amal premiers dont fit

toppy · Mar 29, 2013

Hi I bought a pair of new amal premiers as they would fit straight on and were better than copies or trying to fit other types or makes of carb. Easy I thought just keep it standard an life will be simple WRONG. The old carb have small flat on inside edge of mounting flannel an blank part of casting that is used for throttle stop screw onimproved ones don't and so hit each other before sealing to the head (rh10)
has anyone else found this? Do I have to file my NEW carb?? Its holiday weekend so have to wait to contact amal.
thanks for reading this Poppy

DogT · Mar 29, 2013

I'm sure I read here someone else had this issue.

Dave
69S

BillT · Mar 29, 2013

Yeah, Amals aren't just built for Nortons, and the Norton setup is rather close, compared to say a Triumph Bonneville.

On My '67 G15, which I believe was the first year switch from monblocs to concentrics, the carbs appear to have been filed down by hand at the blanks, as one is more filed down than the other. I'm sure this was done at Plumstead rather than by Amal.

G15 uses the 750 Atlas motor, so very similar head to a Commando.

cjandme · Mar 29, 2013

DogT said:
I'm sure I read here someone else had this issue.Dave 69S

+1 I remember reading about that one too, I'm looking to get a pair for myself and so took note. Should be an easy fix toppy

and the new idle circuit should alone should make them worth it, add in the better alloy, stay up floats and annodized slides, and I'm pretty much in, they just "look" right too IMHO

Cheshire bloke · Mar 29, 2013

Here's my new Amal Premiers for my Mk3from Amal themselves. They have the flats machined on each of the carbs, you can only see the right hand carb flats in the picture, so if you buy a pair from Amal this is how they will be supplied, you need to be careful and specify the correct model number for the jetting etc.

Oh, you might have noticed the single spigot banjo's, I rang up Amal and they very quickly sent the correct 180 double banjo's free of charge, very good service.

Hope this helps
CB

pete.v · Mar 29, 2013

Cheshire bloke said:
Here's my new Amal Premiers for my Mk3from Amal themselves. They have the flats machined on each of the carbs, you can only see the right hand carb flats in the picture, so if you buy a pair from Amal this is how they will be supplied, you need to be careful and specify the correct model number for the jetting etc.

Oh, you might have noticed the single spigot banjo's, I rang up Amal and they very quickly sent the correct 180 double banjo's free of charge, very good service.

Hope this helps
CB

+1 Grind the little flats on the insides where they meet. Totally common and necessary You'll be fine.

toppy · Mar 29, 2013

I thought I would have to but you would not think you would need to that's all it not like they are dodgie copies made in somewhere completely unheard of.
Also they make a selling point of the fact the bodies surfaces are passivated which as I understand it is only a surface treatment like annodizing so will be lost in the areas filed away

L.A.B. · Mar 29, 2013

toppy said:
I thought I would have to but you would not think you would need to that's all it not like they are dodgie copies made in somewhere completely unheard of.
Also they make a selling point of the fact the bodies surfaces are passivated which as I understand it is only a surface treatment like annodizing so will be lost in the areas filed away

"alan clarke2's" reply on the NOC forum may hold the key to this, as it would seem only carbs supplied to Mk3 spec. come with the machined flats.
Perhaps Burlen are unaware that all Commando Amal Mk1 carbs need the machined flats?

http://www.nortonownersclub.org/noc-cha ... 53994/view

I asked the supplier about this and they told me that If I had ordered carbs for the Mk3 Commando they come with the bit machined off

BillT · Mar 29, 2013

L.A.B. said:
Perhaps Burlen are unaware that all Commando Amal Mk1 carbs need the machined flats?

