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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Concentric Modification
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<blockquote data-quote="Nigel Spaxman" data-source="post: 68635" data-attributes="member: 2907"><p>I have a Norton 850 that I run with a single carburetor. The carburetor is an Amal 1038. It has many of the same parts as the 900 series Amal including the float bowl and the float, as well as the needle jet and needle. I have that carburetor working really well on the Norton. It has to flow a lot of fuel with only one small float bowl supplying the 828cc Norton. That carburetor will not flow enough gas for the 850 without the modified float bowl. I tried it and the float bowl would drain in about two seconds and run lean until I modified it. Mine is modified with two extra holes where the slot is shown in this diagram from BSA. Many people find that with modified Nortons they have the same problem even with dual carburetors. John McDougal told me the reason he had Monoblocks on his 750 Norton race bike was because they flow more. Later on he found out about the modification of the 900 series carbs, but he prefered the Monoblocks anyway. I think that a Vincent with 930s or 932s might need to have this modification if the twist grip is going to be opened all the way for any length of time.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 68635, member: 2907"] I have a Norton 850 that I run with a single carburetor. The carburetor is an Amal 1038. It has many of the same parts as the 900 series Amal including the float bowl and the float, as well as the needle jet and needle. I have that carburetor working really well on the Norton. It has to flow a lot of fuel with only one small float bowl supplying the 828cc Norton. That carburetor will not flow enough gas for the 850 without the modified float bowl. I tried it and the float bowl would drain in about two seconds and run lean until I modified it. Mine is modified with two extra holes where the slot is shown in this diagram from BSA. Many people find that with modified Nortons they have the same problem even with dual carburetors. John McDougal told me the reason he had Monoblocks on his 750 Norton race bike was because they flow more. Later on he found out about the modification of the 900 series carbs, but he prefered the Monoblocks anyway. I think that a Vincent with 930s or 932s might need to have this modification if the twist grip is going to be opened all the way for any length of time. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Concentric Modification
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