cracked welds, lower a-arms

[ryann mx68]

05 400ex stock, starting to hop-up. anyway question is has anyone else had any problems with the welds cracking where the a-arms connect to the frame. raced mx my whole life and just recently started riding quads, 180 lbs, b rider in mx, i ride very aggressive mx style, jumps etc. just want to know if this is a common problem on the 400, i'll add xtra welds to my 4 lower points if ness, or could it be the limits of the suspension, bottoming out?

[K_Fulk]

Never seen the a-arm mounts on the frame crack. Usually the sotck a-arm shock mounts crack, as do the upper shock mount on the frame, around the footpeg bolts, and the upper motor mounts. Are the most likely to crack.

[ryann mx68]

yeah its kinda strange, they are welded on all 4 sides of the mount, but the cracked weld is on the underneath side of the mount, right lower a-arm. last week i overjumped the landing and came down hard, didnt crash or anything, you know in the air its gonna hurt when you land, like i said, i'm just curious if this was common or other frame areas i should keep an eye on. thanks