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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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G-Man
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Post by G-Man » Sat Oct 11, 2014 1:34 pm

Now that the chroming is done and the covers are painted I had no excuses to avoid putting some shocks together. The ones in the pictures are Alan Curtis's because we are meeting up at next week's Stafford Classic Bike show and I wanted to hand them over. Mine will be next and I need to do a bit of extra head scratching as I'm not sure whether to build them with the delicate aluminium covers or whether to make something a little more durable.

The insides of Alan's shocks were completely full of dirt and rust and the damper rods were in a terrible state. The only choice was to assemble them with a combination of rod and damper tube which would give the correct stroke without bottoming out. I had to use the damper tubes out of my shocks as Alan's were too far gone and later ones are too long. I will machine some later ones down for my dampers when I have time.

Here are the assembled units and the original damper rods.

Image


Because the aluminium lower covers are so thin, I used NOS springs and liberally greased them to reduce any interference.

The original springs (centre) had badly pitted chrome so I had them stripped but the surface was rough and I didn't want to risk it.

Image

I was glad of my shock compressor tool when I reassembled these. The top plate of my tool is faced with leather to avoid scratching the paint.

And here they are nicely covered.....

Image

I'm so glad that we could preserve these as they have that unique "fat L" shaped preload adjuster stop. The top collets and the preload adjuster are both steel so have survived well. The pre-load stop is brazed in place rather than spot-welded - another difference from later units.


Image

Aren't those lower covers beautiful? They are paper-thin clear anodised aluminum. These had been removed from a 1961 bike which was converted to a racer in the 1960s. Mine are not as nice as these but still usable.

I can breathe again now after performing a delicate assembly job.....

G
Last edited by G-Man on Sat Oct 11, 2014 2:17 pm, 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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Re: Top speed

Post by G-Man » Sat Oct 11, 2014 1:41 pm

Gordon

I wish I could have been there to see his suit flapping in the wind.....

He didn't seem to worry about the SLS front brake either. Probably an advantage in December in UK......

G
GORDON BROWN wrote:Hello

Vince and G-Man, they even tell you that he was 13 1/2 stone and wearing a two piece suit and overboots, I wonder if he was lying flat along the tank and seat Rollie Free style, as recommended in Hondas CB92 ? owners manual for top speed. This was obviously back when men were men and health and safety was not invented of course.

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

alan curtis
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Location: worcester. uk

shocks

Post by alan curtis » Sat Oct 11, 2014 1:53 pm

Graham, shocks is the right word for the condition that they where in, and even more shocked how well you have made them,top marks, many thanks, it would have been the wrong thing to do and put any on this bike, the more correct parts we can turn up the better..glad i could help you with some of your parts... mega thanks...

Gordon, recognise the covers. cheers.....

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G-Man
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Re: shocks

Post by G-Man » Sat Oct 11, 2014 2:23 pm

Alan

Our two bikes were probably built on the same day and likely would have travelled to UK on the same boat in 1961. It will be great to see them together again when they are finished. Its a great help to compare notes and trade parts.

G
alan curtis wrote:Graham, shocks is the right word for the condition that they where in, and even more shocked how well you have made them,top marks, many thanks, it would have been the wrong thing to do and put any on this bike, the more correct parts we can turn up the better..glad i could help you with some of your parts... mega thanks...

Gordon, recognise the covers. cheers.....
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

LOUD MOUSE
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Location: KERRVILLE, TEXAS

Post by LOUD MOUSE » Sat Oct 11, 2014 10:03 pm

I have a 250 head with the 10mm plug holes. ..............lm
G-Man wrote:Jensen

Thanks for the answers!

Still looking for that head.


G

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G-Man
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Post by G-Man » Sun Oct 12, 2014 1:33 am

LM

That sounds great! I have sent you a PM.

G
LOUD MOUSE wrote:I have a 250 head with the 10mm plug holes. ..............lm
G-Man wrote:Jensen

Thanks for the answers!

Still looking for that head.


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

User avatar
G-Man
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Posts: 5678
Joined: Wed Mar 25, 2009 5:17 pm
Location: Derby, UK
Contact:

Post by G-Man » Sun Oct 12, 2014 1:02 pm

Managed to get a bit more time in the workshop today. I was on a roll with Alan's shocks so I though I'd better make some progress on my own.

Luckily I was able to find another suitable set of damper innards but I had to shorten the damper tubes by about 10mm to get them to fit inside the early shocks. I checked that they went together dry then filled each with 45-50mls of SAE15 oil. A bit of loctite flange seal on the nut should keep the oil inside. My lower covers are nowhere near as nice as Alan's but my damper bodies were in much better shape, needing less polishing work at the chrome stage.

Image

And here we have two pairs of early shock absorbers complete with alloy covers. Alan and I have had slightly different color matches done but, judging from some of the bikes on the internet, there is a lot of room for 'interpretation.....

Image

And this is where it began. Quite a transformation, I think.

Image

There was just a little time as the afternoon sun was fading, to get a missing cable guide made up and welded to the front fender.

Image

I also managed to get a little bit more paint on the fenders on what must be the last painting day of 2014.

Image

I'm off on my travels again next week so I will have to park the painting until next year and make a start on the wheels and engine when I return ....

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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