I know this is an old post, but I figured it might be worth reviving in the interest of tall OTK guys like myself…
Have you guys made much progress on your setup? If not, what are the main complaints he has? You’d want to do different things depending on whats going on, so I don’t want to just say “do this one thing and it’ll solve all your problems”. I can give you 2 pieces of general advice based on what I’ve learned though (very shortened in terms of what I went through to arrive at them):
1- Use only OTK parts, start with the baseline setup, and put your seat in the factory recommended spot for your height. I wasted way too much time trying to figure out setups using douglas LV wheels on mine, since my kart didn’t come with OTK ones. I only recently put on some MXJs and was really surprised how much better the kart felt. I should have considered earlier that all the OTK stuff is designed to work together, and having something like different wheels would throw everything else off.
2- Make sure your seat fits closely to your ribs, and as evenly as possible across them so you can lean on it as much as you need to. I started with an imaf seat which had very little upper rib support, and the kart got way more consistent and planted the outside rear better when I switched to an OTK seat (which was more flat on the sides). I could lean more naturally on the seat, and I could feel the weight transfer much more, helping IR lift.
Generally the best setups I’ve found for myself have been with H or HH axles for high grip, and pretty much baseline for everything else, but I’m still working to improve it since I haven’t done many races with it and have a lot more options to try.
In all my experience since I got a tony kart, I’ve felt like they’re a little too wobbly/unstable, and its hard to get it to take a “set” consistently through corners. Is this something you’re dealing with too? I’m curious if its related to driver height or if it happens for everyone on OTK karts because of the soft tubing. For what its worth, I tried the lower rear ride height setting back when i had the imaf seat and was on likely too soft of an axle for the conditions, but that just made the kart tighter. I’m curious if that’d be a good direction to go now.