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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="hadronuk" data-source="post: 103972" data-attributes="member: 1866"><p>As I have mentioned before, there is a DIY way to shorten a spring without cutting it.</p><p>As TT points out, chopping coils off will cause a presumably unwanted increase in spring rate, plus the cut end will not be correctly formed to sit square under load, even if ground accurately flat.</p><p></p><p>Method: Thread the spring onto some stout studding, then clamp it up solid with nuts and washers.</p><p>Heat a small area of the spring to the highest temperature you can achieve with a hot air gun.</p><p>Allow to completely cool (perhaps leave overnight), then unclamp and measure. If more shortening is required, repeat heating a different part of the spring. Only do a bit at a time, as over shortening is difficult to reverse.</p><p>Before doing this, it is highly recommended to count coils, calculate the solid length, then check the spring cannot become coil bound at full bump.</p><p>This may be a particular problem if you have replacement spring cases that have a much shorter spring space than they should have.</p><p>From memory, the original spring cases with an original Vincent damper fully extended will have a spring space (spring fitted length) of over 14 inches. Replacement cases can easily be 1/2" less than this.</p></blockquote><p></p>
[QUOTE="hadronuk, post: 103972, member: 1866"] As I have mentioned before, there is a DIY way to shorten a spring without cutting it. As TT points out, chopping coils off will cause a presumably unwanted increase in spring rate, plus the cut end will not be correctly formed to sit square under load, even if ground accurately flat. Method: Thread the spring onto some stout studding, then clamp it up solid with nuts and washers. Heat a small area of the spring to the highest temperature you can achieve with a hot air gun. Allow to completely cool (perhaps leave overnight), then unclamp and measure. If more shortening is required, repeat heating a different part of the spring. Only do a bit at a time, as over shortening is difficult to reverse. Before doing this, it is highly recommended to count coils, calculate the solid length, then check the spring cannot become coil bound at full bump. This may be a particular problem if you have replacement spring cases that have a much shorter spring space than they should have. From memory, the original spring cases with an original Vincent damper fully extended will have a spring space (spring fitted length) of over 14 inches. Replacement cases can easily be 1/2" less than this. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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