I came in late on Tecumseh line just as the manufacture went under in 2008-09 but of the engines that I have been able to repair as parts are hard to come by I did have any problems repairing once I had the parts. It seems that the Vector carburetor was a bit of pain. Now I do have one customer that has a TVT691-6008108 V-twin with twin carbs on a 2003 mower. It hasn't been a problem at all other than one carburetor wasn't choking correctly which lead to hard starting. Other techs that worked on it couldn't figure what was wrong with it. It was a simple teak of the inter carburetor choke linkage that resolve it.
Now when I was growing I had a guy behind my home that just hated Lauson and Tecumseh engines.But as I said of the engines that come into my shop I don't have problems with them except for getting parts.
If I was offered the opportunity to buy an NOS engine I would still turn it down due the parts issue. Just don't make sense to me to invite a problem of no parts. It sort like me having an old McCulloch chainsaw that was a great saw but I lost the chain oiler and had run around with a sprint can to keep the chain oiled all because they went out of business too. Now there is a new McCulloch company out there but they don't support anything the original company made.
It is actually a shame as most of the older equipment was made a lot better than today's equipment. Some of today's equipment is just junk even before they sell it.
