Hot dingus dang, son! Great job, good looking kart, very clean. Welds ground pretty, many extra cable clamps, header insulated, non-hemi 212 breather filtered uphill, choke/gas stickers added, good throttle return spring added (not very tight though), steering shaft cotter pinned for easy removal, good 3-point harness, etc.
Those are the kind of finicky things I like to do all the time, functionality before all else. All that praise being laid on................Let me just point to a couple of other finicky things I like to do..............
.............The recommended stock front springs aren't right for me. I see a whole lot of travel in those A-arms that can't be used because of the small travel shocks. I'd put in longer shocks which would give more ground clearance as soon as they're installed, and the shocks would have long travel compression that would give at least a foot of travel at the tires contact patch. I'll attach pics of my 17" gas adjustable coilovers and 15.5"-25.75" air shocks, way more than you could fit on there, but you'll see what I mean, huge travel................
................There's open ends on your square tubes, which lets rain and garden hose washing inside of course, but who cares. I care about climbing in there, buckling up, and finding out there's a couple of wasp nests built in there. Ouchie. Ignore my pic showing a couple of open ends, all now have a 1.5" square of steel welded on............
The plans leave out any opposed diagonal (truss) bracing between the upper and lower frame side tubes. You're not climbing into the seat between those tubes. I'd load those spaces up with opposed diagonal bracing, which would automatically double or triple the long sides strength against flexing and bending. You could still do that even now.
BTW: If you don't even touch it anymore, you've still got a really great kart. Please say you don't leave that carb open to the atmosphere (wasps) without a filter on it, much less crank it up without one.
