New oil-fired steam boiler is revving and clicking

Hi all -- I have a newly (about 2 months) installed Weil-McLain steam boiler with a Beckett GeniSys 7505 oil burner/controller. When the thermostat reaches the desired temperature, the burner usually spends several minutes making a series of rapid fire revving and clicking sounds. Is this what post-purge sounds like? Is it supposed to last this long, or is something wrong?



If my description is lacking, I'd be happy to post a short video someplace if that would help.



Thanks very much for any insight.

New oil-fired steam boiler is revving and clicking