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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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<blockquote data-quote="timetraveller" data-source="post: 137978" data-attributes="member: 456"><p>I do not think that you will be able to tell the difference between a Mk I and a Mk III from photographs. The Mk II had a rounder nose and you can probably see the difference if you have photos of a known Mk I and a known MK II. Otherwise, trying to tell the difference from photographs will be more or less impossible. The way the check is to measure the lift of the valves against engine rotation and plot a graph of that. You are clearly a patient man and you will need to be. Mk I cams were fitted to Rapides, Shadows and Comets originally although Shadows might have been fitted with selected cams to give more accurate timing.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 137978, member: 456"] I do not think that you will be able to tell the difference between a Mk I and a Mk III from photographs. The Mk II had a rounder nose and you can probably see the difference if you have photos of a known Mk I and a known MK II. Otherwise, trying to tell the difference from photographs will be more or less impossible. The way the check is to measure the lift of the valves against engine rotation and plot a graph of that. You are clearly a patient man and you will need to be. Mk I cams were fitted to Rapides, Shadows and Comets originally although Shadows might have been fitted with selected cams to give more accurate timing. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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