A good hint is the cast aluminum pedals which were a Kartco design.
I don't know of any manuals available, but this would seem to be one that I don't see very often. Parts are very generic and interchangeable among karts like these.
Plus, it's American made
EDIT==> But I'll be doggone if that's not a very popular frame configuration among many go kart manufacturers. A lot of copycattin' and plagiarizing going on back in the day.
Oh, okay. Only you know exactly what you have. Some kart brands like yours have a live axle but it runs inside a tube that's supported by bearings on both ends but looks like a 'one-wheel-peel' because the axle is not exposed. Very confusing just going off photos.
Looks like that's exactly what you have.
If you just have to have a manual, that's your business but you won't NEED it to repair it or service it. It will use relatively common parts plus they're just so simplistic.
I pounded out the axel due to it being bent and it was supported by bearings, they aren't a very common size but was able to find some. 3/4ID x 1-7/8 OD. What about the drive shaft and tie rods I haven't been able to find an exact match, any ideas?
I'm a fan of MFG Supply. They have flat rate shipping. Order as much as you like and they only charge you $8.95 (or something). At least they did the last time I checked.