I have a sa200 with a 163contanetal motor its a 1950 to 1960 ? first how do i find out what year it is ? . And the leads are hooked up right but its welding in straight pol. what do i need to look for . Im a union welder for 28 years just took a 30 inch down hand test and half way through the test it started to act up. this mach. is all so a red face.  please help with any info thanks  cully