The seat should be 90mm forward from the top of the seat to the back of the axle. Measure with a level perpendicular to earth placed against the back of the axle. The measurement from the top of the axle to the top of the seat should be 200mm. Square the front ears to the front. The bottom flush with the frame. That’s the baseline setting for the karttech seat that we use for the Kartsport NA race team.