try wipe it down with a cloth with some WD-40 on it, it should stop rust n that from forming
or you could try the diet coke and tin foil trick, but depends what your deck is doing ahha
decks shouldnt oxidize when theyre rawed tho, mine never do
no one here knows about those kinds of scooters haha
but i guess 700$ sounds alright for one of those, check reviews on the moped on different websites to see what its like
then physically go and look at the moped your friend is wanting to sell to see the quality and condition and all and if...