Author Topic: how do you time mag for 1911-1912 Douglas flat twin motor please  (Read 3391 times)

0 Members and 1 Guest are viewing this topic.

Offline MIKE111

  • Member
  • *
  • Join Date: Mar 2015
  • Posts: 6
  • Location: Newzealand
 HI i think i have about 1911-1912 flat twin stationary engine that hope to put in early  motor bike frame that I have pity it is not A Dounglas frame  how do I time the mag it does not seem to have much compression  should they have.

Offline Hutch

  • Senior Member
  • ***
  • Join Date: Nov 2012
  • Posts: 202
  • Location: Queensland, Australia
Hi Mike111,

Welcome to the forum!

Here are the instructions out of the Douglas manual for 1911 and 1912-14 Working Instructions for timing the magneto on a 2 3/4 HP. Hopefully that covers the engine you have. A picture/engine number may be useful for forum members to identify it's year and then possibly provide more information for you.

Cheers
Ian

Offline Hutch

  • Senior Member
  • ***
  • Join Date: Nov 2012
  • Posts: 202
  • Location: Queensland, Australia
1911 Manual Parts

Offline Frank Lyn

  • Full Member
  • **
  • Join Date: Apr 2005
  • Posts: 23
  • Location: Virginia U.S.A.
Thank you Ian :!:

I have a 1910 and the 1910 Manual neatly avoids the entire internal engine disassembly - reassembly issue by saying that you should return the engine to the factory for any such service.

Could you post the next pair of pages (48-49).  I am sitting on the edge of my seat wondering what happens after "Drop the shaft into its appropriate bearing in the!"   A real cliff hanger. 

(Actually I figured out the exhaust timing from first principles but it is nice to have the Factory procedures. Without the cylinders, valves, and valve-gear installed, it is difficult to figure when the cam actually moves the valves.....  There were many trials and errors to get it to Cose the valves a bit after TDC which seems appropriate for an automatic inlet engine)

thanks again

Offline MIKE111

  • Member
  • *
  • Join Date: Mar 2015
  • Posts: 6
  • Location: Newzealand
1911 Manual Parts
                 :)many thanx for your help mike

Offline Hutch

  • Senior Member
  • ***
  • Join Date: Nov 2012
  • Posts: 202
  • Location: Queensland, Australia
No Worries Mike, hope it was of some help !. ....and to relieve Frank from the edge of his seat, here is the next 2 pages of the 1911 booklet - enjoy!

cheers

Ian