Just my 2 cents...
If it changed when you went up/down hill, it is likely a carb adjustment issue as you seem to know and resolved. Did it sit for a while with fuel in the carb? I agree with the "if it ain't broke, don't 'fix' it" comments, with the exception of a few things. It may not hurt to properly clean that carb and put a new kit on it if you know that it has sat up with fuel in it for a prolonged period. A kit is readily available for about $12 (if I remember correctly). It's not like your taking a head off or machining anything. Cleaning a carb is a maintenance item, not a repair, so technically you aren't fixing something that isn't broke, you are just doing maintenance. It's also pretty simple on these engines. These carbs are about as simple as any you'll work on. Anyway, just my thoughts.
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