So I came back to this thread to confirm when the last archive copy of the old forum was performed by the Wayback website. I also wanted to confirm if what I seemingly stumbled upon this evening might be a way to access lots more of the important information and threads from the old forum that are not readily available on Wayback. Although Wayback shows thread headers from the dead forum as recent as of September 2016, most of them are inaccessible when clicked on just as Sterling has pointed out above.
This evening, while trying to research information on a kart, I clicked on a link that I thought was for this webpage. Instead, it directed me to and brought up information for the forum of vintagekarts.com, aka vintagekartsforum.com. I was able to navigate the pages freely except for the search function and the sign in function. I was able to select the "Recent" and "Forums" tabs, as well as, the "Selected" and "Popular" tabs and navigate all the sub topics and pages within them. It appears everything up to early January 2016 is still there and available. Just like before, you can scroll through each of the tabs and their posts to about six or seven pages deep.
I personally believe this forum structure is better. Not only is it technologically up to date, it's also easier to use. Nonetheless, there is still lots of good information trapped within the old forum that I know many folks would like to access and perhaps take screenshots of pertinent pages to save and for future reference. Copying and pasting the webpage link doesn't work, so there is no link for me to post.
This is how I stumbled upon the information and the ability to more freely navigate the pages than using the Wayback page. It's pretty random but this is how I found it:
Using The Google search bar, type in:
Margay pro X
Then scroll down about three quarters of the page until you find a search result that reads:
Kart ID (Margay Pro X???) - Margay Vintage Karts - Vintage Kart...
www.briansantee.com > vintage > forum
Click on this search result, it will bring you to the old forum. Once there, click on the big red title letters of the forum and then you can use the four tabs along the top to select and navigate the forum; at least for threads up to January/2016. I'll be curious to know if this works for anyone else, if so please confirm by posting so here.