Grim

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Re: 1984 K100 Cafe Racer budget build
« Reply #4 on: September 28, 2013, 08:45:00 AM »
Subscribed!

And whats under the tarp? :D
You on PBB? 
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Offline Froader4life

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Re: 1984 K100 Cafe Racer budget build
« Reply #5 on: September 28, 2013, 12:56:33 PM »
Quote from: Grim on September 28, 2013, 08:45:00 AM
Subscribed!

And whats under the tarp? :D
You on PBB?

What's PBB?

That's my first love. My off road truck.
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Offline Grim

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Re: 1984 K100 Cafe Racer budget build
« Reply #6 on: September 28, 2013, 01:28:04 PM »
Quote from: Froader4life on September 28, 2013, 12:56:33 PM
Quote from: Grim on September 28, 2013, 08:45:00 AM
Subscribed!

And whats under the tarp? :D
You on PBB?

What's PBB?

That's my first love. My off road truck.

Sweet!

I'd love to build a prerunner like that. I drool over the TC and JD long travel parts for my 86 Runner. Unfortunately about worthless in GA. :(

What the other truck in the first pic a FSB? The little bit of cage I can see looks pretty slick. You build it?

PBB= Pirate4x4 bulletin board
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Offline Froader4life

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Re: 1984 K100 Cafe Racer budget build
« Reply #7 on: September 28, 2013, 02:31:08 PM »
I actually use to work at JD Fabrication. The other truck is my buddies bronco we built together.

I only go on pirate 4x4 when I need something from the Toyota library.

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Offline Froader4life

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Re: 1984 K100 Cafe Racer budget build
« Reply #8 on: September 29, 2013, 08:11:14 PM »
So I was able to work on my bike today and order some new parts. Taillight and muffler are on their way. I got the new rear hoop mounted today. Also below is how I hid my ecu.
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Offline wmax351

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Re: 1984 K100 Cafe Racer budget build
« Reply #9 on: September 29, 2013, 11:26:12 PM »
You cut the shock mount? I see this ending badly, even if the welds are good. Too many variables.  :falldown:
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  • Albuquerque, NM
  • 91 BMW K75 Standard, 98 Moto Guzzi California EV
Bikes:
Current:1991 BMW K75 Standard, 1998 Moto Guzzi California EV11
Past: '83 BMW R65LS, '75 Honda CB550F, '69 Honda CB175, 1999 Royal Enfield Bullet 500, 1973 Triumph Tiger TR7V, 1971 BMW R75/5 in Toaster outfit, 1979 Harley Davidson XLS-1000 Sportster Roadster

Offline Froader4life

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Re: 1984 K100 Cafe Racer budget build
« Reply #10 on: September 29, 2013, 11:59:35 PM »
Quote from: wmax351 on September 29, 2013, 11:26:12 PM
You cut the shock mount? I see this ending badly, even if the welds are good. Too many variables.  :falldown:

Of course I cut the shock mount off. I showed other things that I built, I think I should be able to handle this. Too many variables? Are you kidding me bro? :hehehe
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Offline TimTyler

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Re: 1984 K100 Cafe Racer budget build
« Reply #11 on: September 30, 2013, 12:23:29 AM »
Are you moving the location of the top shock mount?

By design, the two shock mounts and the swing arm pivot point probably form an equilateral triangle.

If you move the top shock mount forward you'll be stressing things. I bet the mounting screw on the rear drive breaks off after a few good bumps in the road. Or maybe the shock will fail.
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Offline wmax351

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Re: 1984 K100 Cafe Racer budget build
« Reply #12 on: September 30, 2013, 12:49:58 AM »
Quote from: Froader4life on September 29, 2013, 11:59:35 PM
Quote from: wmax351 on September 29, 2013, 11:26:12 PM
You cut the shock mount? I see this ending badly, even if the welds are good. Too many variables.  :falldown:

Of course I cut the shock mount off. I showed other things that I built, I think I should be able to handle this. Too many variables? Are you kidding me bro? :hehehe


Ahh, you make a good point. My experience is hipster cafe racers.  :yow
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  • Albuquerque, NM
  • 91 BMW K75 Standard, 98 Moto Guzzi California EV
Bikes:
Current:1991 BMW K75 Standard, 1998 Moto Guzzi California EV11
Past: '83 BMW R65LS, '75 Honda CB550F, '69 Honda CB175, 1999 Royal Enfield Bullet 500, 1973 Triumph Tiger TR7V, 1971 BMW R75/5 in Toaster outfit, 1979 Harley Davidson XLS-1000 Sportster Roadster

Offline wmax351

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Re: 1984 K100 Cafe Racer budget build
« Reply #13 on: September 30, 2013, 12:50:52 AM »
Quote from: TimTyler on September 30, 2013, 12:23:29 AM
Are you moving the location of the top shock mount?

By design, the two shock mounts and the swing arm pivot point probably form an equilateral triangle.

