Kewl Go Kart barn find what's it worth

Wagg's,
That's one nice looking Kart you found there.
I have an old Rupp in the garage that needs a resto. I can't get the one axle nut off of it. I have soaked it and used the impact gun on it and it won't move.
I have a few more I have that we run around the yard with. No where near as cool as the one you have.
The Yellow Yerf dogs now have their roll cages on, although one is bent up. They are 6.5 hp with the torque converters, and they fly.
The red ones with 3 1/2 hp move real well also, after you get them wound up.

You can see the mini bike sitting on the left side in the first picture.

Yard Karts.jpg

Yard Karts side.jpg

Yerf 2.jpg

Yerf 1.jpg