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Down Under 1975 CB400F Restoration Project

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Sprocket:
Holy (holey?) crap that's a big hole!

Nurse Julie:
Blimey.....NOT an insignificant hole. You may find that when you have the frame blasted, it may resemble a tea bag, ie, lots of holes. Suggest having it blasted first to see what you are working with before doing a fix on that hole.

Andych:
I am also on the lookout for another frame as well... Maybe my next step will be to grind away the bird droppings that resemble someone trying to weld on the outside so I can figure out what they were trying to do.
The bottom tube seems to be solid forward of the poorly welded on patch and side stand bracket so I am hoping that some of the tube is still intact to enable a repair... at least I can gringd that part off without removing the engine and make my decisions based on what I find.

Andych:
I have found another frame that has been butchered up for use as a race bike but the bottom rails are good and the best news is it is A$60 so I will pick it up in the next few weeks (it is about 400km away but on my travel route for work).
That should make for a much better repair than just welding a patch on.

Bryanj:
If that is by the sidestand lug seems to be cropping up regularly on the 400, must be a stress point

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