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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Prototype of new AVO coilover for Series ‘D’ Vincents
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<blockquote data-quote="timetraveller" data-source="post: 97988" data-attributes="member: 456"><p>A few comments here and thanks for organising these new dampers. I wonder about the comments that the 'D' ride height is high. I don't think so and I am only 5'8". It is true that when the bike is on the centre stand there is a lot of height but there is also a lot of movement. My recollection is that there was intended to be about 7" of movement on the rear wheel, and like with the 'B's and 'C's, with a lot less potential movement, a lot of this was taken up by the rider sitting on the bike. When seated I never felt that I could not reach the floor. The adjustable pre-load with the new AVO damper will presumably take up some of that original movement caused by the rider loading. The way that I always check the springing on a 'D' is to have the bike on its wheels and then press down repeatedly on the front of the seat, roughly where one's behind would be when seated. The bike should more or less float up and down with equal movement on the front and the rear. I cannot quite imagine what is going to happen when the rear suspension is pre-loaded. Will the potential over movement, that which is normally provided by the rider's weight , be mimicked by the pre-load or not. It is going to be very interesting to see what happens on the road tests. Modern dampers are so much better than those of 64 years ago that there is real potential for improvement and we should thank hadronuk for his efforts here.</p><p>I cannot find the rate of the 'D' rear spring but I do know that a lot of riders fitted the sidecar version of the spring for use when the machine was used solo. The pre-load might take care of that. Once again the final tweaking can be done on the back of test rides.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 97988, member: 456"] A few comments here and thanks for organising these new dampers. I wonder about the comments that the 'D' ride height is high. I don't think so and I am only 5'8". It is true that when the bike is on the centre stand there is a lot of height but there is also a lot of movement. My recollection is that there was intended to be about 7" of movement on the rear wheel, and like with the 'B's and 'C's, with a lot less potential movement, a lot of this was taken up by the rider sitting on the bike. When seated I never felt that I could not reach the floor. The adjustable pre-load with the new AVO damper will presumably take up some of that original movement caused by the rider loading. The way that I always check the springing on a 'D' is to have the bike on its wheels and then press down repeatedly on the front of the seat, roughly where one's behind would be when seated. The bike should more or less float up and down with equal movement on the front and the rear. I cannot quite imagine what is going to happen when the rear suspension is pre-loaded. Will the potential over movement, that which is normally provided by the rider's weight , be mimicked by the pre-load or not. It is going to be very interesting to see what happens on the road tests. Modern dampers are so much better than those of 64 years ago that there is real potential for improvement and we should thank hadronuk for his efforts here. I cannot find the rate of the 'D' rear spring but I do know that a lot of riders fitted the sidecar version of the spring for use when the machine was used solo. The pre-load might take care of that. Once again the final tweaking can be done on the back of test rides. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Prototype of new AVO coilover for Series ‘D’ Vincents
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