Author Topic: Dragonfly Coil.  (Read 370 times)

0 Members and 1 Guest are viewing this topic.

Offline Sgtbiro

  • Full Member
  • **
  • Join Date: Oct 2017
  • Posts: 139
  • Location: Newcastle upon Tyne
Dragonfly Coil.
« on: 17 Nov 2020 at 20:59 »
Hi
Could some kind Dragonfly owner please send me a picture of the correct location on the frame for the coil on a Dragonfly, it would be much appreciated.

Cheers Kevin..

Offline Dads bike

  • Full Member
  • **
  • Join Date: Jul 2020
  • Posts: 94
  • Location: Norfolk, UK
Re: Dragonfly Coil.
« Reply #1 on: 17 Nov 2020 at 23:26 »
Hope this helps

Steve

Offline eddie

  • Master Member
  • ****
  • Join Date: Mar 2006
  • Posts: 1640
  • Location: Hampshire, UK
Re: Dragonfly Coil.
« Reply #2 on: 18 Nov 2020 at 08:05 »
The coil in the photo looks like a Lucas - the original Miller coil was black and slightly smaller. There was a shaped rubber block between the coil and the frame tube.

  Regards,
                Eddie.

Offline Sgtbiro

  • Full Member
  • **
  • Join Date: Oct 2017
  • Posts: 139
  • Location: Newcastle upon Tyne
Re: Dragonfly Coil.
« Reply #3 on: 19 Nov 2020 at 17:42 »
Thanks for the reply's guys can I ask another question, on the wiring diagram it shows a black wire coming from the ignition switch to the coil and another wire going from the coil to the points. I am fitting a 12v Lucas coil with + and - terminals can someone please tell me it the terminals are pole sensitive or can you attach the wires to either terminal   

Cheers Kevin..

Offline Dads bike

  • Full Member
  • **
  • Join Date: Jul 2020
  • Posts: 94
  • Location: Norfolk, UK
Re: Dragonfly Coil.
« Reply #4 on: 19 Nov 2020 at 19:57 »
Evening Kevin
At a risk of me muddying things: a coil will work wired either way round, HOWEVER,
Read the description found at “Coil Polarity-Moss Motoring” answers the question clearly and may just prevent future misfiring.

Steve

Offline eddie

  • Master Member
  • ****
  • Join Date: Mar 2006
  • Posts: 1640
  • Location: Hampshire, UK
Re: Dragonfly Coil.
« Reply #5 on: 20 Nov 2020 at 10:08 »
In the good old days, the 2 terminals for the primary winding were marked 'BAT' and 'CB' (contact breaker). Now, as I understand it, the 'CB' terminal was common to both the primary and secondary windings, so it completed the HT circuit to earth. If the connections were reversed, the primary winding would then also be part of the circuit for the HT voltage - thus passing HT voltage into the main wiring harness. Now the HT amperage is minimal, so probably wouldn't affect any normal electrical equipment - but I'm not so sure that applies when 'electronic equipment' (modern voltage regulators, etc.) are fitted. The modern system of labelling the primary terminals '+' & '-' gives no clue as to the internal wiring of the coil, and thus, which way round it should be wired.

   Regards,
                  Eddie.

Offline Red

  • Senior Member
  • ***
  • Join Date: Oct 2009
  • Posts: 200
  • Location: Basingstoke, Hampshire
Re: Dragonfly Coil.
« Reply #6 on: 20 Nov 2020 at 17:05 »
Have a look at the attached PDF - half way down - Warning Coil Connections

Roy

Offline Sgtbiro

  • Full Member
  • **
  • Join Date: Oct 2017
  • Posts: 139
  • Location: Newcastle upon Tyne
Re: Dragonfly Coil.
« Reply #7 on: 20 Nov 2020 at 19:16 »
Once again thank you all for your reply's its brilliant to get so much good advice .

Cheers Kevin..