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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: 98612" data-attributes="member: 1177"><p>Very nice summary Eddy. When I was shortening Thornton springs which were 17" long and had a wire diameter of .177" they tended to rise 5 lbs. for every inch of spring I cut off. It was a 50 lbs. rate spring. When cut to 14 " they went up to 63 lbs. At 13' they were 67.25 lbs and at 12 they were about 75 lbs. It is difficult to cut much off before you stiffen things up a lot.</p><p></p><p>The white 130 sidecar springs coil bound at 9.3" out of the total of 14". The lighter 14" springs would coil bind at a lower height. Your results will probably vary a lot. I am surprised that anyone would have to cut down the spring boxes. The Works Performance damper has 2.85" of free movement and is supposed to get another .25" of movement into the rubber snubber for a total of 3.10". Having said all this I would follow Norman's advice as he is much closer to what is going on.</p><p></p><p>The Koni dampers were always wildly stiff. Bill's 30 year old konis should be perfect in just a few years and I know he will be enjoying them!</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 98612, member: 1177"] Very nice summary Eddy. When I was shortening Thornton springs which were 17" long and had a wire diameter of .177" they tended to rise 5 lbs. for every inch of spring I cut off. It was a 50 lbs. rate spring. When cut to 14 " they went up to 63 lbs. At 13' they were 67.25 lbs and at 12 they were about 75 lbs. It is difficult to cut much off before you stiffen things up a lot. The white 130 sidecar springs coil bound at 9.3" out of the total of 14". The lighter 14" springs would coil bind at a lower height. Your results will probably vary a lot. I am surprised that anyone would have to cut down the spring boxes. The Works Performance damper has 2.85" of free movement and is supposed to get another .25" of movement into the rubber snubber for a total of 3.10". Having said all this I would follow Norman's advice as he is much closer to what is going on. The Koni dampers were always wildly stiff. Bill's 30 year old konis should be perfect in just a few years and I know he will be enjoying them! David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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