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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

1905 Bosch DR4 magneto-origin?


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  #1  
Old 09-04-2014, 09:59:11 PM
d-artemis d-artemis is offline
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Question 1905 Bosch DR4 magneto-origin?

I have a Bosch DR4 magneto from my late uncle's belongings and am trying to discover what vehicle it may be from & what it may be worth (trying to sell it for extra money for my aunt). We determined from the serial number it's 1905 manufacture year. My husband thinks it's from a FN Four motorcycle just from pictures on google. I think it could be from a Model A since my great-great-uncle had stored one in my great-grandpa's barn at one time, or it could be from the Indian my great-uncle had in there as well. I just want to find out it's likely origins and a ballpark value. It's missing two of the points/plugs (whatever they were called on this), but it's in very good shape & still turns.
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  #2  
Old 09-05-2014, 01:01:09 AM
KidDynamo KidDynamo is offline
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Default Re: 1905 Bosch DR4 magneto-origin???

It has the dual ignition feature with two separate sets of points, from the look of it. That feature may make it worth somewhat north of $200 to ???

On the other hand, a tested working mag is worth more than one that looks good but is untested. Also, getting a certain price is yet another thing.
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Old 09-05-2014, 07:27:14 AM
Peter Short Peter Short is offline
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Default Re: 1905 Bosch DR4 magneto-origin???

If the serial number is 819000 and the magneto was made in Germany, then I think the date is 1910-1911.

I am no Bosch expert, just have a list of serial numbers for German and French-made magnetos, apparently taken from Bosch records.

If it is made in USA, then I don't know how the serial numbers work.
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Old 09-05-2014, 09:20:54 PM
d-artemis d-artemis is offline
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Default Re: 1905 Bosch DR4 magneto-origin?

How do you test it?? And we checked a serial number list and it fell in the year 1905. I don't know if it's German or American.
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Old 09-05-2014, 09:58:09 PM
stufforbud stufforbud is offline
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Default Re: 1905 Bosch DR4 magneto-origin?

You can test it by spinning the little sprocket on the back end and see if you can get a spark to jump from the leadout which is that terminal about an inch away and a screwdriver that is grounded to the magnets or the body of the mag. If you don't know which direction to turn it, try both as it will cause no problem. Most of the German built Bosch mags are marked made in Germany. Working ones are worth $150 to $200, non working, half that.
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Old 09-06-2014, 12:52:36 AM
Peter Short Peter Short is offline
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Default Re: 1905 Bosch DR4 magneto-origin?

Quote:
Originally Posted by d-artemis View Post
And we checked a serial number list and it fell in the year 1905.
I think you better check again - the serial number 819000 has 6 digits so 1910, 1905 has 5 digit numbers.

Testing a magneto - if you hold it and then check for spark, you may get a shock and drop it Make sure it is on a bench or carefully gripped so the above doesn't happen. I worry when people hold and play with magnetos - I wonder how many have been damaged doing this, specially impulse and flick mags.
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