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1961 CB72 Project

Want to keep a Restoration Log? Post it here! You can include photos. Suggested format: One Restoration per Thread; then keep adding your updates to the same thread...
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Seadog
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Post by Seadog » Sat Oct 21, 2017 2:23 pm

You’ve been productive. Nice job on that drill guide bushing and congratulations on working that thing out of the floor peg hanger. I’ve stared at the threaded conical end and just cannot think of what it might have been for. Well done on both tasks.

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G-Man
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Post by G-Man » Sat Oct 21, 2017 4:52 pm

Seadog

Thanks for the kind words. I just needed some small jobs to get back into the swing of being in the workshiop. I'm back on my travels next Tuesday so it wasn't worth getting started on something for my main project, although a rather nice reproduction seat foam arrived in the post today....

G

Seadog wrote:You’ve been productive. Nice job on that drill guide bushing and congratulations on working that thing out of the floor peg hanger. I’ve stared at the threaded conical end and just cannot think of what it might have been for. Well done on both tasks.
Last edited by G-Man on Sat Nov 11, 2017 10:32 am, edited 1 time in total.
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

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G-Man
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Post by G-Man » Sat Nov 11, 2017 10:27 am

Back from my latest US trip and still feeling a bit 'below-par' for any workshop action with dangerous tools. Just before I went away a replacement seat foam turned up so I though I'd better pull out the rather horrible-looking seat for this project.

Image

Early seats had bolted on brackets and attached to a frame that did not have the lugs on the rear frame rails. This leads to them being called 'short' seats but it is really only that the rear brackets are further forward.

The new seat foam looks longer here but that is just perspective. They look pretty well matched to me.

Image

I have also got a couple of vinyl samples as I think the modern replacement covers are just too bright.

I've been putting this off for far too long. Time to get to work on rescuing this seat...

G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

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Seadog
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Posts: 1272
Joined: Thu Dec 25, 2014 9:54 am
Location: Cape Cod, MA

Post by Seadog » Sat Nov 11, 2017 11:18 am

What is all over the seat pan - rust? Peeling paint? Will you treat that first?

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G-Man
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Post by G-Man » Sat Nov 11, 2017 11:49 am

Seadog

Just horrible rust like the rest of the bike. May have to scrap this base and start again but we'll see. Yes, It will all be cleaned up and painted before re-covering.

G
Seadog wrote:What is all over the seat pan - rust? Peeling paint? Will you treat that first?
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

DJM
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Donor rods

Post by DJM » Sat Nov 11, 2017 4:06 pm

Not sure how that would work; I think the whole point of these kits is that the welding rod (actually it's solder) melts at a much lower temperature than the parts you're trying to repair.

If you made the rod from the same material as the parts that wouldn't happen, the donor rod wouldn't melt until it reached the same temperature as the components when the whole lot would go very quickly from a solid to a liquid state, there's a word for that critical point, I think s**t is the word I've heard used!

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G-Man
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Re: Donor rods

Post by G-Man » Sun Nov 12, 2017 3:45 am

DJM

I think you posted to the wrong part of the thread but yes - you are correct. Using the parent metal for the filler, the only option is to use conventional aluminium welding with a TiG or Oxyacetylene set.

G
DJM wrote:Not sure how that would work; I think the whole point of these kits is that the welding rod (actually it's solder) melts at a much lower temperature than the parts you're trying to repair.

If you made the rod from the same material as the parts that wouldn't happen, the donor rod wouldn't melt until it reached the same temperature as the components when the whole lot would go very quickly from a solid to a liquid state, there's a word for that critical point, I think s**t is the word I've heard used!
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

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