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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="greg brillus" data-source="post: 78067" data-attributes="member: 597"><p>Ok getting back to the real world of testing..............Today I installed a pair of the 33 Lb springs that Norman sent me, as a bit of a trial to see if a slightly weaker spring could be used as opposed to the 36 lb springs that Chris has been using for a while (remember that I am around 72 kg's). Now the springs I removed were the ones I had made earlier, and rated at 40 lb's, though because I had chopped 3 inches off them, the actual spring rate was 50 Lb's. I know these spring rates because I am using a spare spring box assembly as a test bed using a set of scales, and I have drawn a line on the lower spring box with one inch markers on it. Ok so I installed the springs, sat the bike back on the ground, and the shocker unit was showing about 20% of travel used, so quite close to being topped out. Took the bike for a good test ride, lots of good bumps and so on, the suspension felt very good, and probably as light as I feel I would want to go. It did not bottom out over bumps, but if I gave the front brake a really good squeeze, I would say it is up against the bump stop on the Thornton shocker. I would say after these trials so far, that the same set up on a Comet is definitely a lot softer and smoother than a twin, and I can only say that it must be just the extra weight of the machine. I feel that I will either try the 36 lb springs or even go back to the original ones I had in there, which have a higher spring rate, but are shorter with about 2 inches of pre -load. So this is near concluding testing from my point of view, other than when installing the springs it seems best if when the bike is resting on its front wheel again, that the front end is at or very near topped out, as this will settle and give you as much travel as is available. In conclusion I would have to say that the 33 lb springs are probably near spot on for a single and the 36 lb springs for the twins, or a combination there of. Cheers........Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 78067, member: 597"] Ok getting back to the real world of testing..............Today I installed a pair of the 33 Lb springs that Norman sent me, as a bit of a trial to see if a slightly weaker spring could be used as opposed to the 36 lb springs that Chris has been using for a while (remember that I am around 72 kg's). Now the springs I removed were the ones I had made earlier, and rated at 40 lb's, though because I had chopped 3 inches off them, the actual spring rate was 50 Lb's. I know these spring rates because I am using a spare spring box assembly as a test bed using a set of scales, and I have drawn a line on the lower spring box with one inch markers on it. Ok so I installed the springs, sat the bike back on the ground, and the shocker unit was showing about 20% of travel used, so quite close to being topped out. Took the bike for a good test ride, lots of good bumps and so on, the suspension felt very good, and probably as light as I feel I would want to go. It did not bottom out over bumps, but if I gave the front brake a really good squeeze, I would say it is up against the bump stop on the Thornton shocker. I would say after these trials so far, that the same set up on a Comet is definitely a lot softer and smoother than a twin, and I can only say that it must be just the extra weight of the machine. I feel that I will either try the 36 lb springs or even go back to the original ones I had in there, which have a higher spring rate, but are shorter with about 2 inches of pre -load. So this is near concluding testing from my point of view, other than when installing the springs it seems best if when the bike is resting on its front wheel again, that the front end is at or very near topped out, as this will settle and give you as much travel as is available. In conclusion I would have to say that the 33 lb springs are probably near spot on for a single and the 36 lb springs for the twins, or a combination there of. Cheers........Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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