Its an old thread, but nevertheless a good question travis.
I think the problem could be along these lines.
If the Huskie was run for a time on 'pump petrol' before being swapped to aspen, then the carb diaphragms would already have started to degenerate.
This is due to the solvents in petrol permeating the synthetic rubbers and nitrile material and 'washing' out the chemicals built in to maintain the suppleness.
The solvents then take over the tasks of keping the material soft whilst slowly destroying it.
When you swap to Aspen which has no solvents present, you can sometimes find that the materials start to harden up and crack.
If left dry for a period they will harden but not soften again when reintroduced to Aspen, but reintroduce pump petrol and they will be attacked by the solvents and softened once more whilst they continue to be destroyed. But this softening may have been enough to enable a start.
New diaphragms which have only ever seen Aspen will remain supple indefinately, as there are no solvents to wash out the inbuilt chemicals which maintain the suppleness.
When using Aspen it is best IMO to leave the machines 'wet' as there is nothing to gain from emptying them.
The severity of the the problem you experienced will depend on the previous exposure to the pump petrol. Machines changed whilst fairly new will not have the problems that may be experienced with older kit.
Install new diaphragms and you should be fine for ages on Aspen.
Incidentally, some of the old posts on this thread seem to hint that all machines need a retune on conversion, but that is simply untrue. Over the last 12 months I have converted hundreds of machines to Aspen, most of which have needed no retuning for aspen, in fact I usually service them first with the petrol that they come in with it if it not stale. Most will need a small retune on service to run at their best ON THE ORIGINAL FUEL.
I will then drain the tank and refill with Aspen. Then test the state of tune again and normally they need no further adjustment.
Hope this has been of some help.