exhaust down pipes debate

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Sep 5, 2014
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Now oners of early twin from 1960 on in which year did the reduced 1.3/8ths downpipes come on Norton twin As all early twin were 1.5/8ths full bore even the Atlas had full bore pipes So what year does the Reduced pipes come in Answers Please
 
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Apr 20, 2011
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My 1965 Atlas came with 15/8 pipes reducing to 1 3/8 a couple of inches past the ex port.
I think the siamese pipes were the same, so there is no hard and fast rule.
 

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