WELCOME to LMF...
You will likely find a complete used mower easier than finding just a Used engine.
What is this engine on .? :smile:KennyV
Get the model number of the machine, go to smallenginewarehouse.com, scroll down to repower, click on it, click on Craftsman, look for your model number, click on it if it's there and see what may be available as a repower option.
Mad Mackie in CT:laughing: