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1954g3ls carburation #755450
11/08/18 7:46 pm
11/08/18 7:46 pm
Joined: Nov 2018
Posts: 3
Essex
R
Robnewman Offline OP
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Robnewman  Offline OP
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R

Joined: Nov 2018
Posts: 3
Essex
I have a 1954 g3ls, it has an AMAL 626 Concentric, think it should have a Monobloc.
What jets and Needle should it have in it.

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Re: 1954g3ls carburation [Re: Robnewman] #755460
11/08/18 9:17 pm
11/08/18 9:17 pm
Joined: Aug 2014
Posts: 1,761
OZ
Triless Offline
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Triless  Offline
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Joined: Aug 2014
Posts: 1,761
OZ
According to my Burlen 10th edition carb settings and spare parts book, a 1954 Matchless G3LS had a 76AV/1ED ( pre Monobloc ), internal bore, 1 1/16 ; mainjet,4/042 - 150; needle jet,4/061-106; needle posn. 3; throttle valve, 6/0524; float chamber,1ED (3 degree); needle, 6/065 ( needle and clip kit, RKC /526 ).
It appears that a Monobloc was fitted from 1955.

Last edited by Triless; 11/08/18 9:24 pm.
Re: 1954g3ls carburation [Re: Triless] #755514
11/09/18 9:59 am
11/09/18 9:59 am
Joined: Nov 2018
Posts: 3
Essex
R
Robnewman Offline OP
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Robnewman  Offline OP
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Joined: Nov 2018
Posts: 3
Essex
Thank you for the comprehensive information
Can you advise how the Concentric that has been fitted to this bike should be jetted and needles.
It's as it was when I bought it last year
Any advise would be aporeciated

Re: 1954g3ls carburation [Re: Robnewman] #755515
11/09/18 10:26 am
11/09/18 10:26 am
Joined: Aug 2014
Posts: 1,761
OZ
Triless Offline
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Triless  Offline
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Posts: 1,761
OZ
Sorry, Rob, I can't advise on this as my experience with a '53 G3LS was with the pre Monobloc carb !

Re: 1954g3ls carburation [Re: Robnewman] #755606
11/10/18 1:54 am
11/10/18 1:54 am
Joined: Aug 2001
Posts: 2,341
Oztralia
R
Rohan Offline
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Rohan  Offline
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Posts: 2,341
Oztralia
Its pretty common to find concentrics substituted for earlier type carbs.
But rare to find any jetting recommendations for them.

Does it run OK with it as is ?
And do you know what is currently in it, jetting wise.

Re: 1954g3ls carburation [Re: Rohan] #755636
11/10/18 1:12 pm
11/10/18 1:12 pm
Joined: Nov 2018
Posts: 3
Essex
R
Robnewman Offline OP
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Robnewman  Offline OP
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Joined: Nov 2018
Posts: 3
Essex
Hi, firstly I've not ridden the bike much, it's a difficult Starter, think I need to strip and clean the carb first and see where I go from there.
Positive thing is that I have a good spark


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