dont play with the coil till you check if you have spark take the spark plug out put the plug clip back on the plug and lay it against the head and turn over the bike if you see spark jump on the plug your set dont touch the coil.
If you have spark i would assume that you have that crap that was on the inside of the air cleaner clogging your carb if I understood what you were talking about your air filter should have oil on it to help it catch dust but after awhile they start to rot and turn to mush.
If you have spark I would pull a part the carb and clean it
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