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I found a hole in my frame

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Craizeehair:
Just over hour and a half on a good run

Bryanj:
I will see if my mig still works, havent used it for a looong time

Toko_Jo:
Very common on that model. The frame has pressed steel sections which act like a funnel if the seat is removed for any time and water somehow finds it's way and collects in the lower frame tubes.

Even seen ultra low mile USA imports with corrosion where mice have nested in that tunnel under the seat and their p*ss finds a path into  the bottom tubes and they rot badly.

It looks like a very poor repair has been done already ...The tube should be continuous .... Maybe someone had already tried to let in new section of metal...I would grind away until you get solid metal then take the decision of MIG welding a  replacement  section of tube or replacing the frame.

I have seen it argued that the lower section is mainly to support the footrest bar as there are bolts onto the engine either side of that section. In my humble view it needs to been done properly though.


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Laverda Dave:
I've seen a couple of 400/4's with bad rot around the side stand pivot area. British bike frames weren't immune from frame rot either.
I hope you get it sorted considering the progress you've made in such a short time and your enthusiasm for it👍

Craizeehair:
Thanks Gents,

Excellent info and appreciate the encouragement.  It will get it sorted one way or another.

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