1969/70 S ride to day

So i love Commando: it always breaks something but anyway it always comes at home happy and glad.
The bikes have few km (less than 50 each) from rebuilding and the silents block was new (and not aftermarket!).
Anyway it went well at 50%; the silents block of the other S have stood, at least for the moment!
I will replace with its 1970 original: definitely will be better!
Ciao
Piero

Typical break point. Need better isolators. It was warm enough here yesterday, but threatened rain. 2 S models, how do you choose?

pierodn said:

The bikes have few km (less than 50 each) from rebuilding and the silents block was new (and not aftermarket!).
Anyway it went well at 50%; the silents block of the other S have stood, at least for the moment!
I will replace with its 1970 original: definitely will be better!

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Try some of these, perhaps?: http://www.ebay.co.uk/itm/171955791988? ... EBIDX%3AIT

L.A.B. said:

pierodn said:

The bikes have few km (less than 50 each) from rebuilding and the silents block was new (and not aftermarket!).
Anyway it went well at 50%; the silents block of the other S have stood, at least for the moment!
I will replace with its 1970 original: definitely will be better!

Click to expand...

Try some of these, perhaps?: http://www.ebay.co.uk/itm/171955791988? ... EBIDX%3AIT

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Hi Les,
i have just bought now the two new silent block you showed me.
But it is not comforting to see that genuine parts are so little valid!
Thank you.
Piero

DogT said:

Typical break point. Need better isolators. It was warm enough here yesterday, but threatened rain. 2 S models, how do you choose?

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Hi Dave,
here today 20 degree but with a strong mistral wind fom N/O.
The 69 is of my friend Guido.
The 70 is mine.
Choosing between the two is impossible, but 69 is one of the first built and this makes her favorite.
Ciao
Piero

pierodn said:

i have just bought now the two new silent block you showed me.

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OK, good, as I expect it would be useful to know if they are more durable than the 'rubber' mounts.

pierodn said:

But it is not comforting to see that genuine parts are so little valid!

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Yes, I agree. Are sure those mounts were not over-stressed in some way?

L.A.B. said:

pierodn said:

i have just bought now the two new silent block you showed me.

Click to expand...

OK, good, as I expect it would be useful to know if they are more durable than the 'rubber' mounts.

pierodn said:

But it is not comforting to see that genuine parts are so little valid!

Click to expand...

Yes, I agree. Are sure those mounts were not over-stressed in some way?

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Hi Les,
The two silent was bought genuine new and had less than 50 km of riding!
They was easy to mount without over stress.
Maybe they have broken to feel me more happy.
The bike wanted to put a strain on my skills as a sailor on which string and knot to use!
Ciao
Piero

Piero, email Matt at cNw and ask for a pair of his stainless spring mounts.

Problem solved. Forever!

Here's an idea if you can understand it, I found it a long time ago, I haven't done it. Mine are still good with over 1000 miles on them.

'I had a problem with my exhaust mount rubbers shearing after low mileage after I mounted a set of "S" pipes on my '70 Roadster. The original design of the rear mount looks too weak to me with just two rubber mounts holding both pipes. I worked up a new mounting system as follows: I used two stud-bolts (I used 2 Norton P/N 06-4688 studs (5/16x24) I had lying around) threaded one each into the mounting bosses on the two mufflers, then installed the flat bracket that holds the two mufflers together, then secured these brackets to the mufflers with backing nuts making a rigid assembly of the two mufflers. I then made a "sandwich" of rubber isolators over the two studs using a combination of Norton tank mounting rubber washers (06-0648) and drilled-out center rubbers from the original rubber mountings. Then fit the ends of the studs through the chrome "L" bracket with more rubber washers on the far side (need smaller OD washers here to fit inside the "U" shape - had to go search the hardware store to find some), then secured with flat washers and self-locking nuts.

This has worked well so far; the two stud bolts provide more strength for vertical shear forces from the weight of the mufflers. I have been careful not to tighten the lock-nuts too tight and not over- compress the rubber "sandwich" as the exhaust system needs some flexibility to vibrate with the engine independently of the frame.

This needs to be tight to keep the support, just not too tight. Hope this helps.'

The mentioned studs are way too long. They almost touch the spokes of the rear wheel when mounted !



I go for the Mini exhaust rubbers.

I had to grind a special tapered washer to get the rubbers aligned with the bracket.
The bosses for the studs are welded in an odd angle to the silencers which are aftermarket from Campells.

I never checked out that 'solution 'I found. Mine fits flat at the rubbers, the problem I have is the upper header pipe could be about a half inch longer, I have trouble getting the silencer to fully fit past the notches in the front of the silencer, so there's a small hole showing there and it lets exhaust out and gets on the panel. I covered it with a piece of beer can. The whole exhaust system takes a bit of jiggling to get it to fit right, I even resorted to bending one of the header pipes away from the bike a bit. I had to use a long pipe inserted into the header to bend it just a small amount. Lucky I didn't crack the chrome.

DogT said:

I never checked out that 'solution 'I found. Mine fits flat at the rubbers, the problem I have is the upper header pipe could be about a half inch longer, I have trouble getting the silencer to fully fit past the notches in the front of the silencer....

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Au contraire, Monsieur!
My header pipes were too long and I had to cut off a bit. They are also Campells NOS stuff.
Unfortunatly I threw away that cut off piece, or else I could have sent it to you... :lol:

You can get vibration isolators in a few different load ranges. Maybe try some heavier rated ones. The ones I got from Grainger's many years ago are still functioning. I got ones with 1/4 inch studs if I remember correctly.

https://www.grainger.com/category/cylin ... OCK+MOUNTS

Bellissimi! Especially the shot in the orange Mediterranean sunlight. I like the high bars of the dark blue.

I have the same problems with oil tank mounts.
The best mounts are Lord Corporation mounts. They will not separate like the cheap ones.

Hi Chris,
this year we dont have had the winter and fall here,springs weather always.
But we lost the chances to ride a lot because the bikes were not ready.
Now we have to use the bikes, no escuses.
More riding than fixing now.
Ciao
Piero

I got my headers from Xanders in Ohio many years ago, who knows where they came from. He's gone now, but they looked and were sized just like my originals except with good chrome and no cracks. I had the same problem with the original headers. Interesting.

What a gorgeous pair of old motorcycles. They make that Triumph in the background look like a stone-age axe.

I have had this same problem on some rubber cush blocks. It showed up very early when I installed it on the bike. You could see the rubber separation after a day sitting, even before i took it for a ride. I sent that stuff back and got the supplier to send me a different batch that was made from a different manufacturer. Some of the stuff out there is real crap. :roll:
Nice bikes Pierodn. I love the colour.
Cheers,
Thomas
CNN

Did you restore both bikes Piero? They are very nice and in very original look. I must come to Gaeta. I have 251,000 air miles and I just sold $5300 worth of antique/collectible guns. So I feel very content at the moment.

CanukNortonNut said:

I have had this same problem on some rubber cush blocks. It showed up very early when I installed it on the bike. You could see the rubber separation after a day sitting, even before i took it for a ride. I sent that stuff back and got the supplier to send me a different batch that was made from a different manufacturer. Some of the stuff out there is real crap. :roll:
Nice bikes Pierodn. I love the colour.
Cheers,
Thomas
CNN

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Hi Thomas tank you.
I am an educated person and I'm not going to say where I bought these parts, but the seller knows what happened!
Ciao
Piero