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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing
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<blockquote data-quote="lee_812d" data-source="post: 168353" data-attributes="member: 5136"><p>As I have nothing better to do I made a simple spreadsheet of the alignment of the large idler mark to the half time pinion per revolution (basically the remainder each time when the HT has 48 teeth and the idler 79). As we know it takes 79 turns to get back to the start. To get 1 tooth out either way occurs after 28 and 51 turns (at 51 turns the cam will be 180 degrees out as well). So after either 28 or 51 turns from 1 tooth out, the idler and HT will be aligned but as the cam advances by the same number of teeth that will now be 1 tooth out from its markings as it started aligned.</p><p>That is probably not much help apart from to say that the marks won't necessarily line up however many times it is turned.</p><p></p><p></p><p><strong>Corrected version</strong> (thanks to chankly bore's post below)</p><p>Based on the remainder each time when the HT has 24 teeth, cam 48 and the idler 79. It takes 79 turns to get the HT back to the start and 158 for the cam. To get 1 tooth out either way on the HT occurs after 23 and 56 turns (the cam is 1 tooth out at 28 and 51 turns of the cam).</p></blockquote><p></p>
[QUOTE="lee_812d, post: 168353, member: 5136"] As I have nothing better to do I made a simple spreadsheet of the alignment of the large idler mark to the half time pinion per revolution (basically the remainder each time when the HT has 48 teeth and the idler 79). As we know it takes 79 turns to get back to the start. To get 1 tooth out either way occurs after 28 and 51 turns (at 51 turns the cam will be 180 degrees out as well). So after either 28 or 51 turns from 1 tooth out, the idler and HT will be aligned but as the cam advances by the same number of teeth that will now be 1 tooth out from its markings as it started aligned. That is probably not much help apart from to say that the marks won't necessarily line up however many times it is turned. [B]Corrected version[/B] (thanks to chankly bore's post below) Based on the remainder each time when the HT has 24 teeth, cam 48 and the idler 79. It takes 79 turns to get the HT back to the start and 158 for the cam. To get 1 tooth out either way on the HT occurs after 23 and 56 turns (the cam is 1 tooth out at 28 and 51 turns of the cam). [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing
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