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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
AVO coil overs..
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<blockquote data-quote="timetraveller" data-source="post: 145537" data-attributes="member: 456"><p>By coincidence I was discussing this yesterday at the John Lumley Pie and Pint meeting of the North Kent section. From my understanding the Spares Company has thought about providing supports but this has not happened yet. It is not a series 'D' style support. As Comet rider above says most people make their own but I do have a design. I don't have ACAD on this PC but I could draw something up tomorrow. I will try to describe what I see as a solution. One can do just as CR describes but the problem then is that a lot of strain is placed on the two supports at the front of the standard seat and occasionally one will see them starting to give way as the seat tries to move backwards. One solution is to weld another piece of tube from the front of the main support forwards where it can be supported either in the sidecar tube or the front of the seat support stud. Vibrac has a very neat version of this on his Comet wherein he has a rose joint at the front of each of the extra forward facing struts, which are only in tension.</p><p></p><p>What I was trying to describe yesterday is an alternative to this forward tensioning tubes. If one looks at the standard pillion footrest plates there are several holes at the rear end of these. The upper ones are there to support the pillion footrest and the lower ones seem not to be used. Perhaps not all bikes have the lower holes but if they do, or you are prepared to make the holes then there is a ready solution. Imagine a flat piece of steel bar which will bolt to the vertically separated two rear holes. Now weld or braze the support tube which goes up to the rear of the seat to the top of that steel bar. If that steel bar and the weld/braze are strong enough then the support tube for the rear of the seat cannot pivot backwards. Instead any turning force is passed to the pillion footrest plate.</p><p>If you do not still have the original pillion footrest plates but instead have a Dave Hills centre stand then the plates are different but the bike we were looking at yesterday had two vertically seperated holes about an inch forwards of the rear or the plates. Those holes could be used but the design of the plate/support tube combination would have to be slightly different.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 145537, member: 456"] By coincidence I was discussing this yesterday at the John Lumley Pie and Pint meeting of the North Kent section. From my understanding the Spares Company has thought about providing supports but this has not happened yet. It is not a series 'D' style support. As Comet rider above says most people make their own but I do have a design. I don't have ACAD on this PC but I could draw something up tomorrow. I will try to describe what I see as a solution. One can do just as CR describes but the problem then is that a lot of strain is placed on the two supports at the front of the standard seat and occasionally one will see them starting to give way as the seat tries to move backwards. One solution is to weld another piece of tube from the front of the main support forwards where it can be supported either in the sidecar tube or the front of the seat support stud. Vibrac has a very neat version of this on his Comet wherein he has a rose joint at the front of each of the extra forward facing struts, which are only in tension. What I was trying to describe yesterday is an alternative to this forward tensioning tubes. If one looks at the standard pillion footrest plates there are several holes at the rear end of these. The upper ones are there to support the pillion footrest and the lower ones seem not to be used. Perhaps not all bikes have the lower holes but if they do, or you are prepared to make the holes then there is a ready solution. Imagine a flat piece of steel bar which will bolt to the vertically separated two rear holes. Now weld or braze the support tube which goes up to the rear of the seat to the top of that steel bar. If that steel bar and the weld/braze are strong enough then the support tube for the rear of the seat cannot pivot backwards. Instead any turning force is passed to the pillion footrest plate. If you do not still have the original pillion footrest plates but instead have a Dave Hills centre stand then the plates are different but the bike we were looking at yesterday had two vertically seperated holes about an inch forwards of the rear or the plates. Those holes could be used but the design of the plate/support tube combination would have to be slightly different. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
AVO coil overs..
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