This is not a good test. The only way to be sure is to replace the intake O-rings, and maybe even the intake boots. See the "Air Intake Repair" guide on my website for an idea of what this entails.
It's also possible that the starter drags once the bike is hot. That's something else you may want to disassemble, clean, and repair as necessary (brushes wear out eventually, the comutator gets corroded, etc). Sure, start with the simple stuff. But it's a 30 year old bike with an unknown history. Eventually everything has to be checked, adjusted, cleaned, tweaked, repaired, etc, so that your bike doesn't hork itself and leave you stranded. Just go through the maintenance lists in your "mega-welcome".
Valves adjustments are easy, and critical. You'll need to inventory the shims and clearances you have currently so that you can obtain the shims you need for the proper clearances. The guide on my website it pretty thorough.
Thank you for your indulgence,
BassCliff

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