Can’t help you with your specific situation, but a couple of suggestions.
* Be sure the chassis is not tweaked before you do anything.
* Check the scales read the same with a given weight.
* Insure that your tires have the same diameter from side to side.
* Lock down the steering shaft and adjust the toe in/out to zero. Leave the shaft locked down during the entire test.
* Make sure the king-pins are not bent.
* The surface for the scales has to be flat and level.
*Contact the club or the track promoter and ask if they can put you in touch with someone that has experience in your class.
Always weigh in at a track sometime during practice. It’s common that scales will vary from track to track and sometimes from weekend to weekend.
Hopefully a knowable person can give you some better advice.
LAD Specialties customer / tony kart / rotax / kt100