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Mzb power dynamo issues

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jwonder
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Re: Mzb power dynamo issues

Post by jwonder »

Kevin,

Pictures of my installation are attached. I hid everything and made it look 100% original. No one knows it’s an upgrade! I hollowed out an original coil and ran my ignition wire through it so it looks like it is functional. I hid the coil under the tank. The boxes are all hid in the battery compartment. I have a very small 12v battery in there as well.
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James Wonder
Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York

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wa1nca
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Re: Mzb power dynamo issues

Post by wa1nca »

I was thinking about updating my r27 because my armature is bad but was concerned about the kickback issues
I emailed vape about a month ago and wanted to know if I could just get the charging system only and they replied back that the r27 system was no longer available
Just went back to their website and it says it is available in 6 weeks
I did notice this time they showed 2 advance curves in their assembly instructions
has anyone tried the 1st settings that at kickstart timing is set at 2 degrees after tdc ?
Tommy
Attachments
Screenshot_2021-04-27 Powerdynamo assembly instructions for BMW R27.png
Tommy Byrnes
54 R51/3, 55 R50/Velorex 560 sidecar, 64 R27, 68 R69US, 75 R75/6
Ashfield, Ma
USA

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jwonder
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Re: Mzb power dynamo issues

Post by jwonder »

Mine is the top setting.
James Wonder
Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York

Wurzburg
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Re: Mzb power dynamo issues

Post by Wurzburg »

James,
Thanks for the starting tips. I'll give it a try.
Jack

kbeshlian
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Joined: Wed Nov 09, 2016 8:03 am

Re: Mzb power dynamo issues

Post by kbeshlian »

James: Thanks for sending those photos. Beautiful clean installation and great idea with the hollowed coil! I will proceed as planned and see if the bl/ws kill switch wire is necessary. The manual with the unit indicates that it is for use on bikes that had a such a switch in stock form. If you are interested I'll post my results here in a few weeks when it is up and running.
Best regards,
Kevin

kbeshlian
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Re: Mzb power dynamo issues

Post by kbeshlian »

James:
I hate to be a pest but clearly you have good experience with this system. I mocked up the installation and was able to start the bike, but noted two issues that I could use some advice with:
1. As you predicted, taking out the key did not stop the engine. How did you wire a kill switch on yours? I know on my R50 that taking out the key grounded the magneto, but the switch mechanism appears to be different on the singles that did not have magnetos in stock build.
2. The turn signals did not blink on/off. I did install a 12V blinker relay but the lights just stay on.
Thanks,
Kevin

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Re: Mzb power dynamo issues

Post by wa1nca »

The bl/ws wire off the advance unit needs to grounded to turn off the ignition
Run that into the headlight switch and connect it two terminal #2 (next to the large brown wire) and it will ground the bl/ws wire to kill the spark
terminal #2 on the r27 setup was never used because it does not have a mag

Flasher lights
did you change bulbs to led bulbs ??
Tommy
Tommy Byrnes
54 R51/3, 55 R50/Velorex 560 sidecar, 64 R27, 68 R69US, 75 R75/6
Ashfield, Ma
USA

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Re: Mzb power dynamo issues

Post by jwonder »

Kevin,

You are not being a pest, that is why we are here!

1. The bl/ws wire needs to go to pin #2 on the ignition board. It will work as expected when you hook that up.
2. Ideas for why your blinkers are not working are below:
2a. If you are using LED bulbs please make sure you have the polarity right.
2b. The hot feed for the blinker should come off of pole 15 on the ignition board. See the wiring diagram link!

The wiring diagram for the turn signals is at http://benchmarkworks.com/articles/howto/signal.html.

Let me know if this helps please.

James
James Wonder
Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York

kbeshlian
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Re: Mzb power dynamo issues

Post by kbeshlian »

Thank you both! I did as you instructed with the blue/white wire and the engine starts and stops. I will tidy up the wires and routing in the coming week. I was trying to watch the function of the key switch and am guessing that pushing the key in opens the contact, taking it out closes the contact and grounds the magneto.
Thanks again,
Kevin

Michaelbc
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Re: Mzb power dynamo issues

Post by Michaelbc »

This is great information and I thank you. It seems like you must have lengthened the green wire between the advance unit and coil, contrary to the instructions. Obviously this hasn't affected performance, and allows for flexibility in locating the components. Can you be more specific re the 12v battery you used? Thanks again.

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