I was thinking diameter and wall thickness.
50mm I don’t know the wall thickness
50 mm, regardless of the wall thickness, it’s pretty stiff. That’s good.
In that case, all I can think of is the center of gravity is too high. That’s part of the reason, here in the US, we have longer axles.
So I checked my seat height it’s mounted flush to the bottom of the chassis. Should I drop it lower?
I am pretty tall. 6’9". I have a flat bottom seat and mounted the front edge flush with the bottom of the frame rails and the rear edge about 10mm below the rails. Best way I could lower my CG and get my shoulders down. It has taken a few nicks, but has held up well over the last couple of years.
I’ve ran mine 10mm below the rails and if the track surface is smooth (which it appears to be) you can probably get away with it. 2 wheels off becomes a real penalty though as you’ll hurt the seat pretty quickly.
My first trip to a bumpy track though broke the bottom out of the seat in 2 sessions without ever putting a wheel off the surface.
In retrospect I’m short and didn’t need it that low, I was just following the setup guide and I’ve since moved back to flush with the rails. In your situation it could be worth a shot.
It only takes one time over an errant engine clamp to regret that decision!
I didn’t see anywhere that you scaled the kart to see where weight percentages?
If you’re not super keen on moving the seat down, you can move it back, or tilt it back.
It’s not the same as lowering the seat of course, but it adds to the download on the rear to help keep it a bit more planted.
That said, it could be you left/right distribution too.
Yeah I agree the seat could be moved down and back more, but I’m still with James. I want to see the side-to-side percentages, because I really think that’s the root of this all.