Kid kart +7 seconds per lap (~1:45/lap) after adding about 7lbs (3.2 KG) to the back of the seat. It was a hot day today 28c/82f. He is only just turned 5 so anything he says about the karts handling is unreliable. Tire pressure is about 19psi all tires. Cant got past 20psi per the rules.
What I do know is that the kart is much slower. The front tires picked up quite a bit of rubber but the rear tires are clean. This makes me think the extra weight is causing the chassis to flex just enough that the rear is dragging the inside tire.
If I’m reading your post correctly, 7 seconds is a HUGE time increase.. I can’t see adding 7lbs weight would have that much effect, even in a kid kart.
Streight line speed is good . Iap times are within 0.2sec. I pulled the weight off and he went back to normal times (7 sec faster per lap). I agree that this small amount of weight shouldn’t affect times that much. This is why Im thinking the inside rear tire is dragging.
I’m going to do a test and tune this weekend and see if adding some caster or moving the weight forward helps at all.
I agree with Yousef, this feels like it has to be something unusual. Even if the weight is making the kart handle poorly, 7 seconds is extreme. Setup is worth a second at most maybe. And in KK, the kart is never really flexing and working like a full-size kart anyway, so it should be even less consequential.