If you move the top shock mount forward you'll be stressing things. I bet the mounting screw on the rear drive breaks off after a few good bumps in the road. Or maybe the shock will fail.


I have heard of the shock stud failing on a stock bike. Watch out if you change the geometry.
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  • Albuquerque, NM
  • 91 BMW K75 Standard, 98 Moto Guzzi California EV
Bikes:
Current:1991 BMW K75 Standard, 1998 Moto Guzzi California EV11
Past: '83 BMW R65LS, '75 Honda CB550F, '69 Honda CB175, 1999 Royal Enfield Bullet 500, 1973 Triumph Tiger TR7V, 1971 BMW R75/5 in Toaster outfit, 1979 Harley Davidson XLS-1000 Sportster Roadster

Offline Froader4life

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Re: 1984 K100 Cafe Racer budget build
« Reply #14 on: September 30, 2013, 10:31:01 AM »
Thanks guys for the shock input. It is going back in the same place and the only real think I'm worried about is the lower stud. I'm sure it will be fine though.

As far as the budget so far I'm in it less than $500. That includes the cost of the bike, getting it running and all parts purchased so far. The big plan is to get it completely rideable and functional and reliable, and then when I save up a little, strip it down and paint/powder coat everything. But it's going to look like a rat bike for a while first.

Next on the to do list is mount the battery, upper shock mount, and then start working on the seat/cowl. I have a pretty good idea I'm excited about for the handlebars instead of clip ons. I should be getting to that in a couple weeks or so.

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Offline johnny

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Re: 1984 K100 Cafe Racer budget build
« Reply #15 on: September 30, 2013, 11:37:02 AM »
I would mount that shock with a u bolt... that way you could slide it around on the frame rail to dial it in...

j o
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Offline Grim

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Re: 1984 K100 Cafe Racer budget build
« Reply #16 on: September 30, 2013, 02:44:02 PM »
Quote from: Froader4life on September 28, 2013, 02:32:53 AM
Now for some questions. Anyone know any replacement foot pegs? It seems like there would an easy swap for the anvil style stock pegs. Also, anyone know where this intake tube came from?
Pegs. Some ideas for you off this Wulf.
http://www.motobrick.com/index.php?topic=4723.msg29638#msg29638
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Offline Froader4life

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Re: 1984 K100 Cafe Racer budget build
« Reply #17 on: September 30, 2013, 03:14:45 PM »
Thanks grim. Those look good. I will look into buying a set if I can track one down. Just looking for a possible alternative to $350 rear sets.
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Offline Grim

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Re: 1984 K100 Cafe Racer budget build
« Reply #18 on: September 30, 2013, 04:28:00 PM »
You will probably have better luck getting K1 Pegs that are in a similar position. I more wanted you to look at that to see how they made it because chances are if you want to move the pegs back you are going to have to modify a rear set for another bike. 

Some good shots of a K1 in this thread. They put the linkage under the peg.
http://www.k100-forum.com/t5228-k1-love-it-or-hate-it
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Offline Froader4life

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Re: 1984 K100 Cafe Racer budget build
« Reply #19 on: October 04, 2013, 01:20:45 AM »
So here's a quick update. I got to spend a little time working on it today. I was excited to see how the new taillight looked on the new tail hoop. Fits perfect. It's an smoked led unit with integrated turn signals and plate light. I also got my stainless glass pack muffler. It's going to look and sound sweet. I will probably be working on it some more tomorrow, possibly making new set of handlebars.
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Offline Froader4life

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Re: 1984 K100 Cafe Racer budget build
« Reply #20 on: October 04, 2013, 09:28:35 PM »
What I did today.
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Offline Froader4life

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Re: 1984 K100 Cafe Racer budget build
« Reply #21 on: November 08, 2013, 07:27:45 PM »
So not sure if anyone here cares but I thought I would try doing another update. I have been steadily making progress on my bike. The rear cowl is very rough right now. Not exactly how I wanted but it was the best I could do with the Harley tank I started with. Also pictured is my handlebar flip.
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Offline billday

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Re: 1984 K100 Cafe Racer budget build
« Reply #22 on: November 09, 2013, 02:27:39 PM »
Nice solution with the handlebars, interested in seeing what you come up with for instruments.
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Offline TS87KLT

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Re: 1984 K100 Cafe Racer budget build
« Reply #23 on: December 02, 2013, 10:07:30 PM »
Looking very good so far!   :2thumbup:
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Offline Froader4life

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Re: 1984 K100 Cafe Racer budget build
« Reply #24 on: December 02, 2013, 11:56:26 PM »
Here is another little taste. I have put about 4 miles on it so far. Still need to make a seat and the exhaust and I'm going to swap the kick stand to the other side of the bike so I don't leave a cloud of smoke every time I start it. Just needs a little bondo, paint and powder coat and she'll be good to go...except for the hundred other little things I want to do to it.
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