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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Large Timing Gear Factory Markings
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<blockquote data-quote="chankly bore" data-source="post: 150856" data-attributes="member: 317"><p>Just for the sake of detail: Mark a stroke on a tooth space of the large idler. Count 30 teeth anti- clockwise and mark that tooth with two dots. Return to the stroke and go clockwise 30 teeth and mark that tooth with one dot, then count a further 11 teeth clockwise and mark the next space with a "B" if you're lucky enough to own a Meteor or Comet. I believe because of the odd number (79) of teeth on the large idler the marks don't line up again for 158 revolutions. I could be wrong there, my memory is poor. The easiest way to understand the error in "Richardson" is to carefully compare the camshaft slot of the rear cylinder on page 115 with the camshaft slot on page 120. IF your camshaft is produced as per original the slot of the camshaft should point up directly between the pushrod tubes, i.e. in a direct line from the large idler centre to the camshaft centre. However, like the folks here say, best to get equal lift at about 4°. The camshaft slot trick does usually produce a fairly close starting point, though. Breather slot points down on a Comet, and ET98 goes INSIDE the cam followers, not outside as "Richardson" says.</p></blockquote><p></p>
[QUOTE="chankly bore, post: 150856, member: 317"] Just for the sake of detail: Mark a stroke on a tooth space of the large idler. Count 30 teeth anti- clockwise and mark that tooth with two dots. Return to the stroke and go clockwise 30 teeth and mark that tooth with one dot, then count a further 11 teeth clockwise and mark the next space with a "B" if you're lucky enough to own a Meteor or Comet. I believe because of the odd number (79) of teeth on the large idler the marks don't line up again for 158 revolutions. I could be wrong there, my memory is poor. The easiest way to understand the error in "Richardson" is to carefully compare the camshaft slot of the rear cylinder on page 115 with the camshaft slot on page 120. IF your camshaft is produced as per original the slot of the camshaft should point up directly between the pushrod tubes, i.e. in a direct line from the large idler centre to the camshaft centre. However, like the folks here say, best to get equal lift at about 4°. The camshaft slot trick does usually produce a fairly close starting point, though. Breather slot points down on a Comet, and ET98 goes INSIDE the cam followers, not outside as "Richardson" says. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Large Timing Gear Factory Markings
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