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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Spring Strengths to be used with Fully Sprung Rear Seats and AVO Coil Over Dampers
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<blockquote data-quote="timetraveller" data-source="post: 157180" data-attributes="member: 456"><p>I will try to answer these questions. AVO would be the best people to answer but failing that try my answers. When I am in any doubt I will mention that in the text.</p><p></p><p><strong><u>'D' Normal.</u></strong> This is intended to replace the original Armstrong units provided on the 'D's. You should note that the front UFM fixing for these dampers is totally different from the 'B's and 'C's so the dampers are longer and not suitable for earlier bikes.</p><p><strong><u>'D' Short.</u></strong> They are intended only for 'D's but aim to reduce the seat height.</p><p><strong><u>'B'/'C' coil over</u></strong>. Intended to provide springing and damping to the rear of 'B's and 'C's. Both damping and spring preload are adjustable. The limited length available forces compromises on the length of springs available and that is what we are trying to understand.</p><p><span style="color: rgb(184, 49, 47)">Now this is where others might be better informed than me</span>. As far as I remember AVO originally made a damper for the rear of 'B' and 'C's. This was intended to be a direct replacement of the original dampers. The total length available caused some problems and so it was decided that if the lower pivot on the damper was displaced from the centre line it would be possible to find a more effective design. On these dampers the tube which acts as the lower pivot is welded to the side of the lower boss giving at least half an inch of extra travel. If you can find pictures then the difference is obvious in that on some the lower tube is as the very bottom of the damper while on the others it is at the side of the lower boss. Any corrections from those better informed than me would be useful and welcome.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 157180, member: 456"] I will try to answer these questions. AVO would be the best people to answer but failing that try my answers. When I am in any doubt I will mention that in the text. [B][U]'D' Normal.[/U][/B] This is intended to replace the original Armstrong units provided on the 'D's. You should note that the front UFM fixing for these dampers is totally different from the 'B's and 'C's so the dampers are longer and not suitable for earlier bikes. [B][U]'D' Short.[/U][/B] They are intended only for 'D's but aim to reduce the seat height. [B][U]'B'/'C' coil over[/U][/B]. Intended to provide springing and damping to the rear of 'B's and 'C's. Both damping and spring preload are adjustable. The limited length available forces compromises on the length of springs available and that is what we are trying to understand. [COLOR=rgb(184, 49, 47)]Now this is where others might be better informed than me[/COLOR]. As far as I remember AVO originally made a damper for the rear of 'B' and 'C's. This was intended to be a direct replacement of the original dampers. The total length available caused some problems and so it was decided that if the lower pivot on the damper was displaced from the centre line it would be possible to find a more effective design. On these dampers the tube which acts as the lower pivot is welded to the side of the lower boss giving at least half an inch of extra travel. If you can find pictures then the difference is obvious in that on some the lower tube is as the very bottom of the damper while on the others it is at the side of the lower boss. Any corrections from those better informed than me would be useful and welcome. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Spring Strengths to be used with Fully Sprung Rear Seats and AVO Coil Over Dampers
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