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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: 78048" data-attributes="member: 1177"><p>I am all for on road testing and that is what Martyn is reporting on. It will be good to get more information from others. </p><p></p><p>For my own testing, I concluded that adjustable preload was mandatory. I felt that I needed to adjust the ride height to properly tune the bikes I was riding. I did this in a rather crude way by making the springs short so they could be shimmed up to a specific ride height that I felt worked. </p><p></p><p>I made spring limiters to make adjustments where I felt the the static sag (that is with a rider) was too great:</p><p>[ATTACH=full]15796[/ATTACH] </p><p>[ATTACH=full]15797[/ATTACH] </p><p>I made the limiters from scrap around the shop primarily for testing purposes. It allows you to turn the small nub inside the tube that is threaded to set the preload on the spring. I then put it in the press upside down to screw the cap on the end. As the spring compresses the rod moves inside the tube. As it extends, it can only extend as far as the rod will allow as the nub hits the shoulder of the hole that the threaded rod runs through.</p><p>[ATTACH=full]15798[/ATTACH] </p><p>I have a 1/2" preload on the spring assembled above. This required a 1/2" spacer in the spring box to keep the spring in the spring boxes with no slack. This is a quick way of testing different preload settings. I never felt the need to use one other than for testing. If I were to use a permanent one I would make one to size and that worked more smoothly. </p><p></p><p>I think this could help with heavy loads where you want the same rate, but need a little more travel. It allows you to steal some travel out of the sag (assuming you have a lot of static sag) and put it in compression. Thus, it raises the laden ride height. Sometimes these small adjustments can make all the difference, although I have to admit, that the few who could have used these limiters were not interested. They were happy with the ride as it was with the bare springs.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 78048, member: 1177"] I am all for on road testing and that is what Martyn is reporting on. It will be good to get more information from others. For my own testing, I concluded that adjustable preload was mandatory. I felt that I needed to adjust the ride height to properly tune the bikes I was riding. I did this in a rather crude way by making the springs short so they could be shimmed up to a specific ride height that I felt worked. I made spring limiters to make adjustments where I felt the the static sag (that is with a rider) was too great: [ATTACH=full]15796[/ATTACH] [ATTACH=full]15797[/ATTACH] I made the limiters from scrap around the shop primarily for testing purposes. It allows you to turn the small nub inside the tube that is threaded to set the preload on the spring. I then put it in the press upside down to screw the cap on the end. As the spring compresses the rod moves inside the tube. As it extends, it can only extend as far as the rod will allow as the nub hits the shoulder of the hole that the threaded rod runs through. [ATTACH=full]15798[/ATTACH] I have a 1/2" preload on the spring assembled above. This required a 1/2" spacer in the spring box to keep the spring in the spring boxes with no slack. This is a quick way of testing different preload settings. I never felt the need to use one other than for testing. If I were to use a permanent one I would make one to size and that worked more smoothly. I think this could help with heavy loads where you want the same rate, but need a little more travel. It allows you to steal some travel out of the sag (assuming you have a lot of static sag) and put it in compression. Thus, it raises the laden ride height. Sometimes these small adjustments can make all the difference, although I have to admit, that the few who could have used these limiters were not interested. They were happy with the ride as it was with the bare springs. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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