Douglas - For Sale Items

Douglas 1913 Model P motorcycle

Douglas - Wanted Items

Douglas 1915 3 Spd-Gearbox and Clutch

Quick Comments

Reminders, links to interesting topics, bump your own topic, quick comments or any short message of interest to members. Try it out!
Please note - 500 character current limit


Dave

2025-01-07, 19:16:39
Forgotten your password?
Click the 'Log in' button in the main menu, then use the 'Forgot your password?' function to create a new one.

The new password will be sent to your email address. If your email address has changed since your last login, that method won't work as the email will go to the old address in your profile.
In this case, use the 'Contact' option in the main menu to send us a message and we can issue a new password.

Dave

2024-06-11, 21:02:05
Have you tried the new Drafts feature yet? I just lost a long message today and learned my lesson. It is a good idea to save a draft of any long post you are writing. You can then just keep writing and keep saving a draft, knowing you have a backup if there is a glitch. The draft is automatically deleted when you post the message.

Dave

2024-06-08, 19:30:04
For Sale
xman has two very nice 1950's machines available - a green 1950 mk4 and black 1951 mk5 - both in good condition and running well.

Dave

2024-06-07, 03:13:36

Dave

2024-06-03, 09:23:05
For Sale
Duncan has just listed his green and cream 1957 Dragonfly for sale with spares and documents.

Dave

2024-06-02, 09:34:05
Parts avalable
alistair still has parts available - barrels, carburettor, castings - see all listings.


Dave

2024-06-01, 19:33:27

Dave

2024-05-28, 01:09:46
Welcome to the new site!
Recommended viewing for a fast start...
 - Quick Tour of the Front Page
 - Quick Tour of the new Attachments
Learn all about attaching photos in the User Guide. Any problems with anything please Contact us     Faulty links fixed - 01June2024

EW magneto timing adjustment

Started by geomellish, 30 Mar 2016 at 12:00

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

geomellish

I need to re-time the EIC magneto to my EW350.  The magneto engages with the engine on two 90 degree dog ears. It seems to me that the only way to alter the timing of the magneto to the engine is to rotate these dog ears to an appropriate position on the magneto then fix them in place onto the cone shape drive using a small central bolt. Please see photos.

The magneto cone drive has a hole for a key/lug (missing), the dog eared piece has a slot for a key.  If I replaced the key the timing would be about 150 degrees out and in any event I can't see any method of adjusting the timing if the dog ears are fixed in one position.

Am I not getting something obvious?  Without a key in place I can't believe that the dog ear piece wouldn't slip on the magneto drive.

steveale

I read somewhere that you can loosen the points screw on some models with a taper shaft on the points side(non-keyed) and re-set the points break for the proper timing from that side.  Not sure if this mag has that type of shaft however and I will defer to the more knowledgable/experienced in this area.

eddie

If you rotate just the points, the magneto will NOT work correctly - if at all! The points need to be timed relative to the poles of the armature so that they open at, or just after, the point of maximum flux.
  If the mag on the EW does not time up correctly, I would suggest that the locating pin should be fitted in the mag armature and the drive dog replaced. Then remove the timing cover, and remesh the timing gears to give the correct timing. Leaving out the locating pin is likely to result in the timing slipping at some stage - especially on these mags with the small bolt retaining the gear on the small taper.

  Regards,
               Eddie.

steveale

Thanks Eddie, your insight on the points alignment makes absolute sense.  That's why you shouldn't rely on a single source when it comes to the internet.  :-)

geomellish

Thank you Eddie. When you say remesh the timing gears - is this fairly simple, ie can you just release and pull the upper gear out and re-insert it without messing anything else up?

I must say I wasn't expecting to have to start taking the engine apart just to re-time the magneto....

Regards, George


eddie

George,
             It looks as if you will need to draw the pinion off of the stub shaft that drives the magneto, then refit the magneto with the drive dog keyed to the armature. With the mag correctly timed, the pinion can then be refitted on the stub shaft. As the cam followers fit either side of the camwheels, it is pretty well impossible to upset the valve timing while you are doing this, but make sure you have the mag timed to the correct cylinder. To do this, remove the FRONT HT lead from the magneto and check that you can see the brass segment on the slip ring when the points are about to open with the mag fully advanced. Turn the engine forward until the REAR cylinder is at TDC with the valves rocking, turn the engine backwards about a quarter of a turn, then forward again to the correct timing point (about 40 degrees BTDC), then refit the timing pinion.

  Hope this helps,
                          Regards,
                                        Eddie.