72' R75/5 Cafe Build Thread - Leadnuts

Discussion in 'Airheads' started by Leadnuts, Apr 24, 2012.

  1. Leadnuts

    Leadnuts do-over...

    Joined:
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    Hey everyone, I thought I'd share my process and progress as well as get some advice on tech stuff..

    I got this 1972 R75/5 towards the end of last summer. It was nice looking and drove nice but I seem to never be content with what I have until I make something out of it and after discovering this forum plans and ideas stared to develop... So a few months ago I decided to give the cafe racer idea a shot as I adore the style and classiness of the intermingling of new and old together. I have been collecting Japanese Keirin track bikes for awhile and decided to try a something a little different. The thing I have always likes about track bicycles it their shear minimalism... its the closest thing you can get to riding a line drawing around. I thought I would try a similar approach to my cafe build.

    It is moving pretty slow so due to a new addition to the family so bare with me.

    START-

    Picked it up for 1500 last summer.
    <a href="http://www.flickr.com/photos/cabea_da_nuvem/6964499588/" title="WP_000062 by Nerfrobot, on Flickr"><img src="http://farm8.staticflickr.com/7244/6964499588_8ca1cf496b.jpg" width="375" height="500" alt="WP_000062"></a>

    So the first thing I wanted to to do was work out the rough shape based off bikes I've seen.. The most dramatic change was the dual shock to mono-shock conversion. I searched high and low for info, which of course was limited.. Ended up finding Eric at Performance Welding in Bothel (in this forum) and spoke with him about a modified swing arm which he has already done a few times. I sent a model and the swing arm... and he did some sort of magic to make it happen.

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/7110620587/" title="motobracket-fin by Nerfrobot, on Flickr"><img src="http://farm8.staticflickr.com/7201/7110620587_272006e006.jpg" width="500" height="361" alt="motobracket-fin"></a>


    Which turned into..

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/7110620471/" title="IMG_20120306_120606 by Nerfrobot, on Flickr"><img src="http://farm9.staticflickr.com/8028/7110620471_5503d33f12.jpg" width="375" height="500" alt="IMG_20120306_120606"></a>

    That took a bit of time so in the mean time I wanted to work on a cafe style seat, was going to buy one but just couldn't find the right one that made me say "Oh Yeah thats the one".. So attempted to make one..

    to be continued.
    #1
  2. helion42

    helion42 Been here awhile

    Joined:
    Jan 16, 2011
    Oddometer:
    227
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    Salt Lake City, Zion Curtain, UT
    Not even the Corbin seat?

    Anyway...
    subscribin.
    :lurk
    #2
  3. Leadnuts

    Leadnuts do-over...

    Joined:
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    Oddometer:
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    So I'm drooling over the polished alloy cafe seat and depressed that its so far out of my budget...

    So I'm trying to make one. The only way I could think of is to find a gas tank and cut a cowl out of it and modify the seat pan to fit.

    An ATV gas tank from the scrap yard looked like it would work so I brought it home and scoped out the situation..

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/7110552419/" title="HTC HD7_000250 by Nerfrobot, on Flickr"><img src="http://farm6.staticflickr.com/5465/7110552419_902d6e85cb.jpg" width="500" height="375" alt="HTC HD7_000250"></a>


    Used some tape for a rough outline to cut.

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/7110553187/" title="HTC HD7_000253 by Nerfrobot, on Flickr"><img src="http://farm9.staticflickr.com/8010/7110553187_550d347bf7.jpg" width="500" height="375" alt="HTC HD7_000253"></a>


    dry fit on seat pan.

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/7110553709/" title="HTC HD7_000256 by Nerfrobot, on Flickr"><img src="http://farm6.staticflickr.com/5335/7110553709_0cf37b81f6_n.jpg" width="320" height="240" alt="HTC HD7_000256"></a>


    After seatpan modification. Also had to adjust the sub frame to fit as well.

