Played a bit this morning with Juneau, the problem child 922002/HS40. First, ordered and received a new genuine Ariens NOS attachment belt - which had a LOT more meat compared to what appears to be an Oregon belt (but otherwise looked fairly new and good condition). The attachment now engages about a zillion times better (exact measurement on my part I assure you), rakes spin much faster, and the machine now throws a LOT farther/better.
Second, played with the governor/throttle adjustments. I noticed that there seems to be a limit as to what the engine will run with the governor actually working. Meaning, I follow the book in how to "just" increase RPM's, and that appears to offset the governor setting to where it doesn't kick in. Then adjust the governor to where it engages again...drops peak RPM's. No happy medium between the two at 3,550 give or take. So, the sweet spot with current parts seem to be roughly 3,300 rpm - and at that setting, there was a slight but noticeable "bounce/surge" to it.
So I lubed up the various carb linkage parts and while shut down, things seemed to free up a bit. But then with a casual glance before re-assembling everything, I noticed the governor spring seemed to be REALLY stretched out. Best way to describe it is the gov would occasionally hang up (hence the lubing things up), like it simply didn't have enough "spring" to it. Then I noticed that there are uneven gaps in the spring loops and also that the spring is attached at the highest tension spots possible.
Then I remembered a YT video I watched yesterday about surging throttle issues related to a governor spring being a tad bit weak. This guy had settings on the gov arm left to tighten the spring, which solved the issue.
So, I search for the correct part number and found it, found 2 NOS springs for $10 on ebay (figuring that The Badger probably needs one also since it exhibits similar characteristics and is only a month younger by man. date)...ordered, hopefully here soon.
Things seem to make even more sense why all the teeny tiny issues are there yet again...can't hurt, should help. Just putting the puzzle pieces together.