[depalma]

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...

Thanks for your help.

 

[Tony the torch]

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.

 

[Monte03]

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...

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...

 

[depalma]

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...

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...

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

Thanks for all the advice!

 

[chevelle]

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...

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...

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

 

[depalma]

Is that equal to 0.04 mm?

 

[kickstarts]

.015 points - .020 plugs

 

[depalma]

And that is what in mm? My brain doesnt work in inches.

 

[depalma]

Must be .38mm and .50mm. Feels like a very tiny gap ptherwise.

 

[Tony the torch]

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.

 

[sixball]

And that is what in mm? My brain doesnt work in inches.

Acording to my "smartphone" it's .381 MM

Sixball

 

[depalma]

Thats what I thought. Thank you!

 

[sixball]

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

 

[Tony the torch]

also with magnetos the spark plug gap should be about .018"

 

[knallert]

Depalma....

points: 0.015" X 25.4mm = 0.381 mm

sparkplug gap :0.018" X 25.4mm = 0.457 mm

thats how i learned.

and here is a good calc online..

http://www.industrial-enclosures.com/html/inch-mm-calculator.html

cheers

 

[DarkGoat]

Let's start a debate about the pros and cons of the metric system vs the standard American system!

 

[Guest]

Race Track Boys set the points at .012 and the plugs at .018..
They say more dwell time = more coil salutation = Hotter spark

Also they run a Huge condenser on the outside of the mag....

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[reverb]

...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.

 

[Guest]

Solid core wires....Non Resistor Plugs.....

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