The engine on your Toro is most likely an LCT engine. Liquid Combustion Technology Inc. and CPC Certified Parts Corp. purchased the assets of Tecumseh at least 10 years ago. Both Chinese companies, they produce primarily private label engines for equipment manufacturers at a discount vs well known name brand engines like Kohler, Kawasaki, Briggs and Stratton. This doesn't help your problem however. My guess is the valves are bent slightly and not seating well enough to make power like it used to. You could remove the heads and at least check that out. Put the valves in a drill chuck and see if they are visibly bent. If they are OK, lap them in with compound and put them back together. With only 2 cylinders, you have to have good valve seal to run decent. I owned a small engine shop decades ago and old, stale gas and burned valves were among the main things we saw on a daily basis. Good luck with it.
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