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Magdyno Question-DBD34, et al #19195 01/01/07 10:09 pm
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Posts: 56
rockitdoc Offline OP
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The magdyno on my DBD34 has a screw-nut bit on the face with the contact points. Hard to describe so take a look at the pic below.

Question is: is the screw inside the long nut with the slot in it supposed to move? If so, how does it come out? It appears to be threaded, but the slot in the screw is bunged up and I don't want to damage it further.

A better question may be: is it worth trying to restore this piece or are they readily available?

Thanks,
[img] [IMG]http://img.photobucket.com/albums/v207/rockitdoc/MagdynoScrewBolt.jpg [/img][/IMG]


1960 DBD34
1974 Commando
1976 R90S
1985 RGS1000SFC
2012 ST1300
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Re: Magdyno Question-DBD34, et al #19196 01/01/07 10:10 pm
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rockitdoc Offline OP
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Here's the pic:
[Linked Image]


1960 DBD34
1974 Commando
1976 R90S
1985 RGS1000SFC
2012 ST1300
Re: Magdyno Question-DBD34, et al #19197 01/01/07 11:29 pm
Joined: Feb 2002
Posts: 246
GOLD S-TARvin R.I.P. Offline
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rockitdoc,
It's an "earth terminal" for the mag. The internal screw is RH thread.(lefty Lucy) Maybe try a little heat and gentle persuasion. 2c


GOLD S-TARvin
OVBSAOC # 1625
1960 DBD34 Gold Star
1956 DB34 Gold Star
1969 Bonneville
several basket case Triumphs
Re: Magdyno Question-DBD34, et al #19198 01/02/07 1:20 am
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rockitdoc Offline OP
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Does it thread out away from the mag, or toward the mag? The 'donut' on the thread seems like it would prevent removal away from the mag? Yeah?


1960 DBD34
1974 Commando
1976 R90S
1985 RGS1000SFC
2012 ST1300
Re: Magdyno Question-DBD34, et al #19199 01/02/07 2:17 am
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GOLD S-TARvin R.I.P. Offline
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Your basicly looking at three pieces. A stud threaded on both sides with a "donut" in the middle, the internally threaded hex, and a set screw inside the hex. The donut lines up with the hole in the cover. Everything is RH thread. Are you looking into having the mag rebuilt with a modern condenser? Will you be using a 6V dynamo?
Is the crank out of the engine?


GOLD S-TARvin
OVBSAOC # 1625
1960 DBD34 Gold Star
1956 DB34 Gold Star
1969 Bonneville
several basket case Triumphs
Re: Magdyno Question-DBD34, et al #19200 01/02/07 3:02 pm
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rockitdoc Offline OP
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Starvin,

Thanks, that explains alot.
I would consider any mod that made it more reliable without sacrificing outward originality. I plan to show it. Everything is apart, but getting ready to reassemble in next month or so.

Thanks,


1960 DBD34
1974 Commando
1976 R90S
1985 RGS1000SFC
2012 ST1300
Re: Magdyno Question-DBD34, et al #19201 01/02/07 3:11 pm
Joined: Oct 2004
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B
BSAPhill Offline
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Rockitdoc, if you need parts for your mag you could try Sean Hawker at Hawker Electrical in the UK, what he can't get he has made so he should be able to help.

Web-Site:

http://www.hawkerelectrical.co.uk

Re: Magdyno Question-DBD34, et al #19202 01/02/07 5:22 pm
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RF Whatley Offline
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Quote
Originally posted by GOLD S-TARvin:
It's an "earth terminal" for the mag.
IMHO it's an earth terminal for the generator (dynamo) since the mag grounds through the engine cases to the sparkplug without the aid of any outside wiring. The wire from this item should be run to the E terminal on the voltage regulator, along with a lead to the battery + terminal.

