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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Front end damping
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<blockquote data-quote="peterg" data-source="post: 12466" data-attributes="member: 446"><p>Howdy Mick,</p><p> </p><p>Are your sure the shock was indeed bottoming as opposed to just going almost rigid and the shock bushings pounding the top or bottom securing bolts or the eye bolts slackened off on their perches? I just returned from several hundred miles on the Shadow, two up at 390lbs, on expansionstripped and (excitingly on occassion) potholed roads up North and the only sensation oft repeated at the front on abrupt bumps was reluctant fork travel compliance before seemingly going rigid and then the hop....</p><p> </p><p> </p><p>You have several scenarios for making a very firm unyielding ride at the front: 3.00x21 tire has little sidewall depth to yield as a springing medium, there's an awfull lot of unsprung mass to accelerate quickly on a girdraulic machine with cast iron shadow drums, and a rather unyielding vintage designed shock. You may have noticed when you stroke a stock unit - especially the front - that there is a dead space of compliance before (overly) firm dampening commences (if you've observed this bled into a clear graduated cylinder, a stroke accompanied by an incedible amount of frothing - don't expect the same results twice). </p><p> </p><p>Know Thy Beast (I think) provides a section of aiding fluid distribution in both jounce and rebound to mitigate this characteristic which it does to a degree. I mod'd accordingly and then started at 20wt and worked down to 5wt oil on the Red Rap to at least have a transition. The outcome is a nice floaty feel with entertaining rise and fall of yokes under acceleration/decel with some semblance of dampening no doubt aided by running my front 3.50x19 at only 26psi. Semi suitable for a dignified fat tired touring rap spec machine, but not at all in keeping with the Shadow's MO.</p><p> </p><p>I have not dissembled and performed same mods with the later VOCS stock units fitted to that machine but will drain off and fit first, ATF and then Penske 0 Weight shock oil No great expectations, unlike the true road warriors here abouts, I'm just looking to preserve the true vintage Vin riding experience...but with some degree of safety and without concern of squirting my spindle bushings out each side when pounding an unavoidable crevice in the road.</p></blockquote><p></p>
[QUOTE="peterg, post: 12466, member: 446"] Howdy Mick, Are your sure the shock was indeed bottoming as opposed to just going almost rigid and the shock bushings pounding the top or bottom securing bolts or the eye bolts slackened off on their perches? I just returned from several hundred miles on the Shadow, two up at 390lbs, on expansionstripped and (excitingly on occassion) potholed roads up North and the only sensation oft repeated at the front on abrupt bumps was reluctant fork travel compliance before seemingly going rigid and then the hop.... You have several scenarios for making a very firm unyielding ride at the front: 3.00x21 tire has little sidewall depth to yield as a springing medium, there's an awfull lot of unsprung mass to accelerate quickly on a girdraulic machine with cast iron shadow drums, and a rather unyielding vintage designed shock. You may have noticed when you stroke a stock unit - especially the front - that there is a dead space of compliance before (overly) firm dampening commences (if you've observed this bled into a clear graduated cylinder, a stroke accompanied by an incedible amount of frothing - don't expect the same results twice). Know Thy Beast (I think) provides a section of aiding fluid distribution in both jounce and rebound to mitigate this characteristic which it does to a degree. I mod'd accordingly and then started at 20wt and worked down to 5wt oil on the Red Rap to at least have a transition. The outcome is a nice floaty feel with entertaining rise and fall of yokes under acceleration/decel with some semblance of dampening no doubt aided by running my front 3.50x19 at only 26psi. Semi suitable for a dignified fat tired touring rap spec machine, but not at all in keeping with the Shadow's MO. I have not dissembled and performed same mods with the later VOCS stock units fitted to that machine but will drain off and fit first, ATF and then Penske 0 Weight shock oil No great expectations, unlike the true road warriors here abouts, I'm just looking to preserve the true vintage Vin riding experience...but with some degree of safety and without concern of squirting my spindle bushings out each side when pounding an unavoidable crevice in the road. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Front end damping
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