It depends on what you are going to use it for. For use for job power at a remote site it is probably fine. To back up your house for a week during a storm power outage, fine. To permantly install to provide reliable power for your parents respirator, I wouldn't do it.
Briggs and Stratton makes good and cheap engines. the good engines are the Industrial / Commercial series. They can be rebuilt.
You need to determine the reliability you want / need and then figure out what amount of failure you can tolerate.
