i had two stock maxis that i rode for years just stock, one i completely went through and rebuilt and crashed, one of them i didn't even do any maintenance on, dug it out of a garage, got it running, put air in the stock ass dry rotted tires, and rode it for like 2 years with absolutely no maintenance. nothing. i think one time it broke down on the side of the road because the extension tube for the reserve in the tank fell out and when i went to reserve it didn't work, but other than that zero mechanical issues.
I don't think i even changed the trans oil, just kept topping it up when it leaked out.
mopeds are super reliable if your not a dummy. tell people that.