Did the main
jet have anything else on it, other then the 210? Maybe a box with an"R" in it? If its just the 210, then its probably a DJ
main jet, and way big.
will be marked on the side. You'll need a magnifying glass and a good light to see it, more then likely.
Replace the Coasting enricher cover.
A new fuel filter never hurts anything but the pocket book.