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Main and needle jet for 276 carb fitted to my 1951 ES2

Submitted by grant_macneill1 on Fri, 11/06/2021
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The various copies of my Norton manuals state that the main jet is #160 but there is no mention of what the needle jet should be ?   

 AMAL offers 7 different needle jet options for the 276 carb

Could anybody kindly advise what the "stock" factory needle-jet would have been please

Thanks,

Grant in Toronto

Submitted by david_cooper on Fri, 11/06/2021

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Grant...as you have found, the size is not listed anywhere. My 276 has no marks on the needle jet. Almost always the size is .106. 

Thanks David,  that was very helpful

I wonder if you can also advise me on the correct throttle slide.  There are 6 incremental variations in cutaway on the AMAL slides from the #2 to #6 versions.   I may want to step up or step down a cutaway as this process proceeds.   Never messed with the cutaway but by reducing the cutaway, I understand that I can make lower throttle zone more rich which I may need to do.

Do you have an idea what the stock "factory" cutaway number would have been ?  My Haycraft "book of the Norton" says the "Throttle Valve" is 6/4 but that does not match up with current terminology on the AMAL web site. 

thanks again,

Grant MacNeill, 

Twelfth Fret Guitar Shop, Toronto

Submitted by ian_cordes on Fri, 11/06/2021

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According to my Amal book it concurs with David; .106 needle jet. As you say, 160 main jet, needle position 3, 6/0524 throttle valve.

Submitted by robert_tuck on Fri, 11/06/2021

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The needle jet has a reference    4/061-106  ,don't know if it makes a difference.

Submitted by david_cooper on Mon, 14/06/2021

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The 6/ is the designation of the card. A 6/4 is just slide number 4.

If you are setting up a non standard carb from scratch, you can start with a low number cutaway and progressively file it away. But with a standard setup there should be no need. And filed slides will annoy you in the future.

 

Thanks David.  I have no intention of messing with the slide but wanted to verify that it is the correct one.  So...#4 slide it is.  Thanks.  I'll give the slide another careful look and probably find a number stamped into it.  If it is #4 or  has the current AMAL part number stamping 6/0524 then I won't worry and for the moment, focus on all the other variables to ensure that I have the correct jets

very helpful

Regards,

Grant

Submitted by ian_soady on Tue, 15/06/2021

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.. of course but my 1952 ES2 has a monobloc fitted and spat back a lot on opening the throttle. A change to the next richer slide (can't quite remember ATM but think it was 4 to 3.5) cured it.

 



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