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/7110557165/" title="HTC HD7_000263 by Nerfrobot, on Flickr"><img src="http://farm8.staticflickr.com/7245/7110557165_cd1c2b007a.jpg" width="500" height="375" alt="HTC HD7_000263"></a>

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/7110555811/" title="HTC HD7_000261 by Nerfrobot, on Flickr"><img src="http://farm6.staticflickr.com/5442/7110555811_9d127b2c85.jpg" width="500" height="375" alt="HTC HD7_000261"></a>
    #3
  4. Leadnuts

    Leadnuts do-over...

    Joined:
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    Yeah, all the ones I had see extended just ever so slightly past where I wanted it to end.. Right about where the rear drive ends is where I wanted it to cut off. As well as they all seemed to be fabric covered all the way back, I want a little leg to show for some color.

    I know... I'm too picky...haha.


    I do have to admit though, he almost had me with "Gunfighter"
    #4
  5. Boxer Metal

    Boxer Metal Mad Scientist

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    3,609
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    Chico, California
    Very nice. I Iike your swing arm upgrade.
    #5
  6. Leadnuts

    Leadnuts do-over...

    Joined:
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    So Home depot has a fiberglass pack which includes the exact amount of cloth to do a 3 layer seat pan. I've never messed with fiberglass.. interesting. Why when you see parts to buy they are a blue color but this stuff is an amber/resin tint.

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/7110557913/" title="HTC HD7_000581 by Nerfrobot, on Flickr"><img src="http://farm8.staticflickr.com/7086/7110557913_d0355f5db3.jpg" width="500" height="375" alt="HTC HD7_000581"></a>




    Also, now that my wife has started hanging around the garage she has expressed interest in maybe riding with me now and again.... which has now made me realize I will be making two seats ( single, and a double) with an easy swap system. So there will be no electrical in the seat to make that work.
    #6
  7. Leadnuts

    Leadnuts do-over...

    Joined:
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    Oddometer:
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    So I decided to cut off the flappy bits that the sub frame and exhaust connected to... With the idea I will be going with rearsets.

    This is about where I'm at at the moment. Swing arm bracket tacked on, seat fits for the most part.. along with the pan. Its starting to take the shape that is in my head. With every cut and clang I get more and more nervous.

    Also, finally found the engine cover that I've seen on a few bikes that I absolutely could not do without.

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/6939400336/" title="72'R75/5 by Nerfrobot, on Flickr"><img src="http://farm8.staticflickr.com/7133/6939400336_c3c38f88fc.jpg" width="500" height="375" alt="72'R75/5"></a>

    And with seat pan and a bit of foam decided to try and figure out a rough idea of where I would like my foot pegs.. Bricks and shims to rest my feet on for location (super high tech).

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/6964486782/" title="HTC HD7_000582 by Nerfrobot, on Flickr"><img src="http://farm8.staticflickr.com/7222/6964486782_cef0b3340a.jpg" width="375" height="500" alt="HTC HD7_000582"></a>
    #7
  8. Solo Lobo

    Solo Lobo airhead or nothing

    Joined:
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    Oddometer:
    9,669
    Location:
    Shoreline, WA
    Convergent evolution perhaps? Here's the thread

    [​IMG]
    #8
  9. Leadnuts

    Leadnuts do-over...

    Joined:
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    Oddometer:
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    KCMO
    Did Fubar do yours as well? "Too modern" haha..

    Yours is one of the ones that peaked my interest... I could not find a finished bike pic?

    Also what carbs are those with the smooth top? I like the minimalistic look.
    #9
  10. Leadnuts

    Leadnuts do-over...

    Joined:
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    Oddometer:
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    Here are a few parts I was going to use but as of today I may be changing it up a bit..

    I have always thought these turn signals were some of the nicest looking around. Classy and a nice scale.

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/6965020622/" title="P1020838 by Nerfrobot, on Flickr"><img src="http://farm8.staticflickr.com/7213/6965020622_9840d6ab52.jpg" width="500" height="375" alt="P1020838"></a>


    I thought these bar end mirrors were pretty nice and would do the job. But now I may think about some of the repro Hella bar end blinkers, as I am trying to cut down on wires and general stuff sticking out and they are visible front and rear so I end up eliminating some clutter. Though I still am unsure due to not seeing a really good pic of the Hellas.

