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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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<blockquote data-quote="Martyn Goodwin" data-source="post: 78241" data-attributes="member: 2433"><p>Before I embarked on this exercise the front end of my comet was very stiff, due in most part to crappy high friction setup of the Girduralics. I had replaced the springs in the bike when I got it (a set of 16 1/2 D springs) with a mixed set of David Dunfey springs in the hope of preventing a tank slapper. I used one each of Davids 14" springs, one 75 and the other 130 Lb/inch, no preload spacers.</p><p></p><p>Thanks to the super support of Greg Brillus, I transisioned my Comet to the new "John Emmanuel" Steering Head.</p><p></p><p>Dave, My Crash Test Rider, has just returned after another run on my Comet after the latest 'tweek'. On his first run, with a pair of 30 Lb/in, 16 1/2 long springs, dave who weighs in around the 75 Kg mark commented that the front end bottomed out 'with ease' .</p><p></p><p>Based on my observations to date I knew that the front suspension was in equlibrium with an upwards force of approx 210 Lb (thats where it settles on static sag). I also knew that the pair of 30 Lb/in springs provided an full deflection upward force of 345 Lb, while Davids set up gave 615 Lbs. So I set about trying for a sag point between 25 and 30% and full deflection force mid way between the two earlier settings - around 450 Lb</p><p></p><p>I changed the springs using what I could find in my 'parts bin' and ended up with the sag point at 25% of travel and a full deflection force of 446 Lb. </p><p></p><p>Dave today reckongs Its been nailed - spot on. </p><p></p><p>He tells me that today he hit a few solid bumps but at no time did it feel that the suspension bottomed out. On subsequent examination we could see that it did actually bottom onto the bump rubber but with insifficient force to press that rubber over the shaft securing nut. (Thornton front )</p><p></p><p>In the right leg spring box I now have a 75 Lb/in spring, 14 inches free length plus a 3/4" spacer. In the left leg spring box I have a 30 Lb/in, 16 1/2 ling spring and NO preload spacer.</p><p></p><p>I am busting to get clearance to get on the bike myself - the medico's tell me it should be in around 2 weeks time!</p><p></p><p>Martyn</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 78241, member: 2433"] Before I embarked on this exercise the front end of my comet was very stiff, due in most part to crappy high friction setup of the Girduralics. I had replaced the springs in the bike when I got it (a set of 16 1/2 D springs) with a mixed set of David Dunfey springs in the hope of preventing a tank slapper. I used one each of Davids 14" springs, one 75 and the other 130 Lb/inch, no preload spacers. Thanks to the super support of Greg Brillus, I transisioned my Comet to the new "John Emmanuel" Steering Head. Dave, My Crash Test Rider, has just returned after another run on my Comet after the latest 'tweek'. On his first run, with a pair of 30 Lb/in, 16 1/2 long springs, dave who weighs in around the 75 Kg mark commented that the front end bottomed out 'with ease' . Based on my observations to date I knew that the front suspension was in equlibrium with an upwards force of approx 210 Lb (thats where it settles on static sag). I also knew that the pair of 30 Lb/in springs provided an full deflection upward force of 345 Lb, while Davids set up gave 615 Lbs. So I set about trying for a sag point between 25 and 30% and full deflection force mid way between the two earlier settings - around 450 Lb I changed the springs using what I could find in my 'parts bin' and ended up with the sag point at 25% of travel and a full deflection force of 446 Lb. Dave today reckongs Its been nailed - spot on. He tells me that today he hit a few solid bumps but at no time did it feel that the suspension bottomed out. On subsequent examination we could see that it did actually bottom onto the bump rubber but with insifficient force to press that rubber over the shaft securing nut. (Thornton front ) In the right leg spring box I now have a 75 Lb/in spring, 14 inches free length plus a 3/4" spacer. In the left leg spring box I have a 30 Lb/in, 16 1/2 ling spring and NO preload spacer. I am busting to get clearance to get on the bike myself - the medico's tell me it should be in around 2 weeks time! Martyn [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modified Steering Stem
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