amal slides

britbike220

britbike220

Joined
Aug 6, 2005
Messages
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I thought I read a post recently where someone said they had chrome slides for amal concentrics, but I can't find the post. I'd like to try one on a 928 if possible. Anyone know who had them?
 
Thanks, but I think it was states side. I think shipping from uk would be cost prohibitive for such a common item.
 
britbike220 said:
Thanks, but I think it was states side. I think shipping from uk would be cost prohibitive for such a common item.
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But they're not a common item as far as I'm aware, at least not the chrome plated brass slides?
I don't think Burlen (Amal) has ever managed to successfully produce the chromed brass slides in any great quantity.
Beware of the chrome plated zinc slides which most 'chrome' Amal slides in fact are.
Unless there's a manufacturer of chromed slides in the US then the Surrey Cycles slides are ones to buy.
 
Off track a bit but a friend has a old Royal Enfield that has been completely gone through and only needs the carbs done, dual Amal's and he bought the rebuild kits years ago so I told him to buy new ones cuz it seems things have been improved like float needles etc. Ok the gaskets are ok but what should he replace? I assume a float needle for modern gas, one of the new floats, the O rings @ the air screw & throttle stop. Is that it? His kits are eight years old (that's when the bike was restored but not ridden) I would trash them all but he won't so all new rubber parts is the best I can get him to do!
 
This is a copy of an emil reply i received from amal-

A pair of 930/30 and 930/31 cost £85 each. Shipping to New Zealand costs £25.00.

We have just introduced some new options for the Mark 1 carburetter and for the time being we are giving customers who order carburetters the links to the new parts so you have the option of considering them for your carburetter. If you order and would like any of these options built into your carburetters, let me know and I will get your carburetters modified.

The options are:

Decorative Chrome brass slides: http://www.amalcarb.co.uk/ProductDetail.aspx?id=37425

Hard anodised slides: http://www.amalcarb.co.uk/ProductDetail.aspx?id=37409

“Stay-up” floats: http://www.amalcarb.co.uk/TechnicalDetail.aspx?id=14

As part of a new carburetter Ground hard chromed brass slides costs £19.50 extra, Hard anodised slides cost £17.50 extra, and the “Stay-Up” floats cost £7.50 extra. Decorative chromed brass slides cost £10 extra where the required cutaway is still available.

Kind regards,

Phil Beresford
Technical Sales Co-ordinator

Burlen Fuel Systems Limited - The SU and AMAL Carburetter Companies
 
I ordered one for my carb at the beginning of March. Still not arrived as there is a supply issue.
 
OK, I'm confused. If the slide is made of harder metal (chrome) than the body of the carburetor, hence the bore, won't they wear down the bore of the carburetor faster? I would rather replace the slide occasionally than have to resleeve the bore.
 
montelatici said:
OK, I'm confused. If the slide is made of harder metal (chrome) than the body of the carburetor, hence the bore, won't they wear down the bore of the carburetor faster? I would rather replace the slide occasionally than have to resleeve the bore.
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Chrome, if you hadn't noticed, is relatively smooth. :mrgreen:
 
I think the fact that it isn't two like metals help the slide and bore to remain in tact longer. Like metals tend to gaul or fuse if left together. There is clearance so there isn't really wear as long as you have bronze, chrome, steel, etc along with the pot metal bore.
 
swooshdave said:
montelatici said:
OK, I'm confused. If the slide is made of harder metal (chrome) than the body of the carburetor, hence the bore, won't they wear down the bore of the carburetor faster? I would rather replace the slide occasionally than have to resleeve the bore.
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Chrome, if you hadn't noticed, is relatively smooth. :mrgreen:
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Of course, but being a 2-stroke racer, I know darn well that they don't make chrome pistons and steel bores for a reason. LOL
 
NP...

I contacted them in September... they were out at the time called me two months later to say they had restocked.

They are definitely chromed brass; you can see the brass on the underside.

Good service and always pleasant to talk to on the phone.

Cheers,

- HJ
 
I get my chrome slides from British Cycle Supply.
Believe it or not, the softer body actually wears the harder slide.
This is not unlike a machinists process called lapping where a soft (often copper) expanding mandrel is used to hold abrasive paste. The mandrel is rotated in a harder cylinder to give it a precise finish.
OK, so we don't squirt toothepaste onto our carbs but a certain amount of airborne crud does make its way into the intake and some of it sticks in the carb - to the softer metal which will now wear the harder metal. Check out a modern carb, they are all hard chromed or hard anodized. The hard slides will last a loooong time and IMHO you shouldn't ever wear the carb body out.
Enjoy hard slides, I do.
 
jimonthego said:
I get my chrome slides from British Cycle Supply.
Believe it or not, the softer body actually wears the harder slide.
This is not unlike a machinists process called lapping where a soft (often copper) expanding mandrel is used to hold abrasive paste. The mandrel is rotated in a harder cylinder to give it a precise finish.
OK, so we don't squirt toothepaste onto our carbs but a certain amount of airborne crud does make its way into the intake and some of it sticks in the carb - to the softer metal which will now wear the harder metal. Check out a modern carb, they are all hard chromed or hard anodized. The hard slides will last a loooong time and IMHO you shouldn't ever wear the carb body out.
Enjoy hard slides, I do.
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Ok, so if harder metals get worn by softer metals (and I am skeptical), why do they use chrome cylinders on racing engines rather than the pistons? Do you think it is the heat factor? Anyway, now that you have chrome slides, what happens when you resleeve with chrome or whatever harder material they use? Do you go back to normal slides?
 
montelatici said:
Ok, so if harder metals get worn by softer metals (and I am skeptical), why do they use chrome cylinders on racing engines rather than the pistons? Do you think it is the heat factor? Anyway, now that you have chrome slides, what happens when you resleeve with chrome or whatever harder material they use? Do you go back to normal slides?
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I don't think you are not understanding this. The chrome slides are for a standard bore carb, (stock). Sleeves are done when a carb is worn or one wants to prevent the carb from wearing with stock components. Sleeves are generally done on the slide with a bronze, or stainless steel tube cut to fit and the bore of the carb body is enlarged to fit the new slide with sleeve. There are explanations of the process at the link below. I simply wanted a chrome slide so sleeving could be avoided and I found what I need. Sleeving or chrome slides wlll work hands down better than stock components for seriously long periods of time. I have used sleeves for nearly a decade w/o any wear or issues period. If you are a skeptic try something different you may like the results and slides are cheap.

http://www.amalsleeve.com/page2.html
 
Never had any problems with my original AMALs since I bought my Norton 35+ years ago. Have rebuilt the engine twice, but same carbs and slides only replaced for tuning purposes maybe after the last rebuild 10 years ago. Amals wear out when people over torque the carb falnge and get the carb body out of round, full stop. That's why I am skeptical about all this hocus pocus. By the way, I have forgotten more about Norton mechanical issues than you will ever learn, so keep this "I don't think you get it" crap to yourself.
 
montelatici said:
Never had any problems with my original AMALs since I bought my Norton 35+ years ago. Have rebuilt the engine twice, but same carbs and slides only replaced for tuning purposes maybe after the last rebuild 10 years ago. Amals wear out when people over torque the carb falnge and get the carb body out of round, full stop. That's why I am skeptical about all this hocus pocus. By the way, I have forgotten more about Norton mechanical issues than you will ever learn, so keep this "I don't think you get it" crap to yourself.
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I will speak my mind as I see fit, especially when something has worked for me. It's a shame you have forgotten so much valuable norton knowledge.. :roll:
 
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