Guess what

About a month ago I bought me another SEM magneto that is not working,
It is missing the pick-up coil and spring, along with the ignition lead.
Hopefully there is a spark when I get the missing parts. No big hopes though.

SEM stands for AB Svenska ElektroMagneter Åmål, an existing company. Theay are not the least interested in answering any questons about the old magnets. Either that or their contact email address is not working.

Getting closer

Bought some 1/2" stainless axles, thread taps and dies from the interweb. Most everything went sour. Managed to buy 304 instead of 303 material for the axles. Tried to save some money and bought cheep BSCY thread dies that probably are made in India and worthless. (my lathe is missing the low gear that would allow me to make threads)

Anyway, have made axles that are almost ready. Missing only lubrication grooves and hexagon in one end, for adjustment (3/8" spanner). 

Also:
Bought an expensive extra long 4mm bore for the axle center hole for lubrication. Managed to get "unlucky when thinking" and burned the bore at once. After re-thinking and re-sharpening of the bore I managed to drill the 105mm deep holes in the center of the axles. (only 85mm deep in the longer axles).

Girder

Started looking closer att the girder fork i bought. There are some parts missing, the top yoke and the steering stem column/axle,

I have not found any pictures of the same forg model, for reference, on the internet or in any books I've got. Have asked a couple of "experts" but the only ansver I have got is: -"looks like it´s made by som Swedish blacksmith". That does not help me mch.

The data I really would want is the lenght ocf the top linkage arms and if possible the steeering axis angle. As it is, I probably will make the upper linkage lenght somewhat shorter than the lover ones, to make the fork parallel to the steering stem. Or maybe I will simulate the action in some computer progarm.

Anyway. The axles are not good, besides I'm missing one axle, the other tree all have some issues.

To the left. The original 3/8 BSC thread has been re-threaded to UNC
The one middle is the least bad one. The 3/8 thread cleaned out pretty well.
The one to the right, see below.

The axle is very worn and the 3/8 BSC thread in a bad state.

Thougt I should give the thread a try just for the fun of it and it turrned out pretty good. That does not matter since the axle is bad anyway. And since it is the same model as the missing axle, I think it's not much more work to make two of them at the same time. Now I have to find me some 1/2 inch axle to start from.

The lubrication slit will be a challange since I have no milling machine. Migt replace it with a bushing instead.

 

Magneto

In my quest for sparks I have started piling up useful things. Junk might be a better word.

Todays visit to a swapmeet got me a SEM magneto and a brand new 18mm Lodge spark plug that might be useful for the 350cc engine.

Yesterdays swapmeet got me a brand new ignition coil, that might fit the Wico magneto that came with the 600cc engine.

The used coil at the bottom..

At last weeks swapmeet I got me a pile of used and new spark plugs for both engines.

Forks

Even though the update frequecy on this blog is close to infinity, the project is not completely dead. I am constantly looking for possible parts for the project. Today I bought a girder fork, or at least half of it with the intention of making the missing parts myself.

Sorry to say I do not know from what bicycle, moped or motorcycle it came. Neither did the seller. Would have been easier if I knew how the parts should look like.

If the knowledge is out there, please let me know the make / brand.