r27 or r50/2

Discussion in 'Airheads' started by Jan, May 13, 2012.

  1. Jan

    Jan Adventurer

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    I have been thinking about getting a /2 for a while and finally set about finding one.
    I found some overpriced,some complete disasters,some stunning and some quite interesting.
    I have however stumbled upon a mint r27 and now I'm starting to wonder.....

    The idea of the /2 was to have a slow yet dependable machine with which i'd do a couple of decent sized trips around the Philippines. (yes I know about oilchanges every 1000km, slingers, contactpoints, shitty tire choice and some of the other issues)

    Am I nuts to even think about doing that with 45 year old bikes?
    And anyone know a 6V to 12V thingy to power a gps?

    As the r27 is from a friend of a friend the price is rather ok. 2000 dollar more than the r50/2's that still needs assembling of aren't running.

    So what would you go for and why? Please keep it between /2's and the r27. I know about /5 and later but they are not on the list (yet).

    6"1 250 pounds. (skinny as most here probably. )
    #1
  2. isdt BMW

    isdt BMW willserv@aol.com

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    The single would be an ok ride as they make 17hp, getting to 12 volts may be a problem due to the generator style. The R50 would be a better choice for 12v, as there are factory 12v and several ways to get 12v, one is to mount a /5 or later unit, or MZB, not sure if Omega is adaptable. Parts are more available for the twins and they can be ridden daily without fear. hope this helps.
    #2
  3. Jan

    Jan Adventurer

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    Would a 6 to 12 volt switching device work? Or is the 6V stable enough to rig an usb cable to it? It having a battery, I would presume so?

    Anyone else has an idea regarding the two bikes?

    Sent from my BlackBerry 9900 using Tapatalk
    #3
  4. Detroit Steve

    Detroit Steve Homely Adventurer

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    Where you are at, the R27 is plenty good. The R27 is geared low enough to pull my 250lb self around just fine. There is the MZ-b 12volt system you can put on any pre 1970 BMW. The best place to ask your questions is the slash2 yahoo group or the BMW vintage forum. The R27 has a battery dependent ignition system, the R50 has a magneto ignition that does need a battery to run.

    The thing to remember about the R27 is that it scale sized model of a twin. Lots of things do NOT interchange.
    #4
  5. danedg

    danedg Horizontally Opposed

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    the R50 has a magneto ignition that does need a battery to run.


    Wrong.
    The magneto ignition operates without a battery. The magneto feeds the coil that feeds the plugs. Pop Pop Fizz Fizz


    The battery supplies "backup" amps to the lighting/accesory system because the magneto is rpm dependent.

    When you come to a stop. the lights dim due to insufficient current... the battery is supposed to compensate for the lack of amperage...


    It was a good idea at the time.!
    #5
  6. Detroit Steve

    Detroit Steve Homely Adventurer

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    On the twins:

    Generator and battery is for lights etc.

    Magneto is for ignition.

    On the singles:

    Generator and battery is for the lights and ignition.

    The twins will run just fine without a battery, although the lights will be dim at low rpm and an R27 will not run without a battery.

    Both systems work fine, both sytems have strengths and weaknesses.
    #6
  7. Jan

    Jan Adventurer

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    Thanks all.

    And how to rig a gps on them (original 6v system)?

    Sent from my BlackBerry 9900 using Tapatalk
    #7
  8. Detroit Steve

    Detroit Steve Homely Adventurer

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    That would depend what voltage is needed by the GPS. The cord that plugs a GPS into your car cigarette lighter has a voltage transformer/reducer to step the voltage down from 12v. If it is less than 6 volt, then I am sure somthing could be built with Radio Shack components. Google could be your friend here.:1drink
    #8
  9. bmwloco

    bmwloco Long timer

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    I know of a gentleman who rides an R27... if memory serves, he rode it from Florida to the MOA National last year.

    I have seen it GPS equipped as well.
    #9