in 4 yrs of racing mx weakest point are the shock mounts need to be gusseted ,both tubes around where sub frame mounts to frame, sub frame itself especially silencer side,and like wrwagon said upper motor mont exaust side tig or mig are 100 time cleaner than arc ,when welding aluminum needs to be clean and the right amperage so important ,mind you i'm an A rider so normal trail riding does not require gusseting need to do your own work dont realy make gusseting kits for rap ,but you ride hard and you will need some especially if you run extended rims or crazy enough to jump with lowering kits!just regusseted frame this last race season and repainted and mid season case 70footer out of a corner in practice that nobody was doing trying to get advantage for the quadolypics and cased it bammm! 4 cracks in frame 1 sub,2 around main frame where sub frame connects and 1 on motor mount!