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1966 Honda CB450 1 inch crack on verticle bar of frame

CB160, CB350, CB360, CB450
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bulterier
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Joined: Tue Nov 16, 2010 3:51 pm
Location: San Antonio

1966 Honda CB450 1 inch crack on verticle bar of frame

Post by bulterier » Tue Sep 04, 2012 11:43 pm

I am taking apart my 66 Honda Cb450 so I can perform a full restoration on her.
It was during this time that I saw an unusual crack (about 1 inch long) on the vertical bar part of the frame facing the rear.
I am including a picture of the crack on the bar.

What could have caused this? My plan is to clean that area up and take it to get welded shut.

Any ideas or feedback?

Thanx!
Attachments
photo.JPG
1966 Honda Cb450 Black Bomber
1967 Honda CL77 Scrambler
1967 Honda CB77 Superhawk
1969 Honda S90
1972 Honda CB750

mike in idaho
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Joined: Sun Jan 29, 2012 9:18 pm
Location: orofino, idaho

Post by mike in idaho » Sun Sep 30, 2012 11:19 am

Looks like the tube may have filled with water at one time, then froze. Are there any kind of drain holes on the lower end?
'65 YG1
'65 CB160
'66 CL160
'66 CL77
'78 XS650
'79 GL1000
'69 T100R
'68 TR6
'69 T120
'72 750 Commando
my company car is a Kenworth

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Snakeoil
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Joined: Wed Aug 04, 2010 6:45 pm
Location: Upstate NY

Post by Snakeoil » Sun Sep 30, 2012 6:02 pm

I would agree and say that is exactly what happened.

I'd give the entire bike a good going over for more signs of this.

If you are going to have the bike sandblasted, it migh be worth your while to do a good visual then. You might also slightly pressurize the frame tubes with air and then douse with soapy water and look for bubbles. Might be other cracks that are less obvious. Will mean plugging other holes, but they don't have to be air tight. Just enough so you can put some pressure inside. A bicycle pump works great for this kind of test. Just keeps some pressure on the handle and squirt soapy water all over the frame.

regards,

Rob

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