Needs to be cleaned and made less restrictive. Insufficient air flow is hindering the pressure drop, thus intake of the carb. Down jetting likely allowed you to suck proportionally limited mix with the limited air, and allowed for combustion; I wouldn't run that for too too long. With the right amount of air, you may be a touch lean.
But this happens; little soap and elbow grease on the filter, add some new oil after - good to go. Or just get new foam. Either way.