I did post the one "identify" thread. I also reached out to Infiniti and sent some pictures of the frame. They claimed it was not something they made.
How worried should I be about this?Not to hyjack, but for a commercially produced "racing" frame, the welds have issues
I wouldn't be to concerned since the paint isn't cracked and it's an older chassis that would of broke them with the twisting of the frame if it was an issue.
I wouldn't be too worried either about the welds. They look "good enough" for a racing kart although I would be interested what kind of "Tier" of racing frame it represents. By that I mean price range, intended use (fastest speeds and expert tier or intended for junior racers) and so forth and that might determine the build quality, or lack thereof.
Edit your post again, friend. Of isn't a verb.
If it is, I of a six pack of beer in the fridge with your name on it.
checks my location.....By GOD TN.....reckon you don't speak Appalachian 
Nope he don’t! But we still like him!
I like free
Why has no one has mentioned the super hot & spinning clutch, that would be right next to the drivers arm?
Would a guard, even be enough protection? (mechanical & thermal)
I do have a chain guard, the previous owner never installed it.Because we like DANGER!
There's typically a clutch/chain guard there, but the drivers also wear a long sleeved suit at the same time so he or she will feel slow warmth through the cloth instead of an abrupt sting and singed flesh if he or she were driving naked. That's a pretty good safety margin provided the standards are adhered to.
Also, driver is seated on the left side of a kart that is designed to turn left, go straight and turn left again. Engine is on the right. Wonder how it would be if it was pushed to the far right to where it is directly in front of the right rear tire? Wouldn't it be better to be mounted on the left side of a kart designed to turn left, or am I totally wrong here?