I have just received and fitted a pair of new Amals to my 1970 S-Type. What a difference, it runs and idles much better. I got these from RGM motors in the UK who I buy most of my stuff from and I have to say I will never mess about rebuilding old Amals again. The only issue to look out for when fitting these carbs is that the inner blanking bosses - where the idle speed screw is on the outer carb body touch when used on a Commando and I note that the original carbs have a flat milled on these inside bosses. It is easy to do with a file, but not so easy when you have already fitted one to the bike and then find out!
New Amal Carbs
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[quoteand I note that the original carbs have a flat milled on these inside bosses. It is easy to do with a file, but not so easy when you have already fitted one to the bike and then find out!][/quote]
And I thought they all came that way. Maybe Amal machined them originally or Norton did. I also find the flange has to be filed or that holds them off the adaptors and can result in a small airleak!
I fitted a pair of replacement bodies from the new tooling a few years ago, with chromed brass slides and new needles, jets etc. but never managed to achieve the nice rock steady idle I witness on some Commandos. Presumably the same castings are used on the new carbs? What I did see was an improvement in fuel comsumption, to the point where a mixture of low and medium speed use was getting me 175 to the Roadster tankful. Mine does hold 12 litres (2.64 Imp gallons though). I have the rising idle with heat which becomes really nasty in heavy traffic. It eventually gets to the point where it won't idle but on cooling down it's fine again.
And I thought they all came that way. Maybe Amal machined them originally or Norton did. I also find the flange has to be filed or that holds them off the adaptors and can result in a small airleak!
I fitted a pair of replacement bodies from the new tooling a few years ago, with chromed brass slides and new needles, jets etc. but never managed to achieve the nice rock steady idle I witness on some Commandos. Presumably the same castings are used on the new carbs? What I did see was an improvement in fuel comsumption, to the point where a mixture of low and medium speed use was getting me 175 to the Roadster tankful. Mine does hold 12 litres (2.64 Imp gallons though). I have the rising idle with heat which becomes really nasty in heavy traffic. It eventually gets to the point where it won't idle but on cooling down it's fine again.
Keith, I'm not sure if these are made using the old casting die or a new tool, they certainly look better than the old carbs and don't have the flaw that looks like a crack on some carb bodies. These also have the new adjustable float and solid anodised slides. I didn't have any issue with the flanges, only the bosses touching and preventing me bolting the second carb on. It idles nicely when warm at about 1,000 RPM and the new carbs got rid of backfiring on the overrun although I also made sure that the bakelite gaskets and manifild flanges were flat before reassembly as I suspected an airleak somewhere in the intake. I have a Pazon ignition fitted, which I think also helps idling stability.
DogT
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I put the anodized slides in my old carbs and it helped a lot, but not perfect. The idle adjustment is very critical with temp and will still wander around a bit, but nearly acceptable. So what's the diff between a set of new carbs and a good sleeving job? Yes, the Pazon Surefire helped mine a lot too although since I had to buy new coils, if I did it again and didn't want the original coil look, I'd go for the Power Arc for almost the same $.
Dave
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Dave
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dave M said:
Are they Amals or Wassels? If Amals I sure hope you got the Premiers.
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dave M said:
The Premiers recently bought (from Burlen?) by Cheshire bloke have had the extra 'Commando' machining done. I think perhaps RGM built up two generic carbs for you?
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Cheshire bloke said:
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The new Amals are pretty nice. Aside from the brass drain screws, as opposed to the old plastic ones, they also come with the new floats with the metal tang holding the inlet plug. Adjusting float height is a bit easier without having to drive the inlet seat up or down in the float bowl.
Filing these areas flat for clearance is necessary. This is both common and required.72westie said:
I am also thinking about taking a step back and slapping the Premiers on.
I have on many occasions made purchases to upgrade and sold my good used items to cover cost. My current set up is good but is quite proprietary to my machine, but with this situation, having it hang around will be ok this time.
pvisseriii, I followed your single flat slide pumper carb modification thread and thought you'd got it dialed in and were happy with it. Are you thinking of switching back because of the original "look" offered by the updated performance of the new premier amals or is it something else?
Yes, my current setup is hard to beat, but you see, I have this sickness. As long as it does not cause an unmanageabilily, I consider it a safe addiction.cjandme said:
You are right about the improvement to these Amals. They deserve a try.
Here is my real problem. Due to the apparent popularity if these, availability is questionable.
Although the (932/26PREM - 932/27PREM) are not in stock, the (932/19Prem - 932/20Prem) or perhaps the (932/29Prem - 932/30Prem) might be. They should cross over nicely with little to no issue.
I already have the manifolds, throttle, cables and KN filter. If it doesn't work out for me, I trust they will move quite easily to a needy soul.
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pvisseriii said:
Need to quote this just incase you try to edit it. :mrgreen:
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pvisseriii said:unmanageably, oops sorry, unmanageabilityswooshdave said:
What are you, the spelling nazi, or was it the phrase in general.
Oh, by the way, it's "in case" not incase. :mrgreen:
Not worried about your or my spelling ability, more like if you try to back out from admitting to your sickness. :mrgreen:
swooshdave said:
I figured as much. The healthy part of my sickness is the fact that i admit and accept it. I am what I am.
Now, how about them Amals. I hope to hear back from Burlen tomorrow to either know if they have others available or if it's just a short delay. I hate to cancel the order but do not want to tie up moneys in limbo.
Well burlen never got back to me so I cancelled the order. Racingnorton is as a reputable ebay seller as I have found. He had/has some sets so I got them from him. I ended up saving money due to the free shipping.
932/300prem and 932/301prem
Here they are all sync'ed up, adjusted and ready to go.
932/300prem and 932/301prem
Here they are all sync'ed up, adjusted and ready to go.
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