Kart steering sensitivity?

What would make a kart steering dart. Got two recons set up exactly alike steering geometry. (Caster/camber) Only difference is steering wheel height. Smooth driving kart is in lower position. Dart driver in top.
 
Apperantly two different classes .
Which means two different drivers . The driver strength and action come too mind .
Same tires and percentage's ?
 
Not sure about your specific set up but toe in will dart, toe out will wander, excessive caster on the right side will dart also.
 
something may be bound up. check all the heim joints and steering block everything is lubed up no rust sticky gunk build up. the steering shafts are bare steel and could rust up inside if water is left in the blocks etc. try loosening everything up spray with break cleaner then lube of your choice.
 
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