When Adam supplied my last kart a mk2 7 kart for my lad (he is a youngster and a lightweight) he used the method that Lard mentioned, two chassis clamps either side o the seat with bolts threaded in , I raided the local church roof and melted lead down into moulds, I have 7kg on each side , 2x4kg weights on the back of the seat but higher up ( melted lead and moulded into a chinese takeaway dish)and a if necessary (depending on how the scales feel) we have 1kg on the side of the seat and this seems to work well for him, i cant catch the little sh*t anyway lol.
down side to all this is lifting the kart its a 3 man operation to load it in the van or you end up like Buster Gonnad ! so the last month or so Ive been feeding him double portions and we have taken 2kg off which is a step in the right direction.
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