Where to get a racing kart frame?

[anderkart]

Also, I look at these pictures, If I used any of the bike motor mounts it appears that it would bolt through the top and rear of my engine in those bolt holes. Wouldn't it be upside down/backwards?

Those racing shifterkart motor mounts I mentioned are made to fit Honda CR80/125cc motocross engines, NOT that Lifan engine in your pic.

Lifan riped off/cloned the design of that engine from the old Honda trail-90/Early-ATC engines Honda sold 40 years ago. Its motor mount design is totally different from modern Honda's motocross engines.

You'd have to mod/build your own custom mount. None of the shifter racekart parts manufactures would bother to make a mount for that engine because it wouldnt have a chance of being competitively raced.