My guess is you need a new spark plug.
(or you're starved for gas with a dirty carb or petcock)
get a new plug... if that doesn't help... try squirting a little gas into the carn intake... if it runs for a few minutes... then dies... you have to clean the petcock and carb and install an inline fuel filter.
Then do a plug chop.
If its brown (the plug)... try running without the air box or air filter for a short time to see if its better.
If you cleaned the points good once... you don't need to keep doing it... (though pulling a clean piece of paper through will let you know they are still clean).
Most mopeds have low miles on them... so they rarely need points.