Update: doubling up the gaskets didn't help. I ended up getting another new carb (the correct one this time) and now it primes and fires up in 1-2 pulls every time. I guess the old carb still had something gummed up even though I cleaned every tube and jet I could find. Now if I can just find some new 16" wheels for this thing that aren't $40/wheel, it'll be good as new!
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