Nothing is necessary except breathing.
I figure a few dollars spent now will save time/money/headaches later.
Something as simple as 1/2ounce of tranny fluid poured into the spark plug hole, and turning one screw to drain the fuel should be a no brainer.
That's how I get soo many scooters soo cheaply. People get lazy, stick it in the shed till June, and spend too many hours trying to get it going. It'll sit 2-3 more years untill they give them away.
Just sayin"