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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="davidd" data-source="post: 75543" data-attributes="member: 1177"><p>From memory the Thornton damper I tested had 2.85" of movement to the rubber snubber. The snubber could only yeild about .25" once it was contacted, so that would be the total travel. The damper was the intended limiter of the movement of the Girdraulic as far as I could devine.</p><p></p><p>Thornton originally instructed owners to have 30% sag, but later changed that to 50%. I was always puzzled by this because there is no physical way to adjust sag on a Vincent, which was why I opted to make shorter springs that could be adjusted up to set the sag. It has become easier to think of sag in terms of the angle of the bottom link when loaded. Of course, the new steering stem positions the back of the lower link, that is the end with the large eyes, lower, making the back of the lower link resist rotating over the front spindle during braking. I would think that the new soft springs should err on the side of being shorter rather than longer for the same reason. Spacers can always be added. I chose 14" for the distance between spring platforms in the spring boxes, but I found it varied on different bikes. I think I measured 15 inches on a D once. </p><p></p><p>Thornton also recommended that the short eyes be used on the lower link to hold the damper due to the damper's longer reach than the Armstrong. Greg was aware of this, but it does not seem to be an issue with the new stem. It will be interesting to see if the longer eyes prove to be more useful with the new stem or if they both might be used for some fine tuning of the ride height or damper throws. </p><p></p><p>Thanks to Greg, Norman and Chris for doing all the juggling!</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 75543, member: 1177"] From memory the Thornton damper I tested had 2.85" of movement to the rubber snubber. The snubber could only yeild about .25" once it was contacted, so that would be the total travel. The damper was the intended limiter of the movement of the Girdraulic as far as I could devine. Thornton originally instructed owners to have 30% sag, but later changed that to 50%. I was always puzzled by this because there is no physical way to adjust sag on a Vincent, which was why I opted to make shorter springs that could be adjusted up to set the sag. It has become easier to think of sag in terms of the angle of the bottom link when loaded. Of course, the new steering stem positions the back of the lower link, that is the end with the large eyes, lower, making the back of the lower link resist rotating over the front spindle during braking. I would think that the new soft springs should err on the side of being shorter rather than longer for the same reason. Spacers can always be added. I chose 14" for the distance between spring platforms in the spring boxes, but I found it varied on different bikes. I think I measured 15 inches on a D once. Thornton also recommended that the short eyes be used on the lower link to hold the damper due to the damper's longer reach than the Armstrong. Greg was aware of this, but it does not seem to be an issue with the new stem. It will be interesting to see if the longer eyes prove to be more useful with the new stem or if they both might be used for some fine tuning of the ride height or damper throws. Thanks to Greg, Norman and Chris for doing all the juggling! David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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