Hello from Ontario, Canada

Hey Y'all,

I'm Justin, Im 30 and recently bought my first motorcycle.
Its a 1979 Kz400 LTD. I bought it on FB marketplace for 250 CAD in the first week of June.
Ever since I was 18 I wanted to have a mechanical project to dive head first into learning mechanical skills and knowledge but haven't had the courage to pull the trigger on anything until now. 

So far what I have managed to accomplish is carb clean, ignition timing and valve adjustment. That, and I got the bike to start and idle but it runs like shit - probably because it came with a useless, incomplete airbox. The plan is to fashion an air box out of an air filter for old Volkswagens. The idea came from a different forum posted by a guy in roughly the same situation with their Kz400. I'm hoping this will spare me the expense and hassle of figuring out how to adapt a better carburetor for at least a while to save up for that kind of thing.
Another thing was while cleaning the rust out of the gas tank that came with the bike I discovered pinholes by the petcock, but of course not before it vomited rusty vinegar all over the garage floor. That led to me buying a new tank that hurt my wallet but looks way better.

Anyway, if you read all that - thanks! 

Im glad to join the forum!

Welcome Justin from another Ontarian. 

Sounds like you've got a good start on getting your bike road worthy again.
Find yourself a Service manual if you don't have one yet, and check everything in the Periodic Maintenance chart.