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Old 05-13-2012, 06:44 AM   #1
Jan OP
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Location: Dumaguete City, Philipines
Oddometer: 34
r27 or r50/2

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. )
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Old 05-13-2012, 07:18 AM   #2
isdt BMW
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R50 or R27

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.
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Old 05-13-2012, 07:01 PM   #3
Jan OP
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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?

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Old 05-14-2012, 08:11 AM   #4
Detroit Steve
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Yup, I have had both!

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.
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Old 05-14-2012, 02:38 PM   #5
danedg
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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.!
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Old 05-15-2012, 08:28 AM   #6
Detroit Steve
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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.
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Detroit Steve screwed with this post 05-15-2012 at 08:34 AM
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Old 05-15-2012, 07:16 PM   #7
Jan OP
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r27 or r50/2

Quote:
Originally Posted by SlackerSteve View Post
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.
Thanks all.

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

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Old 05-16-2012, 04:18 AM   #8
Detroit Steve
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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.
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Old 05-16-2012, 04:40 AM   #9
bmwloco
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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.
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