Norton Commando
Jerrydoe.com  Forum Home  Norton Commando Forum  Photos  [FAQ]  [Search]  [Memberlist]   
 [Profile]  [Check your private messages]  [Register]  [Log in] 
Best value for money carbs - restored Amal MK1 ?
Goto page Previous  1, 2
 
Post new topic   Reply to topic    Norton Commando Forum Index -> Norton Commando Motorcycles.
View previous topic :: View next topic  
Author Message
Ron L



Joined: 27 Feb 2004
Posts: 1151
Location: Ohio

PostPosted: Fri Aug 22, 2008 6:46 am    Post subject: Reply with quote

iusedtolikehondas,

I suspect even NOS concentrics can benefit from sleeving, but typically I look for movement of the slide in the bore and scoring. If I can move the slide laterally noticeably more near the bottom of the bore than at the top, it is a good indication of excessive wear. Boring the body and adding the sleeve trues the bore and reduces the clearance to provide more uniform air flow.
Back to top
2ndchildhood



Joined: 13 Sep 2006
Posts: 14
Location: Northern California

PostPosted: Fri Aug 22, 2008 10:16 am    Post subject: Reply with quote

iusedtolikehondas wrote:

i guess i worded the question wrong, i meant what to look for. but i'm pretty sure mine are fine after looking at them again.


If you have a micrometer and a T-guage, check that the bore is round and has no taper. Similarly for the slide. Amal specifies a clearance of .0035" to .004" between the slide and bore, if it gets to be greater than .006" you might think about sleeving or at least replacing the slide.

If the bore is good, I would strongly recommend getting one of the chromed brass slides that Amal sells (I think britcycle carries them in the US). This will minimize galling and extend the life of the carb.

A note on clearances: Some machinists will tell you that .004" is too sloppy and they can improve the carb by tightening it up. DO NOT DO THIS. It will not improve the carb but it will significantly increase the probability of a stuck slide, resulting in excessive excitement.
Back to top
Per G



Joined: 07 Apr 2008
Posts: 66
Location: Sweden

PostPosted: Fri Aug 22, 2008 10:57 am    Post subject: Reply with quote

2ndchildhood,
Maybe you can use a bit smaller clearence with brass sleeves?
The guy who did mine mentioned that he's doing them tighter then factory new clearence but right now I don't have a number (but I will check!).

One the first few carbs he did many years ago I know there was an issue with sticking sleeves but now it seems to be gone.
With the tight sleeve you get excellent throttle response not only opening up but also when closing the throttle. Sounds very nice indeed Very Happy

Regards,
Per
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Norton Commando Forum Index -> Norton Commando Motorcycles. All times are GMT - 8 Hours
Goto page Previous  1, 2
Page 2 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

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.