Hello
Not sure if anyone can help but here it goes.

I picked up an old as 200 welder and have gotten it to run but it will not spark an arc to weld. I have power from the 110 outlet but only get a small spark when stricking the welding rod.

any sugestions

According to the Lincoln site, the SA200 is a gasoline driven DC generator welder?
When you say 110 outlet is this a mains fed AC or DC stick welder?
Al.

This is a dc welder but it has a utility 110 outlet on the front of the machine.

This outlet is working so i do not think that it is needed to flast the exciter .

What is your open circuit voltage of the welder? They don't show electrical schematic for the control on the site, I would check you do not have a high resistance connection on the main cables and see if you can detect how it is excited, if there is separate excitation for the field, check the voltage, unless that is the same as the 110v socket?
Then if the brushes and comm. look OK then I would trouble shoot the field control pots.
Al.

Watch what you plug in to the outlet, The old SA 200s put out 110 DC.