Vintage Go Kart Help

My dad "collects" all sorts of junk and came across a Go Kart that appears to be from the '40s or '50s. There is no ID tag or anything, so I thought some of you guys might know what it is. We also have a RSKart (in bottom picture) that has twin McCullough engines. Any info on that would be appreciated as well! Here are some pictures:

 

don't know but it sure is kool!

 

I am pretty sure it is a Yazoo dragster I had one for a short time a couple of years ago. Also there was one on Craig's List in sw Ohio a week or so ago

 

Awesome...that's exactly what it is! We were completely clueless, so that's a huge help. Thanks!

 

It may be a Simplex .......first kart was just like it !!!