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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="macvette" data-source="post: 75545" data-attributes="member: 262"><p>My D speedo was refurbished when I rebuilt the bike. This involved measuring the distance covered by one revolution of the front wheel under load and noting the direction of rotation and no of turns of the speedo drive on the front wheel for the guy working on the speedo. He then calibrated the chronometric using this info. My understanding ( limited), is that this is done by adding or subtracting weight in the form of washers to a rotating part of the speedo to speed it up or slow it down as necessary.</p><p>He also recalibrated a speedo I found for my 1938 Empire Star ( it was originally supplied without since they were not compulsory at that time). This would imply that the speedos can be recalibrated to cover 19" (series D) to 21 " (Empy).</p><p>Open series D speedos are different from series C in that they require a right angle drive gear box on the back because of being mounted in the head light.</p><p>Road testing against my friends 2yr old BMW 1200 RT at a steady 70 and 80 mph shows agreement within 1 to 2 mph so it's good enough for me. Don't ask what BMW speedo error is , I don't know</p></blockquote><p></p>
[QUOTE="macvette, post: 75545, member: 262"] My D speedo was refurbished when I rebuilt the bike. This involved measuring the distance covered by one revolution of the front wheel under load and noting the direction of rotation and no of turns of the speedo drive on the front wheel for the guy working on the speedo. He then calibrated the chronometric using this info. My understanding ( limited), is that this is done by adding or subtracting weight in the form of washers to a rotating part of the speedo to speed it up or slow it down as necessary. He also recalibrated a speedo I found for my 1938 Empire Star ( it was originally supplied without since they were not compulsory at that time). This would imply that the speedos can be recalibrated to cover 19" (series D) to 21 " (Empy). Open series D speedos are different from series C in that they require a right angle drive gear box on the back because of being mounted in the head light. Road testing against my friends 2yr old BMW 1200 RT at a steady 70 and 80 mph shows agreement within 1 to 2 mph so it's good enough for me. Don't ask what BMW speedo error is , I don't know [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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