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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Chain Adjuster - Adjustment Criteria
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<blockquote data-quote="Prosper Keating" data-source="post: 8392" data-attributes="member: 1376"><p>Indeed. With, say, pre-unit BSAs and Triumphs, the drill is to set the tension by pushing the gearbox forwards with the adjuster(s) (My old '61 Bonnie had twin adjusters) so that the latter hold it under tension against the pull from the rear chain. The adjuster physically pushes the gearbox or, rather, the upper mounting stud forwards. In other words, you adjust the chain up tight and then slacken it slowly until you arrive at the correct slack. The adjuster, mounting stud and gearbox are now in the right position to obviate rearward creep under motive power.</p><p></p><p>The same effect is achieved on a Comet by pushing the gearbox forwards with the front adjuster. The pull from the rear chain will put the <em>front</em> adjuster under tension against the lower mounting stud. The rear adjuster simply acts as a steady and would not be able to counter any pull from the rear chain. Being bass-ackwards or upside-down, you see, it's, um, a bit different. The good news for Charlie is that even if he ends up howling at the moon after a dozen failed tries, once he gets it right, it shan't go out of adjustment for ages! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>PK</p></blockquote><p></p>
[QUOTE="Prosper Keating, post: 8392, member: 1376"] Indeed. With, say, pre-unit BSAs and Triumphs, the drill is to set the tension by pushing the gearbox forwards with the adjuster(s) (My old '61 Bonnie had twin adjusters) so that the latter hold it under tension against the pull from the rear chain. The adjuster physically pushes the gearbox or, rather, the upper mounting stud forwards. In other words, you adjust the chain up tight and then slacken it slowly until you arrive at the correct slack. The adjuster, mounting stud and gearbox are now in the right position to obviate rearward creep under motive power. The same effect is achieved on a Comet by pushing the gearbox forwards with the front adjuster. The pull from the rear chain will put the [i]front[/i] adjuster under tension against the lower mounting stud. The rear adjuster simply acts as a steady and would not be able to counter any pull from the rear chain. Being bass-ackwards or upside-down, you see, it's, um, a bit different. The good news for Charlie is that even if he ends up howling at the moon after a dozen failed tries, once he gets it right, it shan't go out of adjustment for ages! :D PK [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Chain Adjuster - Adjustment Criteria
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