:bigt:


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: Magdyno Question-DBD34, et al #19203 01/02/07 6:45 pm
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rockitdoc Offline OP
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Can you tell me more about the conversion of the Magdyno to a more modern system or lead me to a source?
Thanks,


1960 DBD34
1974 Commando
1976 R90S
1985 RGS1000SFC
2012 ST1300
Re: Magdyno Question-DBD34, et al #19204 01/02/07 6:48 pm
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rick e. Online Content
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Good question BTW. Its a earth terminal, but I don't think the factory harness ever connected to it. (late b34's)It just sits there un-used to the best of my knowledge....

On my factory b34 the common point ground is under the seat on the frame.


"Back in the garage with my [***] detector
Carbon monoxide making sure it's effective...
----THE CLASH-----

Re: Magdyno Question-DBD34, et al #19205 01/02/07 6:58 pm
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rockitdoc Offline OP
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Yeah, mine had no connection there before disassembly. That's why I wondered what it was.


1960 DBD34
1974 Commando
1976 R90S
1985 RGS1000SFC
2012 ST1300
Re: Magdyno Question-DBD34, et al #19206 01/04/07 9:19 am
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LJ. Offline
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Thanks for bringing this subject up Rocketdoc! I have also wondered if this (Earth Wire Holder) should be connected up somewhere on my BSA M21. You can see a new one on this page from Independent Magneto supplies UK.

http://www.magneto.co.uk/acatalog/Index.html

Didnt know the inner screw was right threaded.


LJ.
*******
1940 BSA M20 500cc Girder/Rigid- In Bits!
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7 500cc Girder/Plunger Star Twin-Black
1953 BSA B33 500cc Teles/Plunger-Maroon
1961 BSA A10 650cc Golden Flash-Blue
1961 BSA A10 650cc Golden Flash-Red
Re: Magdyno Question-DBD34, et al #19207 01/04/07 9:38 am
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triton thrasher Online Content
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Quote
Originally posted by rockitdoc:
Can you tell me more about the conversion of the Magdyno to a more modern system or lead me to a source?
Thanks,
I don't know about USA sources, except some Goldie experts posting here seem to sell stuff like Alton alternators and electronic ignition..

Before you improve the magdyno, consider keeping it standard. If you can put up with a 35W halogen headlamp and ignition timing that might not be perfect at 7,000rpm, then a Lucas mag and dynamo is a good reliable system. I'm told that an electronic regulator is more or less a necessity nowadays and I'm prepared to believe that.

If you like to experiment and fiddle with your bike, you may find the upgrades rewarding. If you're looking for fit and forget instant improvement with no downside, you may be frustrated.


Amateur Loctite enthusiast.
Re: Magdyno Question-DBD34, et al #19208 01/04/07 1:43 pm
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RF Whatley Offline
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Quote
Originally posted by rockitdoc:
Can you tell me more about the conversion of the Magdyno to a more modern system or lead me to a source?
Try...
https://ssl.kundenserver.de/s33990955.shoplite.de/sess/utn;jsessionid=15459d028ac5c86/shopdata/index.shopscript

Go to "product overview", then "magdyno" to see the fully electronic version for only E720 !!


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: Magdyno Question-DBD34, et al #19209 01/04/07 1:54 pm
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RF Whatley Offline
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Quote
Originally posted by rick e.:
Its a earth terminal, but I don't think the factory harness ever connected to it. It just sits there un-used to the best of my knowledge....

On my factory b34 the common point ground is under the seat on the frame.
That's true, it is unconnected, but that doesn't mean that leaving it that way is a great idea. Numerous period British bikes provided no grounding wire to important pieces such as the headlamp. As late as 1970, there was no tail lamp ground wire on BSA and Triumphs. They simply didn't grasp the concept of fully wired "grounding".

Battery charging on a generator bike is greatly dependent on supplying a common "earth" connection between the regulator, battery and generator body. The first line of a period Lucas generator troubleshooting booklet says to check the connection at the E terminal of the regulator.

Hope this helps! :bigt:


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

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