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Still won't run...
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Jason Curtiss



Joined: 14 Jun 2003
Posts: 667
Location: HOUSTON, TEXAS

PostPosted: Fri Aug 20, 2004 10:31 am    Post subject: Reply with quote

In my mind, the greatest carburetor slide/body wear occurs when the throttle slide is moving against high manifold vacum. This condition sucks and scrapes the slide hard against the body, which literally tears away the surface of the metal. Evidence of this phenomenon can be seen as vertical score marks on the manifold side of any used AMAL carburetor slide.

Now, there is additional wear owing strictly to vibration. However, I feel that this wear is not nearly as severe as the wear incurred when the throttle slide is operated up and down. Installing choke slides may help slightly to resist slide movement from vibration, but I feel the benefits would be miniscule.
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illf8ed



Joined: 30 Dec 2003
Posts: 475

PostPosted: Fri Aug 20, 2004 12:01 pm    Post subject: Amal wear Reply with quote

Hi Jason,

I've run sleeved original 932 concentrics for over 6 years and am not getting much of that wear at the front of the slides. I'm not convinced that vibration doesn't cause considerable wear. The vacuum doesn't affect the jet needles and I will assume vibration wears these out in about 10,000 miles. There were some rubber mount kits in the early 80s to slow down the wear on Amals. The problem with these is it sets the carbs so far rearward you can't use the air filter.

Debbie,

The Amals can be made to work very well, but I believe they will wear quicker than a rubber mounted carb such as Mikuni or Amal Mk2. It really comes down to how you want to use your Commando. I ride less than 3,000 miles per year and when I do ride, I want all the original "snort" a combat can give.
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Jason Curtiss



Joined: 14 Jun 2003
Posts: 667
Location: HOUSTON, TEXAS

PostPosted: Fri Aug 20, 2004 1:21 pm    Post subject: Reply with quote

Hi there illf8ed,

I too run a sleeved AMAL of sorts; it's actually a chrome plated brass slide but similar in concept to the sleeve arrangement. Sleeved or chrome plated brass slides do last longer than the stock pot-metal slides.

And yes, vibration has more of an effect on jet and jet needle wear than slide wear.

Regards,

Jason
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debby



Joined: 15 Apr 2004
Posts: 898
Location: Boulder, CO

PostPosted: Mon Aug 23, 2004 7:17 am    Post subject: Reply with quote

Did you know that AMR place went out of business? (they're the place that bores out the bodies and fits the mikuni-style slides) According to their website they've closed their retail location and plan to reopen as an internet-only operation in a few months. Don't know what their future plans will be regarding the amal repairs...

Debby
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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.