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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rear shock absorber alignment
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<blockquote data-quote="oexing" data-source="post: 136744" data-attributes="member: 1493"><p>My verdict in this matter is, when you feel the need to have a bigger thread on the damper piston you just fight symptoms but really you should better go for the cause . On any other bike that original thread will be allright . Not so on a Vincent when no give is designed into the damper for non-parallel bores in damper bodies, rfm holes and oil tank through holes for damper bolts. So nobody should be surprised about snapped rods from undetected sideloads as you can expect all sorts of motions in the geometry of rear suspension parts over full stroke. Same goes for dampers on Girdraulics and Bramptons. In some places you can do mods for Rose joints or spherical plastic bushes like from Igus so this will save you from more snapped rods and leaking seals in the damper. Any side loads onto damper rods are no-go definitely, there is no substantial bronce bush inside and in consequence you´d just have to live with short overhaul intervals due to oil leaks from shot seals and fu**d up damper piston. One end of the damper may have no space for spherical bearing properties so at least the other end will get that kind of give for misalignment. </p><p> Also when looking at TT´s photo of the AVO damper with the offset cross tube welded on - not overly brilliant I´d say, the tube should really be on centerline of the piston rod, else you get that dreaded bending load on the rod and wrecked seals in there, and bad for the piston as well. </p><p> Anyway, while having a job to be done on these items you better try best to care for these "side"effects in suspension or you will do same in short time again. As somebody said: Do it right or do it twice . . . .</p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 136744, member: 1493"] My verdict in this matter is, when you feel the need to have a bigger thread on the damper piston you just fight symptoms but really you should better go for the cause . On any other bike that original thread will be allright . Not so on a Vincent when no give is designed into the damper for non-parallel bores in damper bodies, rfm holes and oil tank through holes for damper bolts. So nobody should be surprised about snapped rods from undetected sideloads as you can expect all sorts of motions in the geometry of rear suspension parts over full stroke. Same goes for dampers on Girdraulics and Bramptons. In some places you can do mods for Rose joints or spherical plastic bushes like from Igus so this will save you from more snapped rods and leaking seals in the damper. Any side loads onto damper rods are no-go definitely, there is no substantial bronce bush inside and in consequence you´d just have to live with short overhaul intervals due to oil leaks from shot seals and fu**d up damper piston. One end of the damper may have no space for spherical bearing properties so at least the other end will get that kind of give for misalignment. Also when looking at TT´s photo of the AVO damper with the offset cross tube welded on - not overly brilliant I´d say, the tube should really be on centerline of the piston rod, else you get that dreaded bending load on the rod and wrecked seals in there, and bad for the piston as well. Anyway, while having a job to be done on these items you better try best to care for these "side"effects in suspension or you will do same in short time again. As somebody said: Do it right or do it twice . . . . Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rear shock absorber alignment
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