Plumber

Hi, having turned 60 almost 2 years ago I’m looking for a project. I’ve never owned a bike but have always worked on cars over the years. I’ve been looking for something vintage to restore then ride. Don’t laugh but I fancy a wee 50cc having had shots of my mate’s bikes back in the late 70’s. A Fizzie would be ideal but prices have gone mental. I’ve spotted a couple of Yamaha YB 50’s that need restoration but having googled them. There doesn’t seem to be any parts available. Am I just looking in the wrong places or are all parts discontinued? Any other general advice would be appreciated. Thanks