Follow up, It was a Manco Phoenix Starbird Model 297
Could call on the model number as that's all that really matters.
I see Starbird but no Phoenix decal. Does it say both somewhere else on the kart?
The proper names Manco gave to its fun karts changed like people change their underwear. Here's a partial listing:
https://www.gokartsupply.com/mancogokarts.htm
As you can see, "Phoenix" is nothing unique but one kart has both "Phoenix" + "Starbird", the 415-361 PHOENIX STARBIRD II but
it is a 2-person kart, so not a match for yours.
Lastly here's a Model 297 manual {exploded parts diagram}:
Manco Model 297