I'd be checking the fuel enrichment valve (choke) and verify it's wired correctly & working (a bad valve can have the needle partially open).Verify that a good ground exists in the box and connected to the engine. A valve adjustment could make it easier to start!!!And might be causing the erratic full throttle- I'd try-it means eliminating something that doesn't cost anything but your time and aggravation. Your 33mph isn't that far off it's top speed!
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