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STAINLESS STEEL FASTENERS

 
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Jason Curtiss



Joined: 14 Jun 2003
Posts: 661
Location: HOUSTON, TEXAS

PostPosted: Thu Jul 22, 2004 10:10 am    Post subject: STAINLESS STEEL FASTENERS Reply with quote

I asked the following question a about a year ago and only recieved one response. Since that time, our forum has expanded considerably. So, I thought I would throw the question out one more time in hopes of getting a few more responses.

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Does anyone have any experience using stainless steel head bolts on a 850 Commando?

Stainless steel generally has a lower minimum yield strength as compared to, say, the more common SAE Grade 5 bolt steel. Because of its lower yield strength, the stainless will stretch more than Grade 5 material, given the same make-up torque.

I purchased some stainless head bolts from Raber's Parts Mart and they appear to be of high quality but it's difficult to tell what the yield strength is. So, I am concerned about the bolts stretching, resulting in a leaky head gasket.

Any thoughts will be appreciated.

Jason
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arch



Joined: 22 Jul 2004
Posts: 31

PostPosted: Thu Jul 22, 2004 2:15 pm    Post subject: Reply with quote

I installed a set that I purchased from Norvil.

It's been about 5,000 miles and no trouble yet.

I've check them several times and all seems ok.


Jason, you probably already know about this but I'll tell you anyway.

If your looking for stainless steel fasteners for general use, like fenders and brackets. There's a good place on 18th street and Ella (i think) in Houston. It's called Coastal Fasteners. I'm glad I loaded up before I left houston. Very reasonable prices and a good varitiy.
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Jason Curtiss



Joined: 14 Jun 2003
Posts: 661
Location: HOUSTON, TEXAS

PostPosted: Thu Jul 22, 2004 5:09 pm    Post subject: Reply with quote

Hi Arch,

Thanks for the tip on the stainless steel fasteners!

Jason
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Ron L



Joined: 27 Feb 2004
Posts: 1101
Location: Ohio

PostPosted: Fri Jul 23, 2004 3:22 am    Post subject: Reply with quote

Jason,
I have had both good and bad experience with stainless cylinder head bolts. I pulled the head off a buddy's "S" model a few years back and all four of the outers were badly stretched. These had come from a usually reputable supplier in England. I ran a tap through the holes in the cylinder and they seemed fine, so we replaced them with a set from Stan Smith (Rocky Point Cycles) and they are doing fine today. I have a set on my '68 Fastback motor with no sign of a problem either. However, I do not trust them enough to use on my hi-compression (milled head) 850.

If you use a torque wrench and stick to the factory torque specs you should not have a problem. Use good quality bolts. I can't recommend Stan highly enough and others on this list can tell you the same.

P.S. - I have heard of severe failure of stainless rear axles. These usually have cut threads rather than rolled and under high loads these fracture at the beginning of the threads.
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The Unapproachable Norton Commando

At the end of 1967 the Norton Commando was announced.

The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.

It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.

Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.

It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.

The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.