3-1/2 clicks.. on the pull side of the notched wheel, when the grate is being pulled out from under the fire, and the clinkers are being jammed against the lower lip of the firepot, the linkage rebounds some, resulting in only 3 clicks.. on the push side it's usually 4 clicks.
My solenoid will eventually cycle, if the boiler's run is long enough. but it ashes every time the boiler fires up.
I do tend to get a lot of clinkers, I almost never have an ashpan without 4-6 fist or double-fist sized clinkers. Sometimes a phonebook sized one !!
I think the clinkers that get caught on the firepot lip, sometimes 'roll' around in the firepot as the grate tries to push them out of the fire.. this 'rolling' I think is one cause of the occassional piece or two of unburnt coal in an otherwise ashpan of nothing but powder and a few large clinkers. I have no way to prove this, but I just can't figure out how a bunch of pieces of perfect, shiney black coal make their way into the ashpan.. and avoid the fire completley..