1961 CB72 ProjectNow 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. 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. 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..... 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. 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 Re: Top speedGordon
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
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160 '66 Matchless 350 '67 CL77 '67 S90 '77 CB400F
shocksGraham, 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..... Re: shocksAlan
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
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160 '66 Matchless 350 '67 CL77 '67 S90 '77 CB400F
LM
That sounds great! I have sent you a PM. 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 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. 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..... And this is where it began. Quite a transformation, I think. 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. I also managed to get a little bit more paint on the fenders on what must be the last painting day of 2014. 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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