I've had nothing but trouble with Tecumseh engines, fairly good luck with Briggs engines and limited experience with Kohler and Kawasaki engines... between my brother and I we have worked on or had several dozen small engines, a couple Tecumseh engines have worked for a short time, most of the briggs engines run until something stupid happens (crank bearing goes out, valve seat falls out, plug threads strip out, etc). Many of the engines I've had are old since we do auctions and I'm a cheap bastage... We've learned how interchangeable most of the engines are, putting Magnetron coils on points engines and so forth.