Not just Commandos. Any mid-67 on Norton (or Norton-engined Matchless/AJS) has this issue.

kingdaddyo · Mar 30, 2013

I have also seen the manifolds which have been ground or machined for the amals. The dunstall types also have a flat machined into them to accommodate. When I first saw it I thought somebody had buggered it up but upon closer inspection realized it had to be that way in order to fit.

toppy · Mar 30, 2013

Looking at the picture of Cheasure Blokes carbs it is clear that the flats have been machined on after the body has been passivated maybe even after whole carbs was assembled. I have had similar replies from Norton Owners Club website so it looks like time to get the files out.

kevbo82 · Mar 30, 2013

i was looking into buying a set, i saw some for sale on ebay and the seller made it very clear, that they needed to be filed down for norton twins, so must be pretty common. I wonder if back in the 70's norton did this, or AMAL shipped them to norton ready to go

ebsbury · Apr 2, 2013

Amal build two classes of Mark 1 carburetter - generic and to specification. Generic carburetters are built with standard castings and are intended for purchase by dealers who re-jet them as required for individual customers. The most common four stroke versions can be identified by the /300 and /301 suffixes on the ID pads. If you have a pair of 930 or 932 /300 and /301 the flanges will not be modified.

Carburetters built using the original Amal specification information incorporate the special features of the original carburetters including the machined flanges and throttle stop bosses of the Commando carburetters. They will be stamped with the correct Commano speciifcation numbers. The 850 carburetters will also have the correct spray tubes and needles.

L.A.B. · Apr 2, 2013

ebsbury said:
Amal build two classes of Mark 1 carburetter - generic and to specification. Generic carburetters are built with standard castings and are intended for purchase by dealers who re-jet them as required for individual customers. The most common four stroke versions can be identified by the /300 and /301 suffixes on the ID pads. If you have a pair of 930 or 932 /300 and /301 the flanges will not be modified.

Carburetters built using the original Amal specification information incorporate the special features of the original carburetters including the machined flanges and throttle stop bosses of the Commando carburetters. They will be stamped with the correct Commano speciifcation numbers. The 850 carburetters will also have the correct spray tubes and needles.

Did this information come directly from Burlen?

ebsbury · Apr 2, 2013

Yes, This is how they currently build Mark 1 carbs and Mark 1 Premiers.

AntrimMan · Apr 2, 2013

quote: The 850 carburetters will also have the correct spray tubes and needles.

So perhaps the OP should also consider this. The needles and spay tubes may not be per the application.
Food for thought.

It would be nice to see a photo down the throat of the premiers pictured above too, to have a peek at the spray tubes.
All the Best.

swooshdave · Apr 2, 2013

If you look at the original Commando Amals that funny area is cast not cut off.

Cheshire bloke · Apr 2, 2013

Here's a piccy of the new premier (the one at top) compared to the original factory fitted.
You can see the cut away spray tube, all excellent quality.

This is the box one of them came in, it shows the part numbers, jets etc. For a 850 MK3.

Just been out to a freezing cold garage for these pics brrrrr!! will spring ever arrive??

CB

kevbo82 · Apr 2, 2013

Cheshire bloke said:
Here's a piccy of the new premier (the one at top) compared to the original factory fitted.
You can see the cut away spray tube, all excellent quality.

This is the box one of them came in, it shows the part numbers, jets etc. For a 850 MK3.

Just been out to a freezing cold garage for these pics brrrrr!! will spring ever arrive??

CB

and yours came filed down to fit the norton twin?

AntrimMan · Apr 3, 2013

hey C B , thanks for the pics.
There is no mention of the main needle or spray tube on the label.
I suppose Burlen knows that their 932/32 equates to stepped tube mated with the 4 groove needle, milled flats, proper hand, etc.
Why do you have the new carb apart? Was it just the little boy in you, ha-ha?
Thanks again for the pics.
All the Best.

amal premiers dont fit

toppy

DogT

BillT

cjandme

Cheshire bloke

pete.v

toppy

L.A.B.

Moderator

BillT

kingdaddyo

toppy

kevbo82

ebsbury

L.A.B.

Moderator

ebsbury

AntrimMan

swooshdave

Cheshire bloke

kevbo82

AntrimMan

Similar threads