I believe I need a new motor

My mower just idles. I’ve been told the compression is low and not making enough vacuum to open the butterfly in the carb. We’ve checked the valves, and they looked good, so if they are right, it’s the rings. My mower is a late 80s self propelled. It’s not here so I don’t recall it’s hp. Where do I acquire a new motor for my mower?

I can assemble a new sensation motor for you.

By Rocco