Another R75/5 joining!

Discussion in 'Airheads' started by Michel77, Oct 26, 2013.

  1. Plaka

    Plaka Brevis illi vita est

    Joined:
    Jun 19, 2010
    Oddometer:
    4,629
    OEM used 21 watt bulbs. So 43 watts or so every time you use them. A /5 can do with as little electrical load as you can manage. LEDs make huge sense.
    #21
  2. disston

    disston ShadeTreeExpert

    Joined:
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    12,902
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    Silver Spring, Md
    I understand that mandatory blinkers were not used in 1972 but this bike was built with blinkers. Now you may fool almost any cop or even inspection agent. I have friends that got a bike thru just by saying they weren't used that year. The inspectors only expect blinkers to work if fitted sometimes.

    But reflectors are a different issue and I think they are required. The first years of /5 had reflectors on the blinkers. Those are hard to find.

    Do let us know what happens when you take it through. All our presupposing is rather pointless if it passes, ain't it? :freaky
    #22
  3. Michel77

    Michel77 Backyard Badass

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    Based on Solo Lobo's reply previously, I don't think I'll need an inspection here in WA. I just want to add blinkers for safety in the city..
    #23
  4. disston

    disston ShadeTreeExpert

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    I think that works.

    We sometimes make a big deal out of stuff that turns out to be not such a big deal. Call it an interwebs disease.
    #24
  5. elite-less

    elite-less Been here awhile

    Joined:
    Dec 21, 2009
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    561
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    The Puget Sound Convergence Zone
    Welcome to the fold! Sounds like another scrambler in the works...? :D

    I have a used set of hella style bar end signals you can have.

    I'm in Everett, a few of us reclusive airhead inmates reside in SnoCo. PM if interested.
    #25
  6. Michel77

    Michel77 Backyard Badass

    Joined:
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    A boat ride away
    Figured I'd keep this thread updated as I go along making it my own.. Got some junkyard dirtbike bars ($10 :D) fitted this weekend along with some new grips, much better position for me an I like the additional leverage of the wider bars.

    [​IMG]

    While at the junkyard, got my American Pickers hat on an found some more rusty gold :clap

    [​IMG]

    Needs some serious restoration but I'll give it a shot for $20!

    [​IMG]

    Keep you inmates posted. Elite, sending you another e-mail as I was out of town this weekend!
    #26
  7. Justus

    Justus Adventurer

    Joined:
    Oct 17, 2013
    Oddometer:
    33
    Good luck with that seat! It does look pretty cool though, what did it come from?

    Regarding the bars, are they the proper/weirdly sized BMW bars or did you shoehorn the controls onto a 7/8" bar? I'm interested in getting similar bars for my /5.
    #27
  8. Michel77

    Michel77 Backyard Badass

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    Thanks, no idea what that seat is from, I'm guessing some 60's/70's dirtbike.

    The bars are 7/8", I just used a dremel type tool to widen up the control brackets a bit, no biggie. I'd definitely recommend it, it is a big improvement.
    #28
  9. Thorazine

    Thorazine Likes exhaust fumes

    Joined:
    Sep 1, 2013
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    Lanesplittin Valhalla--Southern California
    Yes! Another rescued Airhead :freaky Hey, Michel, welcome to the asylum! I agree with the other inmates. You have and should come out ahead. Little things may pop up, but you should be OK. You got a nice bike. I like those new bars. Look up the Airheads. Go to http://www.airheads.org/ lots of members in WA & BC. Besides doing lots of rides and camp outs, they have Techdays where everyone meets up at someone's house and they work on their Airheads. There's always a few Airhead gurus there to give a hand or pass along their expertise. Plus They usually have most of the special tools for the odd or even common jobs. And beer and bratwurst is usually on hand. Quite a few Heads here on this forum--good advice found here.

    To find the actual month your bike was built, go here: http://www.bmw-z1.com/VIN/VINdecode-e.cgi Just put in your vin# (look just above the oil fill hole on the left side of the block right by the carb).

    Many good places to get the special tools. I've used this guy, and will go back for more. Again, other good sources, but check this guy out: http://www.northwoodsairheads.com/

    Good luck, and welcome again.
    #29
  10. Michel77

    Michel77 Backyard Badass

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    Hey, thanks for the welcome and all the info, much appreciated!! I'll get some tools sorted out and am in touch with a few of the local inmates as well!
    #30
  11. Michel77

    Michel77 Backyard Badass

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    So it appears I have a charging issue on the bike, it left me stranded earlier this week :cry

    I recharged the battery and it starts up just fine, so the starter is good. I kinda figured something was off as I learned more and figured out the charging light on the speedo doesn't come on, not with the ignition on, not when idling, not when riding at 3k+ rpm...
    So today I checked the fuses and bulb, all good, then pulled the tank and found the starter relay with some non-oem wiring or so it appears? Judging by the wiring diagram, those 2 disconnected blue wires are part of the charging system so I am wondering why they are not connected and also why I seem to have a new ground wire (green) connected to the relay and grounding at the coils... I haven't rewired it to stock yet to see how that goes, so for now just wondering what is going on and why anybody would make that change in the wiring, if anybody has any ideas I'd sure be glad to hear 'em!

