that looks like a clean bike, if you can ask him to go work on it for 30 mins - pull the carb and clean it. Bring a flathead, phillips, 8,10,12mm wrench, small pair of pliars, and any can of Carb Spray or Ether with a small red straw.
sorry i know you got your answer but keep this in your back pocket for ANY moped you look at also.
From my experience buying my first "running/almost" moped many years ago you MUST HAVE THE FOLLOWING:
- Another mode of transportation
- Be willing to learn and spend a lot of time scratching and banging your head when it doesnt work for no reason (patience and persistence)
- A phillips + flathead screwdriver , large and small , 8 , 10 , 12 , 14, 16 mm sockets ( and some randoms like a 7 , 17 , 23, pb blaster, vicegrips, and metric allen wrenches, thats 90% of what you need barring maybe a clutch puller)
This site is the holy grail of all moped knowledge , click the Forums button, and on the top left there is a "Search" feature, type in your question very simply, select All forums and All dates to find answers to any question you could ever ask for that bike.
happy mopeding !(edited)