Amal Emulsion/ splash jet/ main air correction jet ~

Joined
May 22, 2004
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Blokes / Ladies HELP!!
I have got myself involved in a long winded bun fight over the brass pressed emulsion jet in the body of the Amal 932 fitted on my Commando !

I firstly called it a Splash jet and I am not sure whether some one on site here designated this title ~

The point being the whole argument has centred around whether :

A; First some even argue ~ Is this a 'real ' fitting or is Stuart just woffling on !? ~
Yes of course it is ! (Although several ardent stirrers still refuse to accept this!)

B: Is this a listed or even available separate spare part? Not proven ~ no carb listing shows the inserted jet!

C: I argue that the 850 Commando requires a 'bevelled ' or angled 'splash' ~ emulsion jet to avoid a flat spot in mid range!

(Here I am more up against the claim that this BS , and this jet is exclusive to Two strokes!!! :shock: )

D: The "flat" ~ non bevelled splash jet carb is not exclusive to Combat 750s ~ when speaking exclusively Commandos ~ and it is interchangeable with my 850 ` (with correct jetting of course. )

The Trident Amal/s have the flat jet !

In fact this arguement is now dragging into four pages.. :shock: :shock:

http://www.classicbike.net/phpbb/viewto ... sc&start=0

So knight of honour don the armour and unsheath your weapons !! :wink: :twisted: :D
 
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Your link is not working for me, so apologies if I'm repeating something that's already been said.

I queried this with Amals years ago and it seems that all Commandos with the black bucket air filter should have the cut-away spray tube and most importantly, the correct, longer needle which is identified by 4 light grooves above the clip grooves.

The black filter was only fitted to Mk1A and Mk2A 850s, + the Mk111 so presumably the US model Mk1 and 2s did not have the cut-aways.

The non-cutaway tube runs with a shorter needle with two light grooves as identification.

I have found that the early air filter can be run quite happily with the cutaway tubes but it does mean raising the needles IIRC The important thing is to use the appropriate needles and tubes as a pair.

I have never seen the part listed seperately but they're easy enough to tap out of an old body.
 

L.A.B.

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Stuart SS said:
I argue that the 850 Commando requires a 'bevelled ' or angled 'splash' ~ emulsion jet to avoid a flat spot in mid range!

I thought that it was (fairly?) well known that late Comandos had cutaway type spray tubes (or choke tubes), see info on the NOC website:
http://www.nortonownersclub.org/
>Technical>Commando>Carburettors~Settings.

Stuart SS said:
Is this a listed or even available separate spare part? Not proven ~ no carb listing shows the inserted jet!

Has anybody looked on the Hitchcock's website Amal list?: http://www.hitchcocksmotorcycles.com/
>Amal Mk1 Concentric
900 series 28-32mm


shown as item 38
Spray tube
4/S = Part AM622/074
2/S = Part AM622/075

------------------------------------------------
Update

Quote from the April 73 edition of 'Motorcycle Sport' technical appraisal of "The New Big Norton" reprinted in the book 'Norton Commando Gold Portfolio'

Item 19 of 26:

"Carburettor ticklers are now of "water-proof" Spanish type. The float bowls are fitted with drain plugs. Cutaway spray tubes are fitted"

(Although the specifications would seem to refer to a MkI not IA!)

There seems to be three different types of spray tube :Cylindrical, Stepped and Angled!

------------------------------
I have also found another part reference (928/107) for the 850 spray/choke tube from the RGM 'Special Products Brochure Number 2' (also contains a lot of technical and tuning info).
 
Joined
May 22, 2004
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Thanks LAB & 79

Some solid information.

Inters tingly the debate on www.classicbike.net is despite its 3-4 pages is painfully obviously lacking in any substantial knowledge base !! Purely circumstantial ? So it seems there is few that really know the full details of this Spray tube and its 'character/s"
 
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