Are you sure his brother wont want his machine back when he gets out of prison... It could be a good deal, but how long did you weld with it? It could take a while before any leaks show up. When it starts getting hot they sometimes loose power also.

Not all too bad of a price. How many hours? I'm not an engine drive expert, but I would check all the obvious stuff. Air cleaner, plugs, give a good look inside with a flashlight & see if there's any cooked wiring, or anything hacked up. Check the OCV at the terminals with a meter. You can always have a load test done on it too. Like Stephen said, make sure you get a receipt & bring a friend along to witness the deal. I know it sounds a little quirky, but if the brother gets outta prison & accuses you of stealing his machine, you got a witness you can take into a courtroom. Of course, if someone , fresh out of prison came knocking on my door accusing me of stealing his machine....Well, I think you know who the cops are going to side with. If it turns into an issue....Sam Colt's handy for some parole violator that's threatening you. :-) Good luck on it. S.W.