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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Timing chain adjustment
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<blockquote data-quote="A_HRD" data-source="post: 103120" data-attributes="member: 49"><p>Tim,</p><p></p><p>Thanks, that would be useful if you can find the info reasonably easily. Certainly, if it is ordinary bicycle chain, there are all sorts of price/strength/manufacturer variants on the web. </p><p></p><p>The A Twin between-centres dimension is a nominal 6" plus scope for a further 1/4" of adjustment either side of that (sprockets are 12T). Lube is via whatever gets by the rear camshaft outer bushing - then it seeps out of a union and pipe at the bottom of the housing. Some people simply grease it liberally every so often and do their best to seal the rear camshaft oil source... Of course, if your name was Neal Videan, you would make the whole thing into a silent belt-drive. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> And if you owned the first production A Twin, you would be using the housing as a route for the one-off 'light spring and washer valve' breather - discontinued by the factory for the rest of the production for reasons unknown. </p><p></p><p>Peter B</p></blockquote><p></p>
[QUOTE="A_HRD, post: 103120, member: 49"] Tim, Thanks, that would be useful if you can find the info reasonably easily. Certainly, if it is ordinary bicycle chain, there are all sorts of price/strength/manufacturer variants on the web. The A Twin between-centres dimension is a nominal 6" plus scope for a further 1/4" of adjustment either side of that (sprockets are 12T). Lube is via whatever gets by the rear camshaft outer bushing - then it seeps out of a union and pipe at the bottom of the housing. Some people simply grease it liberally every so often and do their best to seal the rear camshaft oil source... Of course, if your name was Neal Videan, you would make the whole thing into a silent belt-drive. :) And if you owned the first production A Twin, you would be using the housing as a route for the one-off 'light spring and washer valve' breather - discontinued by the factory for the rest of the production for reasons unknown. Peter B [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Timing chain adjustment
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