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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="timetraveller" data-source="post: 75832" data-attributes="member: 456"><p>I was in touch with John only a week or so ago. He does not know what strength springs he used. He had a large number made and then kept experimenting until it felt about right. He tried a Thornton damper front and rear. He found that the rear one did not work at all when it was at the angle which it would be when on the bike. He showed it to me years ago and it was fine when upright and hopeless when horizontal. I assume that they are not all like that or someone would have complained by now. He eventually had a very special damper made for the front which was longer than standard and which required an outrigger bracket suspended from the lower link in order for it to fit. He believes that this was a waste of time and money and that the Thornton on the front was good enough. He has now lent me his Thornton and it is much softer than the AVO. When new, the AVO is very difficult to move by hand whereas the Thornton, which now has some play in it, is just about the same as my 60 years old Armstrong. John is worried that the handling will be worsened by using a 'stiff' damper but Chris' experience does not back this up. It is at this stage that I admit that I do not understand damping and am prepared to believe real world experience on the bike rather than pumping the things up and down by hand. Both the original Vincent and the Armstrong seem to have the same resistance in the compression and extension phases, which cannot be right by modern standards. This is also true of the Thornton which John has lent me but when that is moved in and out there is a definite 'squidging' sound of fluid moving about and when fully compressed it then pushes itself open as there is something inside creating a gas pressure. I do not know whether this is intentional or due to air leaking into it with use. For the rear John used long springs and had a very special and expensive damper made which, if I have understood correctly, could be adjusted for both the compression and extension strokes as well as a third adjustment for something else. I'm not sure what. He believes that the rear modification was very worth while.</p><p>John contacted me a while ago, worried that I was not warning people that with the new steering head the front mudguard could move so far backwards and upwards that it could hit the front cylinder head. This has not proved to be a problem so far with any of the road users who have fitted this modification so where the difference lies I do not know. He is also worried the there is now so much movement at the top of the fork legs that the control cables, brake, clutch, valve lifter etc. might have to be repositioned rearwards. As no one has mentioned this I assume that it turns out not to be a problem for most people. Sorry that there is not more information but you now have all that I have.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 75832, member: 456"] I was in touch with John only a week or so ago. He does not know what strength springs he used. He had a large number made and then kept experimenting until it felt about right. He tried a Thornton damper front and rear. He found that the rear one did not work at all when it was at the angle which it would be when on the bike. He showed it to me years ago and it was fine when upright and hopeless when horizontal. I assume that they are not all like that or someone would have complained by now. He eventually had a very special damper made for the front which was longer than standard and which required an outrigger bracket suspended from the lower link in order for it to fit. He believes that this was a waste of time and money and that the Thornton on the front was good enough. He has now lent me his Thornton and it is much softer than the AVO. When new, the AVO is very difficult to move by hand whereas the Thornton, which now has some play in it, is just about the same as my 60 years old Armstrong. John is worried that the handling will be worsened by using a 'stiff' damper but Chris' experience does not back this up. It is at this stage that I admit that I do not understand damping and am prepared to believe real world experience on the bike rather than pumping the things up and down by hand. Both the original Vincent and the Armstrong seem to have the same resistance in the compression and extension phases, which cannot be right by modern standards. This is also true of the Thornton which John has lent me but when that is moved in and out there is a definite 'squidging' sound of fluid moving about and when fully compressed it then pushes itself open as there is something inside creating a gas pressure. I do not know whether this is intentional or due to air leaking into it with use. For the rear John used long springs and had a very special and expensive damper made which, if I have understood correctly, could be adjusted for both the compression and extension strokes as well as a third adjustment for something else. I'm not sure what. He believes that the rear modification was very worth while. John contacted me a while ago, worried that I was not warning people that with the new steering head the front mudguard could move so far backwards and upwards that it could hit the front cylinder head. This has not proved to be a problem so far with any of the road users who have fitted this modification so where the difference lies I do not know. He is also worried the there is now so much movement at the top of the fork legs that the control cables, brake, clutch, valve lifter etc. might have to be repositioned rearwards. As no one has mentioned this I assume that it turns out not to be a problem for most people. Sorry that there is not more information but you now have all that I have. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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