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2025-06-04, 05:57:00
Does anyone have the specifications for the oil inlet valve spring for early 2 3/4 engines - Part number 424.   I have tried to order one from the club spares but apparently Jeff Swan is indisposed at the moment.

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2025-05-19, 09:23:12
I am looking for a carburettor for veteran Douglas motorcycle engine-13651. Could you please help me with this?

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2025-01-07, 19:16:39
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2024-06-11, 21:02:05
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Magneto mounting - 1930 S6

Started by Michael Scott, 22 Sep 2008 at 14:49

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Michael Scott

 :question:  Can anyone help me with a dimension drawing of the "plate" that goes bewteen the crankcase and the base of the magneto on my 1930 S6 retoration?
Obviously the thickness is critical and I could reasonably easily measure up the rest of the piece which I presumably will have to manufacture.
regards
Michael

eddie

Michael,
              The magneto on an S6 does not have a plate - instead it sits on 4 steel buttons to help insulate it from the heat of the engine. In the top of the crankcase you will find 4 holes about 3/16" dia to take these buttons. I will measure the buttons for my S6 and post the dimensions tomorrow.
                            Regards,
                                           Eddie.

Doug

#2
Michael,

See also this post for a similar question, with pictures of the tablet spacer (well, a replacment)-

https://www.douglasmotorcycles.net/index.php/topic,2116.0.html

-Doug

Michael Scott

Quote from: eddie on 22 Sep 2008 at 18:41
Michael,
              The magneto on an S6 does not have a plate - instead it sits on 4 steel buttons to help insulate it from the heat of the engine. In the top of the crankcase you will find 4 holes about 3/16" dia to take these buttons. I will measure the buttons for my S6 and post the dimensions tomorrow.
                            Regards,
                                           Eddie.

Many thanks.  I had noted the witness marks.  There are two indents on the bottom of the magneto which led me to wonder if there was a plate with posts on each side
regards
Michael

eddie

Michael,
               I have checked the magneto pads on my S6 and they are .750" dia x .200" thick with a spigot .187"dia x .125"long on the underside.
                                  Regards,
                                            Eddie.

Michael Scott

 :)Many thanks
I will get the trusty lathe fired up
Regards
Michael