[SCOBRAC]

The filters are not the problem.. a more restrictive filter (which Hellings are not) would slow your idle down.. Did you straighten the carb bodies with a straight edge?? What were the tolerances used?

HMMMMMMMMmmmm??? Also when you reassembled them did you do it in the same way you took them apart, keeping track of which body and jet plates went with each body. If you didn't and you also didn't true the housings, bodies and jet plates you likely have a vacuum leak at the carb.. It isn't a good idea to use compressed air on a carb without filtering first..

What lash did you set at the accelerator pump housing? You should have a few thousands to 15 thousanths gap. Did you change the primary set screw setting? (accessable from under the carb) If no, were you keeping track that you reinstalled the primary plate and the secondary in their respective positions?? If yes, how much did you open or close the primarys?

All of the items listed can cause the problem you describe..

Good luck..