Looks like we are going to have to replace the engine in our mower, is a rebuilt engine comparable in quality to a new? I know there is a huge cost difference, but are they any good to use?
Except for my "hot rod" motors, I just buy a new motors, particularly if it is a Briggs & Statton, from my local farm supply store, in my case it is Rural King.
The rule here is what did the mower cost new,what could you get for it rebuilt on e-bay or just selling it? Most walk behind mowers should be tossed when the engine breaks, but riders are a different story. If the mower is worth say $1000 or more, then spending 2 or 3 hundred dollars would be sensible.
You could also look into purchasing a new engine as well. Companies like Northern Tool sell all kinds of motors. I've done this in the past with Yardman garden tractors.