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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series 'A' Handlebar Levers
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<blockquote data-quote="Tom Gaynor" data-source="post: 2149" data-attributes="member: 4034"><p><strong>Threads for pre-war levers</strong></p><p></p><p>Somewhere (I haven't found out where) I read that "all pre-war handlebar levers were secured by 7/32" BSF cheese head screws". So I bought a die (and a tap as a precaution) from Tracy, and made up some suitable parts for my original 1938 solid brass Rudge levers. They fitted perfectly. </p><p>Since I now had the taps and dies I used 7/32" on the 1951 Shadow: they fitted. Subsequent discussion in MPH suggested that they should have been 1 BA (which is what KTB says.) 1 BA and 7/32" BSF are almost identical - there's a pitch difference of about 0.001 over an inch, and the diameters are almost identical.</p><p>So, it is possible that pre-war Vin levers also used 7/32" BSF, and highly likely that they'll fit. </p><p>FWIW, the valve lifter on a pre-war (1938) Rudge (7/32" or 1 BA, whatever) appears to be exactly the same part as used on post-war Vincents. Club replacement levers certainly are, because i know the guy who casts them.</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 2149, member: 4034"] [b]Threads for pre-war levers[/b] Somewhere (I haven't found out where) I read that "all pre-war handlebar levers were secured by 7/32" BSF cheese head screws". So I bought a die (and a tap as a precaution) from Tracy, and made up some suitable parts for my original 1938 solid brass Rudge levers. They fitted perfectly. Since I now had the taps and dies I used 7/32" on the 1951 Shadow: they fitted. Subsequent discussion in MPH suggested that they should have been 1 BA (which is what KTB says.) 1 BA and 7/32" BSF are almost identical - there's a pitch difference of about 0.001 over an inch, and the diameters are almost identical. So, it is possible that pre-war Vin levers also used 7/32" BSF, and highly likely that they'll fit. FWIW, the valve lifter on a pre-war (1938) Rudge (7/32" or 1 BA, whatever) appears to be exactly the same part as used on post-war Vincents. Club replacement levers certainly are, because i know the guy who casts them. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series 'A' Handlebar Levers
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