That’s all the stock Murray kart parts right? I can’t see it not having good or at least decent steering geometry. You didn’t make the frame longer or wider. Just a bigger engine, batt box, and pedal placement right? They are the stock front wheels too aren’t they? It always live axel right?
1)Do the wheels turn ok with the front end off the ground?
2)Did both spindles turn freely without the tie rods connected?
3)Did the steering wheel turn freely without the tie rods connected?
Theo’s right that the bell crank/pitman arm looks a little long, but to me it also looks like the spindle arms aren’t at the right angle to the stub or long enough for that bell crank/pitman arm. This is all coming from the pictures so it’s hard to tell.
Could be too much positive caster. Does she drive strait as an arrow without any effort, and when you do turn it straiten back out easy?
Honestly, I feel like I’m grasping at straws here, but I really don’t think a Murray kart would have this issue unless something was damaged or changed. I’m very confused