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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: 78145" data-attributes="member: 597"><p>My guestimate is that the unladen bike ( for a twin) needs to have approximately not more than 200 Lb.'s of spring loading at rest. I proved this over the week end by installing one of my springs on one side rated at 50 Lb.'s with 2 inches of pre-load (100 lb.'s loading). And on the other, one of the 36 lb springs, which at 3 inches of pre-load is 108 lb.'s. At this set up the suspension was quite definitely "Topped out" Ok then I removed the 36 temporarily and cut 1 inch off its length (I'm getting pretty good at this) thus lowering the pre-load to 2 inches and a total of 172 Lb.'s combined. This now has the bike not topped out and after I sat on the machine the front shocker had used about 15 mm of travel. I also tried the two 33 lb. springs which seemed ok at first, but I found the front end would pretty much bottom out under hard braking, maybe ok on a single with light rider, I'm not sure. I don't feel that having the front end near topped out with the bike on its stand is a good idea, as it means the front end is going to hammer away at the shock absorber very time the front end becomes light over certain road conditions. I definitely feel that there is a limitation to how soft you can go, and slight variances of spring rates makes little to nil difference at all. The twins definitely reach a point where going too soft has no effect other than bottoming out. And the singles are much smoother which I guess is to be expected from their lighter weight. I had hoped to get my twin as "Soft a feel" as the singles, but after testing with numerous springs, this seems unlikely. But I will say that I am most happy now, and the spring set up I have is about as good as it gets from my testing. The only major change would be to go to a fully sprung rear seat, to maximize on the comfort at the rear. But that's another story. Cheers for now.............Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 78145, member: 597"] My guestimate is that the unladen bike ( for a twin) needs to have approximately not more than 200 Lb.'s of spring loading at rest. I proved this over the week end by installing one of my springs on one side rated at 50 Lb.'s with 2 inches of pre-load (100 lb.'s loading). And on the other, one of the 36 lb springs, which at 3 inches of pre-load is 108 lb.'s. At this set up the suspension was quite definitely "Topped out" Ok then I removed the 36 temporarily and cut 1 inch off its length (I'm getting pretty good at this) thus lowering the pre-load to 2 inches and a total of 172 Lb.'s combined. This now has the bike not topped out and after I sat on the machine the front shocker had used about 15 mm of travel. I also tried the two 33 lb. springs which seemed ok at first, but I found the front end would pretty much bottom out under hard braking, maybe ok on a single with light rider, I'm not sure. I don't feel that having the front end near topped out with the bike on its stand is a good idea, as it means the front end is going to hammer away at the shock absorber very time the front end becomes light over certain road conditions. I definitely feel that there is a limitation to how soft you can go, and slight variances of spring rates makes little to nil difference at all. The twins definitely reach a point where going too soft has no effect other than bottoming out. And the singles are much smoother which I guess is to be expected from their lighter weight. I had hoped to get my twin as "Soft a feel" as the singles, but after testing with numerous springs, this seems unlikely. But I will say that I am most happy now, and the spring set up I have is about as good as it gets from my testing. The only major change would be to go to a fully sprung rear seat, to maximize on the comfort at the rear. But that's another story. Cheers for now.............Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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