Miller Blue Star 2E AC/DC Question

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Howdy y'all,I picked up a new to me Blue Star a few weeks ago and have been working to get it running using a lot of the information from this website. Unfortunately, whoever owned this machine before me cut off the decal portion that had the SN stamped, and there doesn't seem to be any other stickers or SN indicators. Hopefully, that won't affect my question.I have 70 AC OCV at the work and electrode terminals around 3000 RPM, the machine will strike a strong arc, but as soon as the engine loads, it falls in RPM, the arc dies and then the engine revs back up to weld RPM. I also have proper voltage at the outlets in power mode.This is leading me to believe that this is an engine or a governor problem on the Tecumseh. Do I just need to adjust the fuel mixture screw or take the carb apart and clean it up? Engine runs strong otherwise. Any input would be appreciated! TIA.
Reply:Sounds like this is a older welder when you say {adjust the fuel mixture screw }. If so I would look at carburetor and see needs cleaning and check the rest fuel lines and tank. Dave

Originally Posted by aoestreich

Howdy y'all,I picked up a new to me Blue Star a few weeks ago and have been working to get it running using a lot of the information from this website. Unfortunately, whoever owned this machine before me cut off the decal portion that had the SN stamped, and there doesn't seem to be any other stickers or SN indicators. Hopefully, that won't affect my question.I have 70 AC OCV at the work and electrode terminals around 3000 RPM, the machine will strike a strong arc, but as soon as the engine loads, it falls in RPM, the arc dies and then the engine revs back up to weld RPM. I also have proper voltage at the outlets in power mode.This is leading me to believe that this is an engine or a governor problem on the Tecumseh. Do I just need to adjust the fuel mixture screw or take the carb apart and clean it up? Engine runs strong otherwise. Any input would be appreciated! TIA.
Reply:Get stinger and ground close enough so you can manually open up the throttle while maintaining an arc. If this works then it's a governor problem. It could be the governor spring needs moving to a different hole. Some pics would help us help you.Ol' Stonebreaker  "Experience is the name everyone gives to their mistakes"Hobart G-213 portableMiller 175 migMiller thunderbolt ac/dc stick Victor O/A setupMakita chop saw
Reply:

Originally Posted by aoestreich

Howdy y'all,I picked up a new to me Blue Star a few weeks ago and have been working to get it running using a lot of the information from this website. Unfortunately, whoever owned this machine before me cut off the decal portion that had the SN stamped, and there doesn't seem to be any other stickers or SN indicators. Hopefully, that won't affect my question.I have 70 AC OCV at the work and electrode terminals around 3000 RPM, the machine will strike a strong arc, but as soon as the engine loads, it falls in RPM, the arc dies and then the engine revs back up to weld RPM. I also have proper voltage at the outlets in power mode.This is leading me to believe that this is an engine or a governor problem on the Tecumseh. Do I just need to adjust the fuel mixture screw or take the carb apart and clean it up? Engine runs strong otherwise. Any input would be appreciated! TIA.
Reply:Look under Miller manuals and and there should be a trouble shooting section. There will be several different manuals based on the serial number but the basic machine and operation should be similar. Not sure if your machine has an idle control or not. If not could be a governor issue or a fuel issue like Freebird suggested.