    [​IMG]

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    And some pics of other progress (purist may avert their eyes at this point to keep the peace :freaky)

    [​IMG]

    [​IMG]
    #31
  12. bmwhacker

    bmwhacker Still on 3 wheels

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    MONTANA NATIVE from NATIVE MONTANA
    Where did you find the fenders?
    I might be looking for something similar.
    #32
  13. Big Bamboo

    Big Bamboo Aircooled & Sunbaked

    Joined:
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    That extra green wire to the coil bracket is a non original additional ground and not necessary. The other two blue wires can be connected together or there should be two shared terminals on the relay. They don't do anything through the relay, it was apparently just a convenient place to connect them. If I'm not mistaken, they form part of the turn signal wiring, so maybe there's your problem. Re; no charging light, try shorting across the rotors two slip rings and see if it comes on. If it does, you need a new rotor...
    #33
  14. tlub

    tlub Been here awhile

    Joined:
    Oct 23, 2012
    Oddometer:
    954
    Location:
    Madison, WI
    I would really recommend keeping the original parts you remove. Not having them will drastically reduce the value of the bike when you sell it. These bikes are worth a lot more stock than cobbed together with odd bits. A lot. My guess is you dropped $500 off the value with the changes so far. So for your own sake, keep everything. Put it in a box and keep it safe.
    And find an original seat pan to use. Put whatever you want on the pan. Anything else will probably bend the subframe to which it is attached. Those subframes are thinwall tubing with very defined mounting points.
    Also, all /5s came with turn signals. Period. If that is a long wheelbase bike, it had reflectors on the ears. Only in 70 and very early 71 did the turn signals have the end reflectors. You can find turn signals on ebay easily, and the stalks are not bad either- I paid 15 bucks for two signals and 10 for 2 stalks not long ago.
    Important- If your charging light does not light with the ignition on and not running, you will never, never create any charge. The initial excitation of the field is through that bulb, just like in so may of Bobby Bosch's systems.
    Do yourself a big favor and go onto one of the more specialized sites (like Snowbum's or Duane Ausherman's) and spend about a week learning about that bike. It is more like a German car than any bike you have owned before, and all your experience with other bikes is just enough rope to hang yourself. There are many links to completely troubleshooting the charging system (itself quite reliable) and almost anything else.
    Those front brakes need to be properly adjusted so both arms travel equally. The stock handlebars are 22mm, not 7/8. the control mounts (perches) will not properly fit 7/8" bars. Don't lose the wedge for the perches or they never will grip even 22mm bars. Grease the rear wheel splines but not too much.
    And have fun, but remember this one is different from whatever you had before
    #34
  15. elite-less

    elite-less Been here awhile

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    Lookin sharp! The charging system is simple to troubleshoot, lots of threads cover the process.

    BTW - I have a spare rotor, stator, diode board and voltage regulator we can swap if need be.
    #35
  16. Michel77

    Michel77 Backyard Badass

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    Front fender is a $10 junkyard special, rear fender is a universal fender from dime city cycles ($50 or so).

    Hey, thanks man, that's helpful! I'll have a look at the rotor tomorrow, it makes sense that those wires are for the turn signals since they were disconnected a while back.

    Hey Elite, thanks man, I may take you up on that offer and will shoot you a PM!
    #36
  17. Michel77

    Michel77 Backyard Badass

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    Thanks for all the advice, I'm keeping all take offs for future resale but in the meantime I like wrenching and making it my own and I like the scrambler look.
    I spent quite a bit of time on Snowbum's awesome site, it is very helpful. I also have the Clymer manual and learn as I go. It gets interesting if things are not stock anymore though..
    #37
  18. Michel77

    Michel77 Backyard Badass

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    Quoting this post from Diablo from another thread here as indeed the blue wires are part of the charging system. I am baffled as to why they were disconnected but I connected them again yesterday, cleaned up some grounds and other connections and sure enough my charging light is back on. Haven't tested real-life function just yet, another few weeks of work before she's back on the road..
    #38
  19. Michel77

    Michel77 Backyard Badass

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    And for future readers' reference, below the (very clear) wiring diagram I used in my fault finding (note blue wiring from charge light to start relay, diode plate and VR):

    [​IMG]
    #39
  20. Michel77

    Michel77 Backyard Badass

    Joined:
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    A boat ride away
    Some more progress shots :clap

    Elite-less came by today for a little Q&A session, learned a lot and happy to have the local expertise just a phone call away! Looking forward to meeting the rest of the locals!

    [​IMG]

    [​IMG]

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    I am liking how this is coming together, it'll have a very distinct patina to it with all these bits and pieces cobbled together :D
    #40