As Dave pointed out, the kit makers may have stated the weight of there prototype planes but during the true manufacture of them they may have used a lower grade of wood and a much lighter engine. A kit built plane that was built according to the plans usually comes out weighing more then stated on the box. Fly the plane and see how it handles, It will probably be just fine. I test all new planes up high to see if there is a stall or wing loading problem before I try landing. To date I have only had one plane with a stall problem due to weight. It was a prototype ARF and so over weight I was surprised it got off the ground. I liked it so much I gave it away, it was a 30% Extra Patty that wasn't excepted for production by Tower. Had some great features but it was a true pig in the air.