Chris didnt say where he is on the overall maintenance of the newly acquired bike.
I would always change the oil and filter on a used bike once I got it home, if its sat for a few years then I would change it before I rode it more than a few miles.
Chris had the bike idling for a while on one cylinder - not sure how much fuel would condense out on the cylinder walls and how much would blow out the exhaust from that. There will be some of both, and the gas in the catalytic converter is going to burn off now, might rainbow the exhaust by the muffler a bit. Might be good to ride the bike a few miles, let the exhaust cool down, ride it a few more miles, let it cool down, so any gas in the exhaust has a chance to evaporate and blow thru, instead of acting like a chimney fire in there.
If you have not changed the oil yet this is a good time for new oil and filter, before you put more than a few miles on it
If you already changed it... maybe sniff the crankcase by the oil filler cap and see if it smells like gasoline?
If the bike had a stuck float in the carbs and was draining fuel from the tank into the crankcase, then no question, then I would drain the oil and replace it, but in this case... hard to say if its necessary.
Last edited by KCW; 07-09-2019 at 10:18 AM.