Jockey Journal Forum banner
1 - 19 of 19 Posts

·
Registered
Joined
·
28 Posts
Discussion Starter · #1 ·
Hi!
Finished everything on the bike today and tried to fire it up. Nothing!

Checked and I dont get a spark from my magneto that I bought this winter. It´s a rebuilt magneto and all the parts inside are new.

When I measured between the grund screw and the magneto housing there was contact. Removed the screw but everything looked OK. Isolated good from the housing.

Even with the screw out of the housing I had contact between the screw and the housing.

Is there any more places where the magneto should be isolated?
I think it´s a Morris-Fairbanks, it´s a sportster mag mounted on my flathead.

My plan was to ride it on Tuesday som im kinda in a hurry... :rolleyes:

Thanks for your help.
 

·
Registered
Joined
·
3,691 Posts
when the points are closed that terminal is grounded. when the points are open it will give you a resistance reading because of the coil windings and condenser. make sure the wire going to this terminal is not grounded.
 

·
Registered
Joined
·
665 Posts
Hi!
Finished everything on the bike today and tried to fire it up. Nothing!

Checked and I dont get a spark from my magneto that I bought this winter. It´s a rebuilt magneto and all the parts inside are new.

When I measured between the grund screw and the magneto housing there was contact. Removed the screw but everything looked OK. Isolated good from the housing.

Even with the screw out of the housing I had contact between the screw and the housing.

Is there any more places where the magneto should be isolated?
I think it´s a Morris-Fairbanks, it´s a sportster mag mounted on my flathead.

My plan was to ride it on Tuesday som im kinda in a hurry... :rolleyes:

Thanks for your help.
Its a Fairbanks Morse magneto that has been around for ages, often the ground wire gets crushed under the cap when you install the cap and gasket, remove the ground wire from the points as a test for process of elimination, spin the mag with a wire ans spark plug installed to test...
 

·
Registered
Joined
·
28 Posts
Discussion Starter · #4 ·
Hi guys!

After a day in the garage I finally got i t working this evening. Took the whole magneto apart and cleaned everything.

Then realized the gap was way too big. Adjusted the gap and there she was, miss spark... :rolleyes:

Mounted the magneto on the flathead and made a rough timing setting and then she fired up. FINALLY!

My smile is now bigger than my head can handle... :D

I have another question for you guys, what should the gap be?

Thanks for all the advice!
 

Attachments

·
Registered
Joined
·
272 Posts
Hi guys!

After a day in the garage I finally got i t working this evening. Took the whole magneto apart and cleaned everything.

Then realized the gap was way too big. Adjusted the gap and there she was, miss spark... :rolleyes:

Mounted the magneto on the flathead and made a rough timing setting and then she fired up. FINALLY!

My smile is now bigger than my head can handle... :D

I have another question for you guys, what should the gap be?

Thanks for all the advice!
.015"

Mag instructions:
http://xlforum.net/vbportal/forums/showthread.php?t=1391033
 

·
Registered
Joined
·
3,691 Posts
according to the online converters (hint) it should be about 0.4 m/m.
the American way is to use a match book cover to set the cap.
 

·
Registered
Joined
·
887 Posts
Wow, Tony the Torch and me were calculating at the same time, both with technology........ I know I learned that stuff in school, but it'd take me toooooo long to go find a ruler and a pencil......

Sixball
 

·
Registered
Joined
·
1,301 Posts
...in my pre unit 500, It s a daily driver so possibly that s not so pro, but works pretty good: I put .018 on the spark plugs and a rolled cig paper on the mag points.
so not coils, no rotor, boyer regulator (that s no good) battery and dynamo for lights !?.
Hunt mag; Champion L87 spark plugs, NGK never worked right for me.
One kick starting (after flooding) always, if not something is wrong.
 
1 - 19 of 19 Posts
Top