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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="greg brillus" data-source="post: 121496" data-attributes="member: 597"><p>Oh dear here we go again..........Ok the big difference between the Brampton's and Girdraulics is actually nothing........yes nothing..........The later factory design was to improve on the strength and total movement of the forks......... Yes they improved the strength and yes they improved the travel........now this later point is where they went wrong........They went wrong in using longer stiff springs, this single factor changed the link geometry to a condition where the forks basically "Over center"........to prove this point and that Brampton's can suffer the wobbles, look at some video's shown on this forum where a pre war twin is loaded to the max with pannier racks and luggage, then a rider of lighter weight takes off and the front end starts to weave left and right. I bet if you could see the links, they would be pointing down at the font.........This is the exact same condition that the Girdraulic's have from their outset. Take a nice open series "D" for a spin, lovely soft compliant suspension........Ok hit a few bumps in the road surface, not overly fast say 60 kph........now apply the front brakes and look down at the upper link and watch what happens to it..........All that lovely soft suspension suddenly stops. All you've got now is the side walls in your front tire....... So lowering the front using short springs works, but the stem mod returns the full travel and you can use special springs made specifically for it.........The shock absorber is not an issue, so long as it feels fine and has not leaked out t's oil........Yes do lubricate all the spindle bushes and spring box pivots......the friction in these front ends is really very high, and this adds to the problem overall. When I ride customers bikes now with a stock front end, I am very cautious, and reminded of how potentially dangerous they can be........Well I rode one the other day that had little or no brakes, so that was a good thing............. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="greg brillus, post: 121496, member: 597"] Oh dear here we go again..........Ok the big difference between the Brampton's and Girdraulics is actually nothing........yes nothing..........The later factory design was to improve on the strength and total movement of the forks......... Yes they improved the strength and yes they improved the travel........now this later point is where they went wrong........They went wrong in using longer stiff springs, this single factor changed the link geometry to a condition where the forks basically "Over center"........to prove this point and that Brampton's can suffer the wobbles, look at some video's shown on this forum where a pre war twin is loaded to the max with pannier racks and luggage, then a rider of lighter weight takes off and the front end starts to weave left and right. I bet if you could see the links, they would be pointing down at the font.........This is the exact same condition that the Girdraulic's have from their outset. Take a nice open series "D" for a spin, lovely soft compliant suspension........Ok hit a few bumps in the road surface, not overly fast say 60 kph........now apply the front brakes and look down at the upper link and watch what happens to it..........All that lovely soft suspension suddenly stops. All you've got now is the side walls in your front tire....... So lowering the front using short springs works, but the stem mod returns the full travel and you can use special springs made specifically for it.........The shock absorber is not an issue, so long as it feels fine and has not leaked out t's oil........Yes do lubricate all the spindle bushes and spring box pivots......the friction in these front ends is really very high, and this adds to the problem overall. When I ride customers bikes now with a stock front end, I am very cautious, and reminded of how potentially dangerous they can be........Well I rode one the other day that had little or no brakes, so that was a good thing............. ;) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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