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/7111097181/" title="P1020839 by Nerfrobot, on Flickr"><img src="http://farm8.staticflickr.com/7052/7111097181_f31430816a_n.jpg" width="320" height="240" alt="P1020839"></a>


    Originally I had found 4 of these cool 70's mics at the thrift store and had wanted to make them turn signals, which I did to one... but they just seemed a bit too much.

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/7111098361/" title="P1020840 by Nerfrobot, on Flickr"><img src="http://farm8.staticflickr.com/7038/7111098361_4d72f62081.jpg" width="500" height="375" alt="P1020840"></a>

    And here is the tail light I'm going with.. small bright and sort of retro. I'm toying with the ideo of it set up on the swing arm due to not being able to run elec. through the seat.

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/6965026940/" title="P1020843 by Nerfrobot, on Flickr"><img src="http://farm8.staticflickr.com/7125/6965026940_9f44c6f478.jpg" width="500" height="375" alt="P1020843"></a>
    #10
  11. r77toy

    r77toy Been here awhile

    Joined:
    Feb 19, 2006
    Oddometer:
    539
    Where did you get the rear engine cover to replace the aircleaner housing?
    #11
  12. oldroadie

    oldroadie Two wheel addict

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    Feb 28, 2010
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    717
    Location:
    North Alabama mountains
    I have a set of Emgo Hella type signals I bought at Barber last year but I'm not going to use them. Interested?
    #12
  13. Leadnuts

    Leadnuts do-over...

    Joined:
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    Super interested! Shall I PM you?
    #13
  14. Leadnuts

    Leadnuts do-over...

    Joined:
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    This is where I got it... The guy is super nice. He doesn't have it in his list of parts but I saw it on the picture right on the front page there in the center. You'll have to call and ask for it.

    http://www.boxercafe.com/default.htm
    #14
  15. Solo Lobo

    Solo Lobo airhead or nothing

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    Mar 16, 2004
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    9,669
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    Shoreline, WA
    That's Houseo's bike...
    #15
  16. Leadnuts

    Leadnuts do-over...

    Joined:
    Sep 7, 2011
    Oddometer:
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    Well today I had a little time after the boy went down for bed sooooo I was able to make one of two frame braces which is super awesome!

    <a href="http://www.flickr.com/photos/cabea_da_nuvem/7114387713/" title="WP_000605 by Nerfrobot, on Flickr"><img src="http://farm8.staticflickr.com/7268/7114387713_8b3b8f1a57.jpg" width="500" height="375" alt="WP_000605"></a>


    Also learned a bit of interesting info... Here in Missouri it is not necessary to even have turn signals on your bike, though if you have them they better work.

    Question of the day:

    Has anyone ever made a modification to replace the rear drum brake actuator rod with a brake cable?


    Thought of the day;

    Turn signals in back of helmet....
    #16
  17. Hawk Medicine

    Hawk Medicine Coyote's Brother

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    3,304
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    NOR CAL
    bmweuro has done the cable rear brake mod and claims that it works quite well, so I'm interested too.

    OTOH, I can tell you this for a fact. that rear wheel braking when using any of the traditional rear sets sucks. They look the biz but the rear brake pedal become usess except for signaling.

    Come on Chris... Spill the beans!
    #17
  18. Leadnuts

    Leadnuts do-over...

    Joined:
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    Thats what I'm worried about after reading around... so looking for ways to boost leverage and am looking at the stud left from where the shock connected to the drive and thinking about a bracket to hold the end of a brake cable.
    #18
  19. Leadnuts

    Leadnuts do-over...

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  20. chipsdad

    chipsdad Adventurer

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    May 1, 2011
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    Location:
    edmonton
    what did you do with the old rear shocks?? If the price is right I may have a home for them
    #20