Yard Kart...

[JTSpeedDemon]

Actually, looking a bit closer, the one seater is a Manco 225(American Express)! With the plastic nose piece! If you got that one and slapped a Briggs on it, that'd be one HECK of a period-correct vintage racer!
Ohhhh, the jealousy.....

 

[Dingocat]

Actually, looking a bit closer, the one seater is a Manco 225(American Express)!

Tis not an express, atleast with that front end. The fronts on them are flat like a dingo I believe

 

[JTSpeedDemon]

Well, what's tripping me off are the guard rails beside the seat, and the shape of the seat back.
Yes there does appear to be a significant amount of negative camber, but it looks like it has more on the front left wheel. Maybe it hit